Binder クラス
メンバの候補リストからメンバを選択し、実引数の型から仮引数の型への型変換を実行します。 名前空間: System.Reflection
アセンブリ: mscorlib (mscorlib.dll 内)
構文
解説
使用例
継承階層
スレッド セーフ
プラットフォーム
バージョン情報
参照
アセンブリ: mscorlib (mscorlib.dll 内)
構文<SerializableAttribute> _ <ClassInterfaceAttribute(ClassInterfaceType.AutoDual)> _ <ComVisibleAttribute(True)> _ Public MustInherit Class Binder
[SerializableAttribute] [ClassInterfaceAttribute(ClassInterfaceType.AutoDual)] [ComVisibleAttribute(true)] public abstract class Binder
[SerializableAttribute] [ClassInterfaceAttribute(ClassInterfaceType::AutoDual)] [ComVisibleAttribute(true)] public ref class Binder abstract
解説 継承時の注意 Binder から継承する場合、BindToMethod、BindToField、SelectMethod、SelectProperty、ChangeType の各メンバをオーバーライドする必要があります。
使用例Binder クラスのすべてのメンバを実装して使用する例を次に示します。プライベート メソッド CanConvertFrom を使用して、指定した型と互換性がある型を検索します。
Imports System Imports System.Reflection Imports System.Globalization Imports Microsoft.VisualBasic Public Class MyBinder Inherits Binder Public Sub New() MyBase.new() End Sub 'New Private Class BinderState Public args() As Object End Class 'BinderState Public Overrides Function BindToField(ByVal bindingAttr As BindingFlags, ByVal match() As FieldInfo, ByVal value As Object, ByVal culture As CultureInfo) As FieldInfo If match Is Nothing Then Throw New ArgumentNullException("match") End If ' Get a field for which the value parameter can be converted to the specified field type. Dim i As Integer For i = 0 To match.Length - 1 If Not (ChangeType(value, match(i).FieldType, culture) Is Nothing) Then Return match(i) End If Next i Return Nothing End Function 'BindToField Public Overrides Function BindToMethod(ByVal bindingAttr As BindingFlags, ByVal match() As MethodBase, ByRef args() As Object, ByVal modifiers() As ParameterModifier, ByVal culture As CultureInfo, ByVal names() As String, ByRef state As Object) As MethodBase ' Store the arguments to the method in a state object. Dim myBinderState As New BinderState() Dim arguments() As Object = New [Object](args.Length) {} args.CopyTo(arguments, 0) myBinderState.args = arguments state = myBinderState If match Is Nothing Then Throw New ArgumentNullException() End If ' Find a method that has the same parameters as those of args. Dim i As Integer For i = 0 To match.Length - 1 ' Count the number of parameters that match. Dim count As Integer = 0 Dim parameters As ParameterInfo() = match(i).GetParameters() ' Go on to the next method if the number of parameters do not match. If args.Length <> parameters.Length Then GoTo ContinueFori End If ' Match each of the parameters that the user expects the method to have. Dim j As Integer For j = 0 To args.Length - 1 ' If names is not null, then reorder args. If Not (names Is Nothing) Then If names.Length <> args.Length Then Throw New ArgumentException("names and args must have the same number of elements.") End If Dim k As Integer For k = 0 To names.Length - 1 If String.Compare(parameters(j).Name, names(k).ToString()) = 0 Then args(j) = myBinderState.args(k) End If Next k End If ' Determine whether the types specified by the user can be converted to parameter type. If Not (ChangeType(args(j), parameters(j).ParameterType, culture) Is Nothing) Then count += 1 Else Exit For End If Next j ' Determine whether the method has been found. If count = args.Length Then Return match(i) End If ContinueFori: Next i Return Nothing End Function 'BindToMethod Public Overrides Function ChangeType(ByVal value As Object, ByVal myChangeType As Type, ByVal culture As CultureInfo) As Object ' Determine whether the value parameter can be converted to a value of type myType. If CanConvertFrom(value.GetType(), myChangeType) Then ' Return the converted object. Return Convert.ChangeType(value, myChangeType) ' Return null. Else Return Nothing End If End Function 'ChangeType Public Overrides Sub ReorderArgumentArray(ByRef args() As Object, ByVal state As Object) 'Redimension the array to hold the state values. ReDim args(CType(state, BinderState).args.Length) ' Return the args that had been reordered by BindToMethod. CType(state, BinderState).args.CopyTo(args, 0) End Sub 'ReorderArgumentArray Public Overrides Function SelectMethod(ByVal bindingAttr As BindingFlags, ByVal match() As MethodBase, ByVal types() As Type, ByVal modifiers() As ParameterModifier) As MethodBase If match Is Nothing Then Throw New ArgumentNullException("match") End If Dim i As Integer For i = 0 To match.Length - 1 ' Count the number of parameters that match. Dim count As Integer = 0 Dim parameters As ParameterInfo() = match(i).GetParameters() ' Go on to the next method if the number of parameters do not match. If types.Length <> parameters.Length Then GoTo ContinueFori End If ' Match each of the parameters that the user expects the method to have. Dim j As Integer For j = 0 To types.Length - 1 ' Determine whether the types specified by the user can be converted to parameter type. If CanConvertFrom(types(j), parameters(j).ParameterType) Then count += 1 Else Exit For End If Next j ' Determine whether the method has been found. If count = types.Length Then Return match(i) End If ContinueFori: Next i Return Nothing End Function 'SelectMethod Public Overrides Function SelectProperty(ByVal bindingAttr As BindingFlags, ByVal match() As PropertyInfo, ByVal returnType As Type, ByVal indexes() As Type, ByVal modifiers() As ParameterModifier) As PropertyInfo If match Is Nothing Then Throw New ArgumentNullException("match") End If Dim i As Integer For i = 0 To match.Length - 1 ' Count the number of indexes that match. Dim count As Integer = 0 Dim parameters As ParameterInfo() = match(i).GetIndexParameters() ' Go on to the next property if the number of indexes do not match. If indexes.Length <> parameters.Length Then GoTo ContinueFori End If ' Match each of the indexes that the user expects the property to have. Dim j As Integer For j = 0 To indexes.Length - 1 ' Determine whether the types specified by the user can be converted to index type. If CanConvertFrom(indexes(j), parameters(j).ParameterType) Then count += 1 Else Exit For End If Next j ' Determine whether the property has been found. If count = indexes.Length Then ' Determine whether the return type can be converted to the properties type. If CanConvertFrom(returnType, match(i).GetType()) Then Return match(i) Else GoTo ContinueFori End If End If ContinueFori: Next i Return Nothing End Function 'SelectProperty ' Determine whether type1 can be converted to type2. Check only for primitive types. Private Function CanConvertFrom(ByVal type1 As Type, ByVal type2 As Type) As Boolean If type1.IsPrimitive And type2.IsPrimitive Then Dim typeCode1 As TypeCode = Type.GetTypeCode(type1) Dim typeCode2 As TypeCode = Type.GetTypeCode(type2) ' If both type1 and type2 have same type, return true. If typeCode1 = typeCode2 Then Return True End If ' Possible conversions from Char follow. If typeCode1 = TypeCode.Char Then Select Case typeCode2 Case TypeCode.UInt16 Return True Case TypeCode.UInt32 Return True Case TypeCode.Int32 Return True Case TypeCode.UInt64 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from Byte follow. If typeCode1 = TypeCode.Byte Then Select Case typeCode2 Case TypeCode.Char Return True Case TypeCode.UInt16 Return True Case TypeCode.Int16 Return True Case TypeCode.UInt32 Return True Case TypeCode.Int32 Return True Case TypeCode.UInt64 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from SByte follow. If typeCode1 = TypeCode.SByte Then Select Case typeCode2 Case TypeCode.Int16 Return True Case TypeCode.Int32 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from UInt16 follow. If typeCode1 = TypeCode.UInt16 Then Select Case typeCode2 Case TypeCode.UInt32 Return True Case TypeCode.Int32 Return True Case TypeCode.UInt64 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from Int16 follow. If typeCode1 = TypeCode.Int16 Then Select Case typeCode2 Case TypeCode.Int32 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from UInt32 follow. If typeCode1 = TypeCode.UInt32 Then Select Case typeCode2 Case TypeCode.UInt64 Return True Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from Int32 follow. If typeCode1 = TypeCode.Int32 Then Select Case typeCode2 Case TypeCode.Int64 Return True Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from UInt64 follow. If typeCode1 = TypeCode.UInt64 Then Select Case typeCode2 Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from Int64 follow. If typeCode1 = TypeCode.Int64 Then Select Case typeCode2 Case TypeCode.Single Return True Case TypeCode.Double Return True Case Else Return False End Select End If ' Possible conversions from Single follow. If typeCode1 = TypeCode.Single Then Select Case typeCode2 Case TypeCode.Double Return True Case Else Return False End Select End If End If Return False End Function 'CanConvertFrom End Class 'MyBinder Public Class MyClass1 Public myFieldB As Short Public myFieldA As Integer Public Overloads Sub MyMethod(ByVal i As Long, ByVal k As Char) Console.WriteLine(ControlChars.NewLine & "This is MyMethod(long i, char k).") End Sub 'MyMethod Public Overloads Sub MyMethod(ByVal i As Long, ByVal j As Long) Console.WriteLine(ControlChars.NewLine & "This is MyMethod(long i, long j).") End Sub 'MyMethod End Class 'MyClass1 Public Class Binder_Example Public Shared Sub Main() ' Get the type of MyClass1. Dim myType As Type = GetType(MyClass1) ' Get the instance of MyClass1. Dim myInstance As New MyClass1() Console.WriteLine(ControlChars.Cr & "Displaying the results of using the MyBinder binder.") Console.WriteLine() ' Get the method information for MyMethod. Dim myMethod As MethodInfo = myType.GetMethod("MyMethod", BindingFlags.Public Or BindingFlags.Instance, New MyBinder(), New Type() {GetType(Short), GetType(Short)}, Nothing) Console.WriteLine(MyMethod) ' Invoke MyMethod. myMethod.Invoke(myInstance, BindingFlags.InvokeMethod, New MyBinder(), New [Object]() {CInt(32), CInt(32)}, CultureInfo.CurrentCulture) End Sub 'Main End Class 'Binder_Example
using System; using System.Reflection; using System.Globalization; public class MyBinder : Binder { public MyBinder() : base() { } private class BinderState { public object[] args; } public override FieldInfo BindToField( BindingFlags bindingAttr, FieldInfo[] match, object value, CultureInfo culture ) { if(match == null) throw new ArgumentNullException("match"); // Get a field for which the value parameter can be converted to the specified field type. for(int i = 0; i < match.Length; i++) if(ChangeType(value, match[i].FieldType, culture) != null) return match[i]; return null; } public override MethodBase BindToMethod( BindingFlags bindingAttr, MethodBase[] match, ref object[] args, ParameterModifier[] modifiers, CultureInfo culture, string[] names, out object state ) { // Store the arguments to the method in a state object. BinderState myBinderState = new BinderState(); object[] arguments = new Object[args.Length]; args.CopyTo(arguments, 0); myBinderState.args = arguments; state = myBinderState; if(match == null) throw new ArgumentNullException(); // Find a method that has the same parameters as those of the args parameter. for(int i = 0; i < match.Length; i++) { // Count the number of parameters that match. int count = 0; ParameterInfo[] parameters = match[i].GetParameters(); // Go on to the next method if the number of parameters do not match. if(args.Length != parameters.Length) continue; // Match each of the parameters that the user expects the method to have. for(int j = 0; j < args.Length; j++) { // If the names parameter is not null, then reorder args. if(names != null) { if(names.Length != args.Length) throw new ArgumentException("names and args must have the same number of elements."); for(int k = 0; k < names.Length; k++) if(String.Compare(parameters[j].Name, names[k].ToString()) == 0) args[j] = myBinderState.args[k]; } // Determine whether the types specified by the user can be converted to the parameter type. if(ChangeType(args[j], parameters[j].ParameterType, culture) != null) count += 1; else break; } // Determine whether the method has been found. if(count == args.Length) return match[i]; } return null; } public override object ChangeType( object value, Type myChangeType, CultureInfo culture ) { // Determine whether the value parameter can be converted to a value of type myType. if(CanConvertFrom(value.GetType(), myChangeType)) // Return the converted object. return Convert.ChangeType(value, myChangeType); else // Return null. return null; } public override void ReorderArgumentArray( ref object[] args, object state ) { // Return the args that had been reordered by BindToMethod. ((BinderState)state).args.CopyTo(args, 0); } public override MethodBase SelectMethod( BindingFlags bindingAttr, MethodBase[] match, Type[] types, ParameterModifier[] modifiers ) { if(match == null) throw new ArgumentNullException("match"); for(int i = 0; i < match.Length; i++) { // Count the number of parameters that match. int count = 0; ParameterInfo[] parameters = match[i].GetParameters(); // Go on to the next method if the number of parameters do not match. if(types.Length != parameters.Length) continue; // Match each of the parameters that the user expects the method to have. for(int j = 0; j < types.Length; j++) // Determine whether the types specified by the user can be converted to parameter type. if(CanConvertFrom(types[j], parameters[j].ParameterType)) count += 1; else break; // Determine whether the method has been found. if(count == types.Length) return match[i]; } return null; } public override PropertyInfo SelectProperty( BindingFlags bindingAttr, PropertyInfo[] match, Type returnType, Type[] indexes, ParameterModifier[] modifiers ) { if(match == null) throw new ArgumentNullException("match"); for(int i = 0; i < match.Length; i++) { // Count the number of indexes that match. int count = 0; ParameterInfo[] parameters = match[i].GetIndexParameters(); // Go on to the next property if the number of indexes do not match. if(indexes.Length != parameters.Length) continue; // Match each of the indexes that the user expects the property to have. for(int j = 0; j < indexes.Length; j++) // Determine whether the types specified by the user can be converted to index type. if(CanConvertFrom(indexes[j], parameters[j].ParameterType)) count += 1; else break; // Determine whether the property has been found. if(count == indexes.Length) // Determine whether the return type can be converted to the properties type. if(CanConvertFrom(returnType, match[i].GetType())) return match[i]; else continue; } return null; } // Determines whether type1 can be converted to type2. Check only for primitive types. private bool CanConvertFrom(Type type1, Type type2) { if(type1.IsPrimitive && type2.IsPrimitive) { TypeCode typeCode1 = Type.GetTypeCode(type1); TypeCode typeCode2 = Type.GetTypeCode(type2); // If both type1 and type2 have the same type, return true. if(typeCode1 == typeCode2) return true; // Possible conversions from Char follow. if(typeCode1 == TypeCode.Char) switch(typeCode2) { case TypeCode.UInt16 : return true; case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from Byte follow. if(typeCode1 == TypeCode.Byte) switch(typeCode2) { case TypeCode.Char : return true; case TypeCode.UInt16 : return true; case TypeCode.Int16 : return true; case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from SByte follow. if(typeCode1 == TypeCode.SByte) switch(typeCode2) { case TypeCode.Int16 : return true; case TypeCode.Int32 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from UInt16 follow. if(typeCode1 == TypeCode.UInt16) switch(typeCode2) { case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from Int16 follow. if(typeCode1 == TypeCode.Int16) switch(typeCode2) { case TypeCode.Int32 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from UInt32 follow. if(typeCode1 == TypeCode.UInt32) switch(typeCode2) { case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from Int32 follow. if(typeCode1 == TypeCode.Int32) switch(typeCode2) { case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from UInt64 follow. if(typeCode1 == TypeCode.UInt64) switch(typeCode2) { case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from Int64 follow. if(typeCode1 == TypeCode.Int64) switch(typeCode2) { case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } // Possible conversions from Single follow. if(typeCode1 == TypeCode.Single) switch(typeCode2) { case TypeCode.Double : return true; default : return false; } } return false; } } public class MyClass1 { public short myFieldB; public int myFieldA; public void MyMethod(long i, char k) { Console.WriteLine("\nThis is MyMethod(long i, char k)"); } public void MyMethod(long i, long j) { Console.WriteLine("\nThis is MyMethod(long i, long j)"); } } public class Binder_Example { public static void Main() { // Get the type of MyClass1. Type myType = typeof(MyClass1); // Get the instance of MyClass1. MyClass1 myInstance = new MyClass1(); Console.WriteLine("\nDisplaying the results of using the MyBinder binder.\n"); // Get the method information for MyMethod. MethodInfo myMethod = myType.GetMethod("MyMethod", BindingFlags.Public | BindingFlags.Instance, new MyBinder(), new Type[] {typeof(short), typeof(short)}, null); Console.WriteLine(myMethod); // Invoke MyMethod. myMethod.Invoke(myInstance, BindingFlags.InvokeMethod, new MyBinder(), new Object[] {(int)32, (int)32}, CultureInfo.CurrentCulture); } }
using namespace System; using namespace System::Reflection; using namespace System::Globalization; using namespace System::Runtime::InteropServices; public ref class MyBinder: public Binder { public: MyBinder() : Binder() {} private: ref class BinderState { public: array<Object^>^args; }; public: virtual FieldInfo^ BindToField( BindingFlags bindingAttr, array<FieldInfo^>^match, Object^ value, CultureInfo^ culture ) override { if ( match == nullptr ) throw gcnew ArgumentNullException( "match" ); // Get a field for which the value parameter can be converted to the specified field type. for ( int i = 0; i < match->Length; i++ ) if ( ChangeType( value, match[ i ]->FieldType, culture ) != nullptr ) return match[ i ]; return nullptr; } virtual MethodBase^ BindToMethod( BindingFlags bindingAttr, array<MethodBase^>^match, array<Object^>^%args, array<ParameterModifier>^ modifiers, CultureInfo^ culture, array<String^>^names, [Out]Object^% state ) override { // Store the arguments to the method in a state Object*. BinderState^ myBinderState = gcnew BinderState; array<Object^>^arguments = gcnew array<Object^>(args->Length); args->CopyTo( arguments, 0 ); myBinderState->args = arguments; state = myBinderState; if ( match == nullptr ) throw gcnew ArgumentNullException; // Find a method that has the same parameters as those of the args parameter. for ( int i = 0; i < match->Length; i++ ) { // Count the number of parameters that match. int count = 0; array<ParameterInfo^>^parameters = match[ i ]->GetParameters(); // Go on to the next method if the number of parameters do not match. if ( args->Length != parameters->Length ) continue; // Match each of the parameters that the user expects the method to have. for ( int j = 0; j < args->Length; j++ ) { // If the names parameter is not 0, then reorder args. if ( names != nullptr ) { if ( names->Length != args->Length ) throw gcnew ArgumentException( "names and args must have the same number of elements." ); for ( int k = 0; k < names->Length; k++ ) if ( String::Compare( parameters[ j ]->Name, names[ k ] ) == 0 ) args[ j ] = myBinderState->args[ k ]; } // Determine whether the types specified by the user can be converted to the parameter type. if ( ChangeType( args[ j ], parameters[ j ]->ParameterType, culture ) != nullptr ) count += 1; else break; } if ( count == args->Length ) return match[ i ]; } return nullptr; } virtual Object^ ChangeType( Object^ value, Type^ myChangeType, CultureInfo^ culture ) override { // Determine whether the value parameter can be converted to a value of type myType. if ( CanConvertFrom( value->GetType(), myChangeType ) ) // Return the converted Object*. return Convert::ChangeType( value, myChangeType ); // Return 0. else 0; } virtual void ReorderArgumentArray( array<Object^>^%args, Object^ state ) override { // Return the args that had been reordered by BindToMethod. (safe_cast<BinderState^>(state))->args->CopyTo( args, 0 ); } virtual MethodBase^ SelectMethod( BindingFlags bindingAttr, array<MethodBase^>^match, array<Type^>^types, array<ParameterModifier>^ modifiers ) override { if ( match == nullptr ) throw gcnew ArgumentNullException( "match" ); for ( int i = 0; i < match->Length; i++ ) { // Count the number of parameters that match. int count = 0; array<ParameterInfo^>^parameters = match[ i ]->GetParameters(); // Go on to the next method if the number of parameters do not match. if ( types->Length != parameters->Length ) continue; // Match each of the parameters that the user expects the method to have. for ( int j = 0; j < types->Length; j++ ) // Determine whether the types specified by the user can be converted to parameter type. if ( CanConvertFrom( types[ j ], parameters[ j ]->ParameterType ) ) count += 1; else break; // Determine whether the method has been found. if ( count == types->Length ) return match[ i ]; } return nullptr; } virtual PropertyInfo^ SelectProperty( BindingFlags bindingAttr, array<PropertyInfo^>^match, Type^ returnType, array<Type^>^indexes, array<ParameterModifier>^ modifiers ) override { if ( match == nullptr ) throw gcnew ArgumentNullException( "match" ); for ( int i = 0; i < match->Length; i++ ) { // Count the number of indexes that match. int count = 0; array<ParameterInfo^>^parameters = match[ i ]->GetIndexParameters(); // Go on to the next property if the number of indexes do not match. if ( indexes->Length != parameters->Length ) continue; // Match each of the indexes that the user expects the property to have. for ( int j = 0; j < indexes->Length; j++ ) // Determine whether the types specified by the user can be converted to index type. if ( CanConvertFrom( indexes[ j ], parameters[ j ]->ParameterType ) ) count += 1; else break; // Determine whether the property has been found. if ( count == indexes->Length ) // Determine whether the return type can be converted to the properties type. if ( CanConvertFrom( returnType, match[ i ]->GetType() ) ) return match[ i ]; else continue; } return nullptr; } private: // Determines whether type1 can be converted to type2. Check only for primitive types. bool CanConvertFrom( Type^ type1, Type^ type2 ) { if ( type1->IsPrimitive && type2->IsPrimitive ) { TypeCode typeCode1 = Type::GetTypeCode( type1 ); TypeCode typeCode2 = Type::GetTypeCode( type2 ); // If both type1 and type2 have the same type, return true. if ( typeCode1 == typeCode2 ) return true; // Possible conversions from Char follow. if ( typeCode1 == TypeCode::Char ) { switch ( typeCode2 ) { case TypeCode::UInt16: return true; case TypeCode::UInt32: return true; case TypeCode::Int32: return true; case TypeCode::UInt64: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from Byte follow. if ( typeCode1 == TypeCode::Byte ) { switch ( typeCode2 ) { case TypeCode::Char: return true; case TypeCode::UInt16: return true; case TypeCode::Int16: return true; case TypeCode::UInt32: return true; case TypeCode::Int32: return true; case TypeCode::UInt64: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from SByte follow. if ( typeCode1 == TypeCode::SByte ) { switch ( typeCode2 ) { case TypeCode::Int16: return true; case TypeCode::Int32: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from UInt16 follow. if ( typeCode1 == TypeCode::UInt16 ) { switch ( typeCode2 ) { case TypeCode::UInt32: return true; case TypeCode::Int32: return true; case TypeCode::UInt64: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from Int16 follow. if ( typeCode1 == TypeCode::Int16 ) { switch ( typeCode2 ) { case TypeCode::Int32: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from UInt32 follow. if ( typeCode1 == TypeCode::UInt32 ) { switch ( typeCode2 ) { case TypeCode::UInt64: return true; case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from Int32 follow. if ( typeCode1 == TypeCode::Int32 ) { switch ( typeCode2 ) { case TypeCode::Int64: return true; case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from UInt64 follow. if ( typeCode1 == TypeCode::UInt64 ) { switch ( typeCode2 ) { case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from Int64 follow. if ( typeCode1 == TypeCode::Int64 ) { switch ( typeCode2 ) { case TypeCode::Single: return true; case TypeCode::Double: return true; default: return false; } } // Possible conversions from Single follow. if ( typeCode1 == TypeCode::Single ) { switch ( typeCode2 ) { case TypeCode::Double: return true; default: return false; } } } return false; } }; public ref class MyClass1 { public: short myFieldB; int myFieldA; void MyMethod( long i, char k ) { Console::WriteLine( "\nThis is MyMethod(long i, char k)" ); } void MyMethod( long i, long j ) { Console::WriteLine( "\nThis is MyMethod(long i, long j)" ); } }; int main() { // Get the type of MyClass1. Type^ myType = MyClass1::typeid; // Get the instance of MyClass1. MyClass1^ myInstance = gcnew MyClass1; Console::WriteLine( "\nDisplaying the results of using the MyBinder binder.\n" ); // Get the method information for MyMethod. array<Type^>^types = {short::typeid,short::typeid}; MethodInfo^ myMethod = myType->GetMethod( "MyMethod", static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance), gcnew MyBinder, types, nullptr ); Console::WriteLine( myMethod ); // Invoke MyMethod. array<Object^>^obj = {32,32}; myMethod->Invoke( myInstance, BindingFlags::InvokeMethod, gcnew MyBinder, obj, CultureInfo::CurrentCulture ); }
import System.*; import System.Reflection.*; import System.Globalization.*; public class MyBinder extends Binder { public MyBinder() { } //MyBinder private class BinderState { public Object args[]; } //BinderState public FieldInfo BindToField(BindingFlags bindingAttr, FieldInfo match[], Object value, CultureInfo culture) { if (match == null) { throw new ArgumentNullException("match"); } // Get a field for which the value parameter can be converted // to the specified field type. for (int i = 0; i < match.length; i++) { if (ChangeType(value, ((FieldInfo)match.get_Item(i)).get_FieldType(), culture) != null) { return (FieldInfo)match.get_Item(i); } } return null; } //BindToField public MethodBase BindToMethod(BindingFlags bindingAttr, MethodBase match[], /**@ref */ Object args[], ParameterModifier modifiers[], CultureInfo culture, String names[], /**@ref */ Object state) { // Store the arguments to the method in a state object. BinderState myBinderState = new BinderState(); Object arguments[] = new Object[args.length]; args.CopyTo(arguments, 0); myBinderState.args = arguments; state = myBinderState; if (match == null) { throw new ArgumentNullException(); } // Find a method that has the same parameters as those of the // args parameter. for (int i = 0; i < match.length; i++) { // Count the number of parameters that match. int count = 0; ParameterInfo parameters[] = ((MethodBase)match.get_Item(i)). GetParameters(); // Go on to the next method if the number of // parameters do not match. if (args.length != parameters.length) { continue; } // Match each of the parameters that the user expects // the method to have. for (int j = 0; j < args.length; j++) { // If the names parameter is not null, then reorder args. if (names != null) { if (names.length != args.length) { throw new ArgumentException("names and args must have " + "the same number of elements."); } for (int k = 0; k < names.length; k++) { if (String.Compare(((ParameterInfo)parameters. get_Item(j)).get_Name(), names.get_Item(k).ToString()) == 0) { args[j] = myBinderState.args.get_Item(k); } } } // Determine whether the types specified by the user can be // converted to the parameter type. if (ChangeType(args[j], ((ParameterInfo)parameters.get_Item(j)). get_ParameterType(), culture) != null) { count += 1; } else { break; } } // Determine whether the method has been found. if (count == args.length) { return (MethodBase)match.get_Item(i); } } return null; } //BindToMethod public Object ChangeType(Object value, Type myChangeType, CultureInfo culture) { // Determine whether the value parameter can be converted to a // value of type myType. if (CanConvertFrom(value.GetType(), myChangeType)) { // Return the converted object. return Convert.ChangeType(value, myChangeType); } else { // Return null. return null; } } //ChangeType public void ReorderArgumentArray( /**@ref */Object args[], Object state) { // Return the args that had been reordered by BindToMethod. ((BinderState)state).args.CopyTo(args, 0); } //ReorderArgumentArray public MethodBase SelectMethod(BindingFlags bindingAttr, MethodBase match[], Type types[], ParameterModifier modifiers[]) { if (match == null) { throw new ArgumentNullException("match"); } for (int i = 0; i < match.length; i++) { // Count the number of parameters that match. int count = 0; ParameterInfo parameters[] = ((MethodBase)match.get_Item(i)). GetParameters(); // Go on to the next method if the number of parameters // do not match. if (types.length != parameters.length) { continue; } // Match each of the parameters that the user expects // the method to have. for (int j = 0; j < types.length; j++) { // Determine whether the types specified by the user can be // converted to parameter type. if (CanConvertFrom((Type)types.get_Item(j), ((ParameterInfo)parameters.get_Item(j)). get_ParameterType())) { count += 1; } else { break; } } // Determine whether the method has been found. if (count == types.length) { return (MethodBase)match.get_Item(i); } } return null; } //SelectMethod public PropertyInfo SelectProperty(BindingFlags bindingAttr, PropertyInfo match[], Type returnType, Type indexes[], ParameterModifier modifiers[]) { if (match == null) { throw new ArgumentNullException("match"); } for (int i = 0; i < match.length; i++) { // Count the number of indexes that match. int count = 0; ParameterInfo parameters[] = ((PropertyInfo)match.get_Item(i)). GetIndexParameters(); // Go on to the next property if the number of indexes do not match. if (indexes.length != parameters.length) { continue; } // Match each of the indexes that the user expects // the property to have. for (int j = 0; j < indexes.length; j++) { // Determine whether the types specified by the user // can be converted to index type. if (CanConvertFrom((Type)indexes.get_Item(j), ((ParameterInfo)parameters.get_Item(j)). get_ParameterType())) { count += 1; } else { break; } } // Determine whether the property has been found. if (count == indexes.length) { // Determine whether the return type can be converted // to the properties type. if (CanConvertFrom(returnType, match.get_Item(i).GetType())) { return (PropertyInfo)match.get_Item(i); } else { continue; } } } return null; } //SelectProperty // Determines whether type1 can be converted to type2. // Check only for primitive types. private boolean CanConvertFrom(Type type1, Type type2) { if (type1.get_IsPrimitive() && type2.get_IsPrimitive()) { TypeCode typeCode1 = Type.GetTypeCode(type1); TypeCode typeCode2 = Type.GetTypeCode(type2); // If both type1 and type2 have the same type, return true. if (typeCode1.Equals(typeCode2)) { return true; } // Possible conversions from Char follow. if (typeCode1.Equals(TypeCode.Char)) { switch (typeCode2) { case TypeCode.UInt16 : return true; case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from Byte follow. if (typeCode1.Equals(TypeCode.Byte)) { switch (typeCode2) { case TypeCode.Char : return true; case TypeCode.UInt16 : return true; case TypeCode.Int16 : return true; case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from SByte follow. if (typeCode1.Equals(TypeCode.SByte)) { switch (typeCode2) { case TypeCode.Int16 : return true; case TypeCode.Int32 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from UInt16 follow. if (typeCode1.Equals(TypeCode.UInt16)) { switch (typeCode2) { case TypeCode.UInt32 : return true; case TypeCode.Int32 : return true; case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from Int16 follow. if (typeCode1.Equals(TypeCode.Int16)) { switch (typeCode2) { case TypeCode.Int32 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from UInt32 follow. if (typeCode1.Equals(TypeCode.UInt32)) { switch (typeCode2) { case TypeCode.UInt64 : return true; case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from Int32 follow. if (typeCode1.Equals(TypeCode.Int32)) { switch (typeCode2) { case TypeCode.Int64 : return true; case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from UInt64 follow. if (typeCode1.Equals(TypeCode.UInt64)) { switch (typeCode2) { case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from Int64 follow. if (typeCode1.Equals(TypeCode.Int64)) { switch (typeCode2) { case TypeCode.Single : return true; case TypeCode.Double : return true; default : return false; } } // Possible conversions from Single follow. if (typeCode1.Equals(TypeCode.Single)) { switch (typeCode2) { case TypeCode.Double : return true; default : return false; } } } return false; } //CanConvertFrom } //MyBinder public class MyClass1 { public short myFieldB; public int myFieldA; public void MyMethod(long i, char k) { Console.WriteLine("\nThis is MyMethod(long i, char k)"); } //MyMethod public void MyMethod(long i, long j) { Console.WriteLine("\nThis is MyMethod(long i, long j)"); } //MyMethod } //MyClass1 public class BinderExample { public static void main(String[] args) { // Get the type of MyClass1. Type myType = MyClass1.class.ToType(); // Get the instance of MyClass1. MyClass1 myInstance = new MyClass1(); Console.WriteLine("\nDisplaying the results of using the " + "MyBinder binder.\n"); // Get the method information for MyMethod. MethodInfo myMethod = myType.GetMethod("MyMethod", BindingFlags.Public | BindingFlags.Instance, new MyBinder(), new Type[] { short.class.ToType(), short.class.ToType() }, null); Console.WriteLine(myMethod); // Invoke MyMethod. myMethod.Invoke(myInstance, BindingFlags.InvokeMethod, new MyBinder(), new Object[] { (Int32)32, (Int32)32 }, CultureInfo.get_CurrentCulture()); } //main } //BinderExample
継承階層 System.Object
System.Reflection.Binder
System.Reflection.Binder
スレッド セーフプラットフォームWindows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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全ての辞書からBinder クラス を検索 - Binder クラスのページへのリンク
