ExceptionHandlingClauseOptions 列挙体
この列挙体には、メンバ値のビットごとの組み合わせを可能にする FlagsAttribute 属性が含まれています。
名前空間: System.Reflectionアセンブリ: mscorlib (mscorlib.dll 内)

<ComVisibleAttribute(True)> _ <FlagsAttribute> _ Public Enumeration ExceptionHandlingClauseOptions

メンバ名 | 説明 | |
---|---|---|
Clause | この句は、指定した型から派生するすべての例外を受け入れます。 | |
Fault | この句は、通常の制御フローの完了時ではなく、例外が発生した場合に実行されます。 | |
Filter | この句は、例外を無視するか (つまり、正常実行を再開するかどうか)、関連付けられているハンドラで処理するか、または次の句に渡すかを判断するユーザー指定の命令を格納します。 | |
Finally | この句は、通常の制御フローまたは処理できない例外の発生を通じて、try ブロックが終了するたびに実行されます。 |

メソッドに含まれる例外処理句を調べるには、MethodInfo オブジェクトを取得し、GetMethodBody メソッドを呼び出してメソッドの本体を取得します。ExceptionHandlingClauses プロパティを使用して、ExceptionHandlingClause オブジェクトの一覧を取得します。
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例外処理句を処理するには、メタデータと MSIL (Microsoft Intermediate Language) の命令書式について十分に理解している必要があります。この情報については、共通言語基盤 (CLI: Common Language Infrastructure) のドキュメント、特に「Partition II: Metadata Definition and Semantics」と「Partition III: CIL Instruction Set」を参照してください。このドキュメントは、http://msdn.microsoft.com/net/ecma/ および http://www.ecma-international.org/publications/standards/Ecma-335.htm で入手できます。 |

MethodBodyExample という名前のテスト メソッドを定義し、ローカル変数の情報および例外処理句を表示するコード例を次に示します。MethodBase.GetMethodBody メソッドは、テスト メソッドの MethodBody オブジェクトを取得するときに使用されます。ExceptionHandlingClauses プロパティは、ExceptionHandlingClause オブジェクトの一覧を取得し、それらのプロパティを表示するために使用されます。
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すべてのコンピュータ言語が ExceptionHandlingClauseOptions.Filter 句を生成できるわけではありません。Visual Basic の例では、Visual Basic の When 式による filter 句が使用されています (他の言語の例では省略されています)。 |
このコードは、MethodBody クラスのトピックで取り上げているコード例の一部分です。
Imports System Imports System.Reflection Public Class Example Public Shared Sub Main() ' Demonstrate the effect of the Visual Basic When keyword, which ' generates a Filter clause in the Try block. Dim e As New Example() Console.WriteLine() e.MethodBodyExample("String argument") e.MethodBodyExample(Nothing) ' Get method body information. Dim mi As MethodInfo = _ GetType(Example).GetMethod("MethodBodyExample") Dim mb As MethodBody = mi.GetMethodBody() Console.WriteLine(vbCrLf & "Method: {0}", mi) ' Display the general information included in the ' MethodBody object. Console.WriteLine(" Local variables are initialized: {0}", _ mb.InitLocals) Console.WriteLine(" Maximum number of items on the operand stack: {0}", _ mb.MaxStackSize) <br /><span space="preserve">...</span><br /> ' Display exception handling clauses. Console.WriteLine() For Each ehc As ExceptionHandlingClause In mb.ExceptionHandlingClauses Console.WriteLine(ehc.Flags.ToString()) ' The FilterOffset property is meaningful only for Filter ' clauses. The CatchType property is not meaningful for ' Filter or Finally clauses. Select Case ehc.Flags Case ExceptionHandlingClauseOptions.Filter Console.WriteLine(" Filter Offset: {0}", _ ehc.FilterOffset) Case ExceptionHandlingClauseOptions.Finally Case Else Console.WriteLine(" Type of exception: {0}", _ ehc.CatchType) End Select Console.WriteLine(" Handler Length: {0}", ehc.HandlerLength) Console.WriteLine(" Handler Offset: {0}", ehc.HandlerOffset) Console.WriteLine(" Try Block Length: {0}", ehc.TryLength) Console.WriteLine(" Try Block Offset: {0}", ehc.TryOffset) Next <br /><span space="preserve">...</span><br /> End Sub ' This test method is executed at the beginning of Main, to show ' how the Filter clause works. The Filter clause is generated by ' a Visual Basic When expression. If arg is Nothing, this method ' throws ArgumentNullException, which is caught by the filter ' clause. If arg is a string, the method throws ArgumentException , ' which does not match the filter clause. ' ' Sub Main also contains code to analyze this method, using ' the properties and methods of the MethodBody class. Public Sub MethodBodyExample(ByVal arg As Object) ' Define some local variables. In addition to these variables , ' the local variable list includes the variables scoped to ' the catch clauses. Dim var1 As Integer = 42 Dim var2 As String = "Forty-two" Try ' Depending on the input value, throw an ArgumentException or ' an ArgumentNullException to test the Catch clauses. ' If arg Is Nothing Then Throw New ArgumentNullException("The argument cannot be Nothing.") End If If arg.GetType() Is GetType(String) Then Throw New ArgumentException("The argument cannot be a string.") End If ' The When expression makes this a filter clause. The expression ' selects only exceptions that derive from the ArgumentException ' class. Other exceptions, including ArgumentException itself, ' are not handled by this filter clause. Catch ex As ArgumentException _ When ex.GetType().IsSubclassOf(GetType(ArgumentException)) Console.WriteLine("Filter clause caught: {0}", ex.GetType()) ' This catch clause handles the ArgumentException class, and ' any other class derived from Exception. Catch ex As Exception Console.WriteLine("Ordinary exception-handling clause caught: {0}", _ ex.GetType()) Finally var1 = 3033 var2 = "Another string." End Try End Sub End Class ' This code example produces output similar to the following: ' 'Ordinary exception-handling clause caught: System.ArgumentException 'Filter clause caught: System.ArgumentNullException ' 'Method: Void MethodBodyExample(System.Object) ' Local variables are initialized: True ' Maximum number of items on the operand stack: 3 <br /><span space="preserve">...</span><br />' 'Filter ' Filter Offset: 0 ' Handler Length: 19 ' Handler Offset: 99 ' Try Block Length: 45 ' Try Block Offset: 9 'Clause ' Type of exception: System.Exception ' Handler Length: 25 ' Handler Offset: 118 ' Try Block Length: 45 ' Try Block Offset: 9 'Finally ' Handler Length: 13 ' Handler Offset: 153 ' Try Block Length: 144 ' Try Block Offset: 9
using System; using System.Reflection; public class Example { public static void Main() { // Get method body information. MethodInfo mi = typeof(Example).GetMethod("MethodBodyExample"); MethodBody mb = mi.GetMethodBody(); Console.WriteLine("\r\nMethod: {0}", mi); // Display the general information included in the // MethodBody object. Console.WriteLine(" Local variables are initialized: {0}", mb.InitLocals); Console.WriteLine(" Maximum number of items on the operand stack: {0}", mb.MaxStackSize); <br /><span space="preserve">...</span><br /> // Display exception handling clauses. Console.WriteLine(); foreach (ExceptionHandlingClause ehc in mb.ExceptionHandlingClauses) { Console.WriteLine(ehc.Flags.ToString()); // The FilterOffset property is meaningful only for Filter // clauses. The CatchType property is not meaningful for // Filter or Finally clauses. switch (ehc.Flags) { case ExceptionHandlingClauseOptions.Filter: Console.WriteLine(" Filter Offset: {0}", ehc.FilterOffset); break; case ExceptionHandlingClauseOptions.Finally: break; default: Console.WriteLine(" Type of exception: {0}", ehc.CatchType); break; } Console.WriteLine(" Handler Length: {0}", ehc.HandlerLength); Console.WriteLine(" Handler Offset: {0}", ehc.HandlerOffset); Console.WriteLine(" Try Block Length: {0}", ehc.TryLength); Console.WriteLine(" Try Block Offset: {0}", ehc.TryOffset); } <br /><span space="preserve">...</span><br /> } // The Main method contains code to analyze this method, using // the properties and methods of the MethodBody class. public void MethodBodyExample(object arg) { // Define some local variables. In addition to these variables , // the local variable list includes the variables scoped to // the catch clauses. int var1 = 42; string var2 = "Forty-two"; try { // Depending on the input value, throw an ArgumentException or // an ArgumentNullException to test the Catch clauses. if (arg == null) { throw new ArgumentNullException("The argument cannot be null."); } if (arg.GetType() == typeof(string)) { throw new ArgumentException("The argument cannot be a string."); } } // There is no Filter clause in this code example. See the Visual // Basic code for an example of a Filter clause. // This catch clause handles the ArgumentException class, and // any other class derived from Exception. catch(Exception ex) { Console.WriteLine("Ordinary exception-handling clause caught: {0}", ex.GetType()); } finally { var1 = 3033; var2 = "Another string."; } } } // This code example produces output similar to the following: // //Method: Void MethodBodyExample(System.Object) // Local variables are initialized: True // Maximum number of items on the operand stack: 2 <br /><span space="preserve">...</span><br />// //Clause // Type of exception: System.Exception // Handler Length: 21 // Handler Offset: 70 // Try Block Length: 61 // Try Block Offset: 9 //Finally // Handler Length: 14 // Handler Offset: 94 // Try Block Length: 85 // Try Block Offset: 9
#using <System.dll> using namespace System; using namespace System::Reflection; public ref class Example { // The Main method contains code to analyze this method, using // the properties and methods of the MethodBody class. public: void MethodBodyExample(Object^ arg) { // Define some local variables. In addition to these variables , // the local variable list includes the variables scoped to // the catch clauses. int var1 = 42; String^ var2 = "Forty-two"; try { // Depending on the input value, throw an ArgumentException or // an ArgumentNullException to test the Catch clauses. if (arg == nullptr) { throw gcnew ArgumentNullException("The argument cannot " + "be null."); } if (arg->GetType() == String::typeid) { throw gcnew ArgumentException("The argument cannot " + "be a string."); } } // There is no Filter clause in this code example. See the Visual // Basic code for an example of a Filter clause. // This catch clause handles the ArgumentException class, and // any other class derived from Exception. catch (ArgumentException^ ex) { Console::WriteLine("Ordinary exception-handling clause caught:" + " {0}", ex->GetType()); } finally { var1 = 3033; var2 = "Another string."; } } }; int main() { // Get method body information. MethodInfo^ mi = Example::typeid->GetMethod("MethodBodyExample"); MethodBody^ mb = mi->GetMethodBody(); Console::WriteLine("\r\nMethod: {0}", mi); // Display the general information included in the // MethodBody object. Console::WriteLine(" Local variables are initialized: {0}", mb->InitLocals); Console::WriteLine(" Maximum number of items on the operand " + "stack: {0}", mb->MaxStackSize); <br /><span space="preserve">...</span><br /> // Display exception handling clauses. Console::WriteLine(); for each(ExceptionHandlingClause^ exhc in mb->ExceptionHandlingClauses) { Console::WriteLine(exhc->Flags.ToString()); // The FilterOffset property is meaningful only for Filter // clauses. The CatchType property is not meaningful for // Filter or Finally clauses. switch(exhc->Flags) { case ExceptionHandlingClauseOptions::Filter: Console::WriteLine(" Filter Offset: {0}", exhc->FilterOffset); break; case ExceptionHandlingClauseOptions::Finally: break; default: Console::WriteLine(" Type of exception: {0}", exhc->CatchType); break; } Console::WriteLine(" Handler Length: {0}", exhc->HandlerLength); Console::WriteLine(" Handler Offset: {0}", exhc->HandlerOffset); Console::WriteLine(" Try Block Length: {0}", exhc->TryLength); Console::WriteLine(" Try Block Offset: {0}", exhc->TryOffset); } <br /><span space="preserve">...</span><br /> // The Main method contains code to analyze this method, using // the properties and methods of the MethodBody class. public: void MethodBodyExample(Object^ arg) { // Define some local variables. In addition to these variables , // the local variable list includes the variables scoped to // the catch clauses. int var1 = 42; String^ var2 = "Forty-two"; try { // Depending on the input value, throw an ArgumentException or // an ArgumentNullException to test the Catch clauses. if (arg == nullptr) { throw gcnew ArgumentNullException("The argument cannot " + "be null."); } if (arg->GetType() == String::typeid) { throw gcnew ArgumentException("The argument cannot " + "be a string."); } } // There is no Filter clause in this code example. See the Visual // Basic code for an example of a Filter clause. // This catch clause handles the ArgumentException class, and // any other class derived from Exception. catch (ArgumentException^ ex) { Console::WriteLine("Ordinary exception-handling clause caught:" + " {0}", ex->GetType()); } finally { var1 = 3033; var2 = "Another string."; } }

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