CodeTypeParameter クラス

.NET Framework クラス ライブラリ リファレンス

CodeTypeParameter クラス

メモ : このクラスは、.NET Framework version 2.0 で新しく追加されたものです。

ジェネリック型またはジェネリック メソッドの型パラメータを表します。

名前空間: System.CodeDom
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

<SerializableAttribute> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
<ComVisibleAttribute(True)> _
Public Class CodeTypeParameter
    Inherits CodeObject

Visual Basic (使用法)

Dim instance As CodeTypeParameter

C#

[SerializableAttribute] 
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)] 
[ComVisibleAttribute(true)] 
public class CodeTypeParameter : CodeObject

C++

[SerializableAttribute] 
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)] 
[ComVisibleAttribute(true)] 
public ref class CodeTypeParameter : public
 CodeObject

J#

/** @attribute SerializableAttribute() */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */ 
/** @attribute ComVisibleAttribute(true) */ 
public class CodeTypeParameter extends CodeObject

JScript

SerializableAttribute 
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) 
ComVisibleAttribute(true) 
public class CodeTypeParameter extends
 CodeObject

解説

CodeTypeParameter クラスは、ジェネリック型またはジェネリック メソッドの宣言内の型パラメータを表します。

ジェネリック型またはジェネリック メソッドの宣言には、型パラメータと呼ばれる、指定されていない型が含まれます。型パラメータ名は、ジェネリック宣言の本文内の型を表しています。たとえば、List クラスのジェネリック宣言には、型パラメータ T が含まれます。

ジェネリックの詳細については、「.NET Framework クラス ライブラリのジェネリック (C# プログラミング ガイド)」を参照してください。

使用例

CodeTypeParameter クラスを使用し、CodeDOM グラフを作成して、ジェネリック コードを含むアプリケーションを生成する方法を、次のコード例に示します。

Visual Basic

Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports System.Collections
Imports System.Collections.Specialized
Imports System.IO
Imports System.Reflection
Imports System.Text.RegularExpressions
Imports System.Globalization
Imports System.Collections.Generic


Class CodeDomGenericsDemo

    Shared Sub Main()
        Try
            CreateGenericsCode("vb", "Generic.vb",
 "GenericVB.exe")
        Catch e As Exception
            LogMessage(("Unexpected Exception:" +
 e.ToString()))
        End Try

    End Sub 'Main


    Shared Sub CreateGenericsCode(ByVal
 providerName As String, ByVal
 sourceFileName As String, ByVal assemblyName As String)

        Dim provider As CodeDomProvider = CodeDomProvider.CreateProvider(providerName)

        LogMessage("Building CodeDOM graph...")

        Dim cu As New CodeCompileUnit()

        CreateGraph(provider, cu)

        Dim sw As New StringWriter()

        LogMessage("Generating code...")
        provider.GenerateCodeFromCompileUnit(cu, sw, Nothing)

        Dim output As String
 = sw.ToString()
        output = Regex.Replace(output, "Runtime version:[^"
 + vbCr + vbLf + "]*", "Runtime
 version omitted for demo")

        LogMessage("Displaying source code...")
        LogMessage(output)

        LogMessage("Writing source code to file...")
        Dim s As Stream = File.Open(sourceFileName,
 FileMode.Create)
        Dim t As New StreamWriter(s)
        t.Write(output)
        t.Close()
        s.Close()

        Dim opt As New CompilerParameters(New
 String() {"System.dll", "System.Xml.dll",
 "System.Windows.Forms.dll", "System.Data.dll", "System.Drawing.dll"})
        opt.GenerateExecutable = False
        opt.TreatWarningsAsErrors = True
        opt.IncludeDebugInformation = True
        opt.GenerateInMemory = True

        Dim results As CompilerResults

        LogMessage(("Compiling with provider " + providerName))
        results = provider.CompileAssemblyFromFile(opt, sourceFileName)

        OutputResults(results)
        If results.NativeCompilerReturnValue <> 0 Then
            LogMessage("")
            LogMessage("Compilation failed.")
        Else
            LogMessage("")
            LogMessage("Demo completed successfully.")
        End If
        File.Delete(sourceFileName)

    End Sub 'CreateGenericsCode


    ' Create a CodeDOM graph.
    Shared Sub CreateGraph(ByVal
 provider As CodeDomProvider, ByVal cu As
 CodeCompileUnit)
        ' Determine if the generator supports generics.
        If Not provider.Supports(GeneratorSupport.GenericTypeReference
 Or GeneratorSupport.GenericTypeDeclaration) Then
            ' Return if the generator does not support generics.
            Return
        End If
        Dim ns As New CodeNamespace("DemoNamespace")
        ns.Imports.Add(New CodeNamespaceImport("System"))
        ns.Imports.Add(New CodeNamespaceImport("System.Collections.Generic"))
        cu.Namespaces.Add(ns)

        ' Declare a generic class.
        Dim class1 As New
 CodeTypeDeclaration()
        class1.Name = "MyDictionary"
        class1.BaseTypes.Add( _
            New CodeTypeReference("Dictionary",
 _
                New CodeTypeReference() {New CodeTypeReference("TKey"),
 _
                    New CodeTypeReference("TValue")}))
        Dim kType As New
 CodeTypeParameter("TKey")
        kType.HasConstructorConstraint = True
        kType.Constraints.Add(New CodeTypeReference(GetType(IComparable)))
        kType.CustomAttributes.Add _
            (New CodeAttributeDeclaration("System.ComponentModel.DescriptionAttribute",
 _
                New CodeAttributeArgument(New
 CodePrimitiveExpression("KeyType"))))
        Dim iComparableT As New
 CodeTypeReference("IComparable")
        iComparableT.TypeArguments.Add(New CodeTypeReference(kType))

        kType.Constraints.Add(iComparableT)

        Dim vType As New
 CodeTypeParameter("TValue")
        vType.Constraints.Add(New CodeTypeReference(GetType(IList(Of
 System.String))))
        vType.CustomAttributes.Add _
            (New CodeAttributeDeclaration("System.ComponentModel.DescriptionAttribute",
 _
                New CodeAttributeArgument(New
 CodePrimitiveExpression("ValueType"))))

        class1.TypeParameters.Add(kType)
        class1.TypeParameters.Add(vType)

        ns.Types.Add(class1)

        ' Declare a generic method.
        Dim printMethod As New
 CodeMemberMethod()
        Dim sType As New
 CodeTypeParameter("S")
        sType.HasConstructorConstraint = True
        Dim tType As New
 CodeTypeParameter("T")
        tType.HasConstructorConstraint = True

        printMethod.Name = "Print"
        printMethod.TypeParameters.Add(sType)
        printMethod.TypeParameters.Add(tType)

        printMethod.Statements.Add(ConsoleWriteLineStatement _
            (New CodeDefaultValueExpression(New
 CodeTypeReference("T"))))
        printMethod.Statements.Add(ConsoleWriteLineStatement _
            (New CodeDefaultValueExpression(New
 CodeTypeReference("S"))))
        printMethod.Attributes = MemberAttributes.Public
        class1.Members.Add(printMethod)

        Dim class2 As New
 CodeTypeDeclaration()
        class2.Name = "Demo"

        Dim methodMain As New
 CodeEntryPointMethod()

        Dim [myClass] As New
 CodeTypeReference("MyDictionary", _
            New CodeTypeReference() {New CodeTypeReference(GetType(Integer)),
 _
                New CodeTypeReference("List",
 _
                    New CodeTypeReference() {New CodeTypeReference("System.String")})})

        methodMain.Statements.Add(New CodeVariableDeclarationStatement([myClass],
 _
            "dict", New CodeObjectCreateExpression([myClass])))

        methodMain.Statements.Add(ConsoleWriteLineStatement _
            (New CodePropertyReferenceExpression _
                (New CodeVariableReferenceExpression("dict"),
 "Count")))

        methodMain.Statements.Add _
            (New CodeExpressionStatement _
                (New CodeMethodInvokeExpression _
                    (New CodeMethodReferenceExpression _
                        (New CodeVariableReferenceExpression("dict"),
 _
                            "Print", New
 CodeTypeReference() _
                                    {New CodeTypeReference("System.Decimal"),
 _
                                        New CodeTypeReference("System.Int32")}),
 _
                                            New CodeExpression(-1)
 {})))
        Dim longTypeName As String
 = GetType( _
            System.Collections.Generic.Dictionary(Of Integer,
 _
                System.Collections.Generic.List(Of String))()).FullName

        Dim longType As New
 CodeTypeReference(longTypeName)

        methodMain.Statements.Add(New CodeVariableDeclarationStatement
 _
            (longType, "dict2", New
 CodeArrayCreateExpression _
                (longType, New CodeExpression(0) {New CodePrimitiveExpression(Nothing)})))

        methodMain.Statements.Add(ConsoleWriteLineStatement(New
 CodePropertyReferenceExpression(New CodeVariableReferenceExpression("dict2"),
 "Length")))

        class2.Members.Add(methodMain)
        ns.Types.Add(class2)

    End Sub 'CreateGraph


    Overloads Shared Function
 ConsoleWriteLineStatement(ByVal exp As CodeExpression)
 As CodeStatement
        Return New CodeExpressionStatement(New
 CodeMethodInvokeExpression _
            (New CodeMethodReferenceExpression _
                (New CodeTypeReferenceExpression _
                    (New CodeTypeReference("Console")),
 "WriteLine"), _
                        New CodeExpression() {exp}))

    End Function 'ConsoleWriteLineStatement


    Overloads Shared Function
 ConsoleWriteLineStatement(ByVal [text] As
 String) As CodeStatement
        Return ConsoleWriteLineStatement(New
 CodePrimitiveExpression([text]))

    End Function 'ConsoleWriteLineStatement

    Shared Sub LogMessage(ByVal
 [text] As String)
        Console.WriteLine([text])

    End Sub 'LogMessage


    Shared Sub OutputResults(ByVal
 results As CompilerResults)
        LogMessage(("NativeCompilerReturnValue=" +
 results.NativeCompilerReturnValue.ToString()))
        Dim s As String
        For Each s In results.Output
            LogMessage(s)
        Next s

    End Sub 'OutputResults
End Class 'CodeDomGenericsDemo
 

C#

using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Collections.Generic;
namespace System.CodeDom
{
    class CodeDomGenericsDemo
    {
        static void Main()
        {
            try
            {
                CreateGenericsCode("cs", "Generic.cs", "GenericCS.exe");
            }
            catch (Exception e)
            {
                LogMessage("Unexpected Exception:" + e.ToString());
            }
        }

        static void CreateGenericsCode(string
 providerName, string sourceFileName, string
 assemblyName)
        {

            CodeDomProvider provider = CodeDomProvider.CreateProvider(providerName);

            LogMessage("Building CodeDOM graph...");

            CodeCompileUnit cu = new CodeCompileUnit();

            CreateGraph(provider, cu);

            StringWriter sw = new StringWriter();

            LogMessage("Generating code...");
            provider.GenerateCodeFromCompileUnit(cu, sw, null);

            string output = sw.ToString();
            output = Regex.Replace(output, "Runtime Version:[^\r\n]*",
                "Runtime Version omitted for demo");

            LogMessage("Dumping source...");
            LogMessage(output);

            LogMessage("Writing source to file...");
            Stream s = File.Open(sourceFileName, FileMode.Create);
            StreamWriter t = new StreamWriter(s);
            t.Write(output);
            t.Close();
            s.Close();

            CompilerParameters opt = new CompilerParameters(new
 string[]{
                                      "System.dll", 
                                      "System.Xml.dll",
                                      "System.Windows.Forms.dll",
                                      "System.Data.dll",
                                      "System.Drawing.dll"});
            opt.GenerateExecutable = false;
            opt.TreatWarningsAsErrors = true;
            opt.IncludeDebugInformation = true;
            opt.GenerateInMemory = true;

            CompilerResults results;

            LogMessage("Compiling with " + providerName);
            results = provider.CompileAssemblyFromFile(opt, sourceFileName);

            OutputResults(results);
            if (results.NativeCompilerReturnValue != 0)
            {
                LogMessage("");
                LogMessage("Compilation failed.");
            }
            else
            {
                LogMessage("");
                LogMessage("Demo completed successfully.");
            }
            File.Delete(sourceFileName);
        }

        // Create a CodeDOM graph.
        static void CreateGraph(CodeDomProvider
 provider, CodeCompileUnit cu)
        {
            if (!provider.Supports(GeneratorSupport.GenericTypeReference
 |
               GeneratorSupport.GenericTypeDeclaration))
            {
                // Return if the generator does not support generics.
                return;
            }

            CodeNamespace ns = new CodeNamespace("DemoNamespace");
            ns.Imports.Add(new CodeNamespaceImport("System"));
            ns.Imports.Add(new CodeNamespaceImport("System.Collections.Generic"));
            cu.Namespaces.Add(ns);

            // Declare a generic class.
            CodeTypeDeclaration class1 = new CodeTypeDeclaration();
            class1.Name = "MyDictionary";
            class1.BaseTypes.Add(new CodeTypeReference("Dictionary"
,
                                      new CodeTypeReference[]
 {
                                          new CodeTypeReference("TKey"),
    
                                          new CodeTypeReference("TValue"),
    
                                     }));
            CodeTypeParameter kType = new CodeTypeParameter("TKey");
            kType.HasConstructorConstraint = true;
            kType.Constraints.Add(new CodeTypeReference(typeof(IComparable)));
            kType.CustomAttributes.Add(new CodeAttributeDeclaration(
                "System.ComponentModel.DescriptionAttribute",
                    new CodeAttributeArgument(new
 CodePrimitiveExpression("KeyType"))));

            CodeTypeReference iComparableT = new CodeTypeReference("IComparable");
            iComparableT.TypeArguments.Add(new CodeTypeReference(kType));

            kType.Constraints.Add(iComparableT);

            CodeTypeParameter vType = new CodeTypeParameter("TValue");
            vType.Constraints.Add(new CodeTypeReference(typeof(IList<System.String>)));
            vType.CustomAttributes.Add(new CodeAttributeDeclaration(
                "System.ComponentModel.DescriptionAttribute",
                    new CodeAttributeArgument(new
 CodePrimitiveExpression("ValueType"))));

            class1.TypeParameters.Add(kType);
            class1.TypeParameters.Add(vType);

            ns.Types.Add(class1);

            // Declare a generic method.
            CodeMemberMethod printMethod = new CodeMemberMethod();
            CodeTypeParameter sType = new CodeTypeParameter("S");
            sType.HasConstructorConstraint = true;
            CodeTypeParameter tType = new CodeTypeParameter("T");
            sType.HasConstructorConstraint = true;

            printMethod.Name = "Print";
            printMethod.TypeParameters.Add(sType);
            printMethod.TypeParameters.Add(tType);

            printMethod.Statements.Add(ConsoleWriteLineStatement(
                new CodeDefaultValueExpression(new
 CodeTypeReference("T"))));
            printMethod.Statements.Add(ConsoleWriteLineStatement(
                new CodeDefaultValueExpression(new
 CodeTypeReference("S"))));

            printMethod.Attributes = MemberAttributes.Public;
            class1.Members.Add(printMethod);

            CodeTypeDeclaration class2 = new CodeTypeDeclaration();
            class2.Name = "Demo";

            CodeEntryPointMethod methodMain = new CodeEntryPointMethod();

            CodeTypeReference myClass = new CodeTypeReference(
                "MyDictionary",
                new CodeTypeReference[] {
                    new CodeTypeReference(typeof(int))
,
                    new CodeTypeReference("List", 
                       new CodeTypeReference[] 
                            {new CodeTypeReference("System.String")
 })});

            methodMain.Statements.Add(
                  new CodeVariableDeclarationStatement(myClass
,
                      "dict",
                          new CodeObjectCreateExpression(myClass)));

            methodMain.Statements.Add(ConsoleWriteLineStatement(
                new CodePropertyReferenceExpression(
                      new CodeVariableReferenceExpression("dict")
,
                            "Count")));

            methodMain.Statements.Add(new CodeExpressionStatement(
                 new CodeMethodInvokeExpression(
                      new CodeMethodReferenceExpression(
                         new CodeVariableReferenceExpression("dict")
,
                             "Print",
                                 new CodeTypeReference[] {
                                    new CodeTypeReference("System.Decimal")
,
                                       new CodeTypeReference("System.Int32")
,}),
                                           new CodeExpression[0])));

            string dictionaryTypeName = typeof(System.Collections.Generic.Dictionary<int
,
                System.Collections.Generic.List<string>>[]).FullName;

            CodeTypeReference dictionaryType = new CodeTypeReference(dictionaryTypeName);
            methodMain.Statements.Add(
                  new CodeVariableDeclarationStatement(dictionaryType,
 "dict2",
                     new CodeArrayCreateExpression(dictionaryType,
 new CodeExpression[1] { new CodePrimitiveExpression(null)
 })));

            methodMain.Statements.Add(ConsoleWriteLineStatement(
                           new CodePropertyReferenceExpression(
                                new CodeVariableReferenceExpression("dict2")
,
                                        "Length")));

            class2.Members.Add(methodMain);
            ns.Types.Add(class2);

        }

        static CodeStatement ConsoleWriteLineStatement(CodeExpression
 exp)
        {
            return new CodeExpressionStatement(
                new CodeMethodInvokeExpression(
                   new CodeMethodReferenceExpression(
                       new CodeTypeReferenceExpression(new
 CodeTypeReference("Console")),
                           "WriteLine"),
                               new CodeExpression[]{
                                   exp,
                                     }));
        }

        static CodeStatement ConsoleWriteLineStatement(string
 text)
        {
            return ConsoleWriteLineStatement(new
 CodePrimitiveExpression(text));
        }
        static void LogMessage(string
 text)
        {
            Console.WriteLine(text);
        }

        static void OutputResults(CompilerResults
 results)
        {
            LogMessage("NativeCompilerReturnValue=" +
                results.NativeCompilerReturnValue.ToString());
            foreach (string s in
 results.Output)
            {
                LogMessage(s);
            }
        }

    }
}

継承階層

System.Object
   System.CodeDom.CodeObject
    System.CodeDom.CodeTypeParameter

スレッド セーフ

この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
CodeTypeParameter メンバ
System.CodeDom 名前空間