Type.MakeGenericType(Type[]) Méthode

public:
 abstract Type ^ MakeGenericType(... cli::array <Type ^> ^ typeArguments);

public:
 virtual Type ^ MakeGenericType(... cli::array <Type ^> ^ typeArguments);

public abstract Type MakeGenericType(params Type[] typeArguments);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("The native code for this instantiation might not be available at runtime.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("If some of the generic arguments are annotated (either with DynamicallyAccessedMembersAttribute, or generic constraints), trimming can't validate that the requirements of those annotations are met.")]
public virtual Type MakeGenericType(params Type[] typeArguments);

public virtual Type MakeGenericType(params Type[] typeArguments);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("If some of the generic arguments are annotated (either with DynamicallyAccessedMembersAttribute, or generic constraints), trimming can't validate that the requirements of those annotations are met.")]
public virtual Type MakeGenericType(params Type[] typeArguments);

abstract member MakeGenericType : Type[] -> Type

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("The native code for this instantiation might not be available at runtime.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("If some of the generic arguments are annotated (either with DynamicallyAccessedMembersAttribute, or generic constraints), trimming can't validate that the requirements of those annotations are met.")>]
abstract member MakeGenericType : Type[] -> Type
override this.MakeGenericType : Type[] -> Type

abstract member MakeGenericType : Type[] -> Type
override this.MakeGenericType : Type[] -> Type

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("If some of the generic arguments are annotated (either with DynamicallyAccessedMembersAttribute, or generic constraints), trimming can't validate that the requirements of those annotations are met.")>]
abstract member MakeGenericType : Type[] -> Type
override this.MakeGenericType : Type[] -> Type

Public MustOverride Function MakeGenericType (ParamArray typeArguments As Type()) As Type

Public Overridable Function MakeGenericType (ParamArray typeArguments As Type()) As Type

Paramètres

Retours

Représentant Type le type construit formé en remplaçant les éléments des paramètres de typeArguments type du type du type actuel.

Attributs

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

Exceptions

Exemples

L’exemple suivant utilise la MakeGenericType méthode pour créer un type construit à partir de la définition de type générique pour le Dictionary<TKey,TValue> type. Le type construit représente un Dictionary<TKey,TValue> objet avec des clés de Test chaîne.

using System;
using System.Reflection;
using System.Collections.Generic;

public class Test
{
    public static void Main()
    {
        Console.WriteLine("\r\n--- Create a constructed type from the generic Dictionary type.");

        // Create a type object representing the generic Dictionary 
        // type, by omitting the type arguments (but keeping the 
        // comma that separates them, so the compiler can infer the
        // number of type parameters).      
        Type generic = typeof(Dictionary<,>);
        DisplayTypeInfo(generic);

        // Create an array of types to substitute for the type
        // parameters of Dictionary. The key is of type string, and
        // the type to be contained in the Dictionary is Test.
        Type[] typeArgs = { typeof(string), typeof(Test) };

        // Create a Type object representing the constructed generic
        // type.
        Type constructed = generic.MakeGenericType(typeArgs);
        DisplayTypeInfo(constructed);

        // Compare the type objects obtained above to type objects
        // obtained using typeof() and GetGenericTypeDefinition().
        Console.WriteLine("\r\n--- Compare types obtained by different methods:");

        Type t = typeof(Dictionary<String, Test>);
        Console.WriteLine("\tAre the constructed types equal? {0}", t == constructed);
        Console.WriteLine("\tAre the generic types equal? {0}", 
            t.GetGenericTypeDefinition() == generic);
    }

    private static void DisplayTypeInfo(Type t)
    {
        Console.WriteLine("\r\n{0}", t);

        Console.WriteLine("\tIs this a generic type definition? {0}", 
            t.IsGenericTypeDefinition);

        Console.WriteLine("\tIs it a generic type? {0}", 
            t.IsGenericType);

        Type[] typeArguments = t.GetGenericArguments();
        Console.WriteLine("\tList type arguments ({0}):", typeArguments.Length);
        foreach (Type tParam in typeArguments)
        {
            Console.WriteLine("\t\t{0}", tParam);
        }
    }
}

/* This example produces the following output:

--- Create a constructed type from the generic Dictionary type.

System.Collections.Generic.Dictionary`2[TKey,TValue]
        Is this a generic type definition? True
        Is it a generic type? True
        List type arguments (2):
                TKey
                TValue

System.Collections.Generic.Dictionary`2[System.String, Test]
        Is this a generic type definition? False
        Is it a generic type? True
        List type arguments (2):
                System.String
                Test

--- Compare types obtained by different methods:
        Are the constructed types equal? True
        Are the generic types equal? True
 */

open System
open System.Collections.Generic

type Test() = class end

let displayTypeInfo (t: Type) =
    printfn $"\r\n{t}"

    printfn $"\tIs this a generic type definition? {t.IsGenericTypeDefinition}" 

    printfn $"\tIs it a generic type? {t.IsGenericType}"

    let typeArguments = t.GetGenericArguments()
    printfn $"\tList type arguments ({typeArguments.Length}):"
    for tParam in typeArguments do
        printfn $"\t\t{tParam}"

printfn "\r\n--- Create a constructed type from the generic Dictionary type."

// Create a type object representing the generic Dictionary 
// type, by calling .GetGenericTypeDefinition().
let generic = typeof<Dictionary<_,_>>.GetGenericTypeDefinition()
displayTypeInfo generic

// Create an array of types to substitute for the type
// parameters of Dictionary. The key is of type string, and
// the type to be contained in the Dictionary is Test.
let typeArgs = [| typeof<string>; typeof<Test> |]

// Create a Type object representing the constructed generic type.
let constructed = generic.MakeGenericType typeArgs
displayTypeInfo constructed

(* This example produces the following output:

--- Create a constructed type from the generic Dictionary type.

System.Collections.Generic.Dictionary`2[TKey,TValue]
        Is this a generic type definition? True
        Is it a generic type? True
        List type arguments (2):
                TKey
                TValue

System.Collections.Generic.Dictionary`2[System.String, Test]
        Is this a generic type definition? False
        Is it a generic type? True
        List type arguments (2):
                System.String
                Test
 *)

Imports System.Reflection
Imports System.Collections.Generic

Public Class Test
    Public Shared Sub Main()
        Console.WriteLine(vbCrLf & "--- Create a constructed type from the generic Dictionary type.")

        ' Create a type object representing the generic Dictionary 
        ' type, by omitting the type arguments (but keeping the 
        ' comma that separates them, so the compiler can infer the
        ' number of type parameters).
        Dim generic As Type = GetType(Dictionary(Of ,))
        DisplayTypeInfo(generic)

        ' Create an array of types to substitute for the type
        ' parameters of Dictionary. The key is of type string, and
        ' the type to be contained in the Dictionary is Test.
        Dim typeArgs() As Type = { GetType(String), GetType(Test) }

        ' Create a Type object representing the constructed generic
        ' type.
        Dim constructed As Type = generic.MakeGenericType(typeArgs)
        DisplayTypeInfo(constructed)

        ' Compare the type objects obtained above to type objects
        ' obtained using GetType() and GetGenericTypeDefinition().
        Console.WriteLine(vbCrLf & "--- Compare types obtained by different methods:")

        Dim t As Type = GetType(Dictionary(Of String, Test))
        Console.WriteLine(vbTab & "Are the constructed types equal? " _
            & (t Is constructed))
        Console.WriteLine(vbTab & "Are the generic types equal? " _ 
            & (t.GetGenericTypeDefinition() Is generic))
    End Sub

    Private Shared Sub DisplayTypeInfo(ByVal t As Type)
        Console.WriteLine(vbCrLf & t.ToString())

        Console.WriteLine(vbTab & "Is this a generic type definition? " _ 
            & t.IsGenericTypeDefinition)

        Console.WriteLine(vbTab & "Is it a generic type? " _ 
            & t.IsGenericType)

        Dim typeArguments() As Type = t.GetGenericArguments()
        Console.WriteLine(vbTab & "List type arguments ({0}):", _
            typeArguments.Length)
        For Each tParam As Type In typeArguments       
            Console.WriteLine(vbTab & vbTab & tParam.ToString())
        Next
    End Sub
End Class

' This example produces the following output:
'
'--- Create a constructed type from the generic Dictionary type.
'
'System.Collections.Generic.Dictionary'2[TKey,TValue]
'        Is this a generic type definition? True
'        Is it a generic type? True
'        List type arguments (2):
'                TKey
'                TValue
'
'System.Collections.Generic.Dictionary`2[System.String,Test]
'        Is this a generic type definition? False
'        Is it a generic type? True
'        List type arguments (2):
'                System.String
'                Test
'
'--- Compare types obtained by different methods:
'        Are the constructed types equal? True
'        Are the generic types equal? True

Remarques

Pour plus d’informations sur cette API, consultez les remarques d’API supplémentaires pour Type.MakeGenericType.

Voir aussi

• IsGenericTypeDefinition
• GetGenericTypeDefinition()
• Réflexion et types génériques
• Guide pratique pour examiner et instancier des types génériques avec réflexion