UnmanagedCallConvAttribute 类

定义

public ref class UnmanagedCallConvAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method, AllowMultiple=false, Inherited=false)]
public sealed class UnmanagedCallConvAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method, AllowMultiple=false, Inherited=false)>]
type UnmanagedCallConvAttribute = class
    inherit Attribute

Public NotInheritable Class UnmanagedCallConvAttribute
Inherits Attribute

继承

Object

Attribute

UnmanagedCallConvAttribute

属性

AttributeUsageAttribute

示例

以下示例使用 UnmanagedCallConvAttribute 指定调用约定声明 P/Invokes。

cdecl使用调用约定：

// Target will be invoked using the cdecl calling convention
[UnmanagedCallConv(CallConvs = new Type[] { typeof(CallConvCdecl) })]
[DllImport("NativeLibrary", EntryPoint = "native_function_cdecl")]
internal static extern int NativeFunction(int arg);

// Target will be invoked using the cdecl calling convention and with the GC transition suppressed
[UnmanagedCallConv(CallConvs = new Type[] { typeof(CallConvCdecl), typeof(CallConvSuppressGCTransition) })]
[DllImport("NativeLibrary", EntryPoint = "native_function_cdecl")]
internal static extern int NativeFunction_NoGCTransition(int arg);

stdcall使用调用约定：

// Target will be invoked using the stdcall calling convention
[UnmanagedCallConv(CallConvs = new Type[] { typeof(CallConvStdcall) })]
[DllImport("NativeLibrary", EntryPoint = "native_function_stdcall")]
internal static extern int NativeFunction(int arg);

// Target will be invoked using the stdcall calling convention and with the GC transition suppressed
[UnmanagedCallConv(CallConvs = new Type[] { typeof(CallConvStdcall), typeof(CallConvSuppressGCTransition) })]
[DllImport("NativeLibrary", EntryPoint = "native_function_stdcall")]
internal static extern int NativeFunction_NoGCTransition(int arg);

注解

当此属性应用于DllImportAttribute的方法时，其中CallingConvention未设置或设置为 Winapi，.NET运行时将使用 CallConvs 来确定 P/Invoke 的调用约定。

如果应用于不DllImportAttribute带或设置为其他Winapi内容的方法，CallingConvention则忽略此属性。