使用动态类型和通用回调作为参数调用通用非静态方法

时间:2013-03-06 13:12:33

标签: c# generics mono

使用Xamarin / Mono为Android(以及后来的iOS)开发应用程序。通常我使用此代码来调用非静态泛型方法,它很有效:

serverService.GetCustomListObject<T> (firstRequestInLine,
                                      null,
                                      onGetCustomListObjectFromThread<T>,
                                      onGetCustomListObjectFromThreadError); 

其中回调定义为:

private void onGetCustomListObjectFromThread<T> (List<T> list, 
                                                 RequestStateGen<T>.SuccessfullDelegateType successDel
{ ... }

private void onGetCustomListObjectFromThreadError (String error,
                                                   WebRequest failedRequest)
{ ... }

但是,现在我需要调用GetCustomListObject<t>动态设置t。我对泛型非常陌生,但是从其他示例中尝试了以下代码却没有成功:

typeof(ServerService).GetMethod ("GetCustomListObject").MakeGenericMethod (t).Invoke (serverService, new object[] {
        firstRequestInLine,
        null,
        typeof(LocalServerService).GetMethod ("onGetCustomListObjectFromThread").MakeGenericMethod (t),
        typeof(LocalServerService).GetMethod ("onGetCustomListObjectFromThreadError")
        });

其中LocalServerService是我的所有示例所在的类,而serverService的类型为ServerService

我收到以下错误:

Error: Ambiguous matching in method resolution

编辑: ServerService中的GetCustomListObject:

public void GetCustomListObject<T> (WebRequest request,
                                    RequestStateGen<T>.SuccessfullDelegateType successDelegate,
                                    RequestStateGen<T>.InternalSuccessDelegateType internalSuccessDelegate,
                                    RequestStateGen<T>.ErrorDelegateType errorDelegate)

1 个答案:

答案 0 :(得分:1)

在原始代码中,您正在调用传递委托的方法。

在您的反思代码中,您似乎传递了MethodInfo值 - 我不相信它们会自动转换为代理。

不幸的是,如果不知道GetCustomListObject方法的声明就很难提供一个好的代码示例,但是你想要某些东西

Type thirdArgType = typeof(Foo<>).MakeGenericGenericType(t);
MethodInfo thirdArgMethod = typeof(LocalServerService)
                                .GetMethod("onGetCustomListObjectFromThread",
                                           BindingFlags.Instance | BindingFlags.NonPublic)
                                .MakeGenericMethod(t);
Delegate thirdArg = Delegate.CreateDelegate(thirdArgType, this, thirdArgMethod);

MethodInfo fourthArgMethod = typeof(LocalServerService)
                                 .GetMethod("onGetCustomListObjectFromThreadError",
                                            BindingFlags.Instance | BindingFlags.NonPublic);
Delegate fourthArg = Delegate.CreateDelegate(typeof(Bar), this, fourthArgMethod);

MethodInfo method = typeof(ServerService).GetMethod("GetCustomListObject")
                                         .MakeGenericMethod (t);
method.Invoke(serverService,
    new object[] {firstRequestInline, null, thirdArg, fourthArg });