异步调用WCF方法

Question

I have the following problem:

My WCF-Method looks like this

public TransferResult<bool> ExecuteMyMethod(string jobName, 
                                   Collection<KeyValuePair<string, string>> parameters)
{
    do something;
}

The corresponding contract:

[OperationContract]
TransferResult<bool> ExecuteMyMethod(string jobName, 
                                  Collection<KeyValuePair<string, string>> parameters);

Now in our project there exists a proxy wrapper with which you can invoke methods asynchronously and which I must use:

 public void InvokeAsync<TArg1, TArg2, TResult>(
    Expression<Func<IMyServiceClient, Func<TArg1, TArg2, AsyncCallback, object, IAsyncResult>>> beginMethod, 
    Expression<Func<IMyServiceClient, Func<IAsyncResult, TransferResult<TResult>>>> endMethod, 
    TArg1 arg1, 
    TArg2 arg2, 
    Action<Task<TransferResult<TResult>>> continuationAction)
{
    do something;
}

When I try to invoke my method like this:

this.wrapper.InvokeAsync<string, Collection<KeyValuePair<string, string>>, bool>(
                svc => svc.BeginExecuteMyMethod,
                svc => svc.EndExecuteMyMethod,
                "jobname",
                parameters,
                this.ContinuationAction);

The VS keeps telling me:

Expected a method with 'IAsyncResult BeginExecuteMyMethod(string, Collection>, AsyncCallback, object)' signature

Can you please tell me what I'm doing wrong? The parameters parameter is of type Collection> I am very new to WCF and don't really know what the problem is :(

Thanks in advance

Edit

I verified that the attribute [OperationContractAttribute(AsyncPattern=true)] is set on the BeginExecuteMyMethod method in the service reference

Edit2 This is what the body of the IMyServiceClient looks like

[System.ServiceModel.OperationContractAttribute(Action="http://tempuri.org/IMyService/ExecuteMyMethod", ReplyAction="http://tempuri.org/IMyService/ExecuteMyMethod")]
TransferResult<bool> ExecuteMyMethod(string jobName, System.Collections.ObjectModel.Collection<MyService.KeyValuePairOfstringstring> parameters);

[System.ServiceModel.OperationContractAttribute(AsyncPattern=true, Action="http://tempuri.org/IMyService/ExecuteMyMethod", ReplyAction="http://tempuri.org/IMyService/ExecuteMyMethod")]
System.IAsyncResult BeginExecuteMyMethod(string jobName, System.Collections.ObjectModel.Collection<MyService.KeyValuePairOfstringstring> parameters, System.AsyncCallback callback, object asyncState);
TransferResult<bool> EndExecuteMyMethod(System.IAsyncResult result);

Answer 1

Look at the BeginExecuteMethod , parameters is type of Collection<KeyValuePairOfstringstring> , but if you look at your wrapper, you're calling InvokeAsync with different type Collection<KeyValuePair<string, string>>

BeginExecute method

IAsyncResult BeginExecuteMyMethod(string jobName, Collection<KeyValuePairOfstringstring> parameters, AsyncCallback callback, object asyncState);

InvokeAsync call

this.wrapper.InvokeAsync<string, Collection<KeyValuePair<string, string>>, bool>(
            svc => svc.BeginExecuteMyMethod,
            svc => svc.EndExecuteMyMethod,
            "jobname",
            parameters,
            this.ContinuationAction);