How to get Method Name of Generic Func<T> passed into Method

Question

I'm trying to get the method name of a function passed into an object using a .Net closure like this:

Method Signature

public IEnumerable<T> GetData<T>(Func<IEnumerable<T>> WebServiceCallback) 
where T : class    
{
    // either gets me '<LoadData>b__3'
    var a = nrdsWebServiceCallback.Method.Name;
    var b = nrdsWebServiceCallback.GetInvocationList();

    return WebServiceCallback();
}

I'm calling it like this:

SessionStateService.Labs = CacheManager.GetData(() =>  
WCFService.GetLabs(SessionStateService.var1, SessionStateService.var2));

Seeing 'b__3' instead of WCFServce.GetLabs(..) etc

Answer 1

You're looking at the name of the lambda expression (generated by the compiler), instead of the name of the method called inside the lambda.

You have to use an <Expression<Func<T>> instead of a Func<T>. Expressions can be parsed and analyzed.

Try

public IEnumerable<T> GetData<T>(Expression<Func<IEnumerable<T>>> callbackExpression) 
where T : class    
{
    var methodCall = callbackExpression.Body as MethodCallExpression;
    if(methodCall != null)
    {
        string methodName = methodCall.Method.Name;
    }

    return callbackExpression.Compile()();
}