CODEWITHSUNDEEP
c#.net
Emwat
Emwat

Reputation: 126

passing an object to a delegate

I have a function to do an API call. I want to pass an object through that function to my delegate methods, so that I have flexibility on showing a success/error message.

This object can be a Label, a string, maybe even JSON if I want to go there.

 public delegate void ifItWorks(theParameter[] delegateParms, 
    ref object delegateObject);

 public delegate void ifItThrows(theParameter[] delegateParms, 
    ref object delegateObject);

 public static void apiCall(string yourCredentials, 
    theParameter[] yourParms, ifItWorks sendSuccess, ifItThrows sendAlert,
    ref object yourObject)

How do I make this work? I'm fighting the compiler to figure this out.

The usual errors I get are

A ref or out argument must be an assignable

or

Delegate has some invalid arguments

Upvotes: 0

Views: 733

Answers (1)

Servy
Servy

Reputation: 203802

Your API method can just ignore whatever the delegate needs and let the caller of your method use a closure to capture whatever object(s) they need.

public static void apiCall(string yourCredentials, Action sendSuccess, Action sendAlert)
{
    try
    {
        DoSomething();
        sendSuccess()
    }
    catch
    {
        sendAlert();
    }
}

The caller can then write:

var someObject = CreateAnObjectINeed();
apiCall(credentials, () => DoSomething(someObject), () => HandleError(someObject);

Upvotes: 1

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