Question on delegate Func<CustType, string, string, byte[]>

The VS2012 (.NET 4.5) compiler complains the following code:

public Func<CustType, String, String, byte[]> TokenServiceImpl { get; set; }

SomeType GetToken(CustType c, String server, string app, out byte[] key)
{
    if (TokenServiceImpl == null) {throw new exception("xxxxx");
   
    // This is the line where it gets compiler error
    return  TokenServiceImpl (c, server, app, out key);
}

Error:  Delegate "Func" does not take 4 arguments.

I have spend quite some on it but still cannot figure it out.
Can someone offer any suggestion? Big thanks in advance.
LVL 1
chuang4630Asked:
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käµfm³d 👽Commented:
Two things:  1) The error is correct:  Your delegate does not take 4 parameters; it takes 3, with a return type of byte[]    2) The out that you see in Intellisense:

Screenshot
...has to do with the result being covariant, and not as a direct reference to the object in memory like you have with the out keyword. In other words, you don't need out in that statement.

As to how to fix your error, you would need to describe more about what you are trying to accomplish.
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