C#:Creating Multicast delegate with boolean return type

c#, delegates

Solution

public delegate bool Foo(DateTime timestamp);

This is how to declare a delegate with the signature you describe. All delegates are potentially multicast, they simply require initialization. Such as:

public bool IsGreaterThanNow(DateTime timestamp)
{
    return DateTime.Now < timestamp;
}

public bool IsLessThanNow(DateTime timestamp)
{
    return DateTime.Now > timestamp;
}

Foo f1 = IsGreaterThanNow;
Foo f2 = IsLessThanNow;
Foo fAll = f1 + f2;

Calling `fAll`, in this case would call both `IsGreaterThanNow()` and `IsLessThanNow()`.

What this doesn't do is give you access to each return value. All you get is the last value returned. If you want to retrieve each and every value, you'll have to handle the multicasting manually like so:

List<bool> returnValues = new List<bool>();
foreach(Foo f in fAll.GetInvocationList())
{
    returnValues.Add(f(timestamp));
}

Problem

Hai Techies, in C#, how can we define the multicast delegate which accepts a DateTime object and return a boolean. Thanks

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