CODEWITHSUNDEEP
c#genericslambda
John Bustos
John Bustos

Reputation: 19544

C# Convert Func<T1, object> to Func<T1, T2>

I have no doubt this is as easy to do as possible, but I have a function creator library that creates lambda functions for me of the form:

Func<T1, object>

And I'm looking to specify the out parameter more specifically - Basically, I'm looking to be able to create something along the lines of:

private Func<T1, T2> GetFunc<T1, T2>(string expression)
{
    Func<T1, object> objFunc = CreateFunction(expression));
    return objFunc as Func<T1, T2>;
}

But, when I try this, I get back a null (as an aside, if I return objFunc as a Func<T1, object> it is not a null, so I know that's not where my issue lay).

How do I do this correctly?

Upvotes: 13

Views: 1101

Answers (2)

Tyree Jackson
Tyree Jackson

Reputation: 2608

Try:

private Func<T1, T2> GetFunc<T1, T2>(string expression)
{
    Func<T1, object> objFunc = CreateFunction(expression));
    return arg=>(T2)objFunc(arg);
}

Upvotes: 16

StriplingWarrior
StriplingWarrior

Reputation: 156459

Would it work to simply wrap your existing function call in another one that performs a cast on the returned value?

return t1 => (T2)objFunc(t1);

Upvotes: 10

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