How to convert Func <T, bool> to an expression <Func <T, bool >>

Question

I have a Func like this:

 Func<MyClass, bool> func = x=>Id == 5;

How can I convert it to:

 Expression<Func<MyClass, bool>>

+5

Arian Feb 16 '13 at 5:35

3 answers

You can simply write:

Expression<Func<MyClass,bool>> expr = x=>Id == 5;

This will set expras an expression tree for Id == 5.

If you do:

Func<MyClass, bool> func = x=>Id == 5;
Expression<Func<MyClass, bool>> expr = mc => func(mc);

Then it will set expras the expression tree for the call func, not the expression tree for the body func.

+9

Sean Feb 18 '13 at 11:51

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+2

svick 16 . '13 14:23

Memoizer · Accepted Answer · 2013-02-16T05:48:10+0000

Try the following:

Func<MyClass, bool> func = x=>Id == 5;
Expression<Func<MyClass, bool>> expr = mc => func(mc);