Create Expression from Func

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You can not recreate an expression based on a method since an expression needs to know the original statements, not IL. You can however create an Expresson which makes a method call to your func like:

Func<int> func = () => 1;
Expression<Func<int>> expression = Expression.Lambda<Func<int>>(Expression.Call(func.Method));

Note however that systems like EF can’t really work with this

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