I have a method that accepts an Expression<Func<T, bool>>
as a parameter. I would like to use it as a predicate in the List.Find() method, but I can't seem to convert it to a Predicate which List takes. Do you know a simple way to do this?
public IList<T> Find<T>(Expression<Func<T, bool>> expression) where T : class, new() { var list = GetList<T>(); var predicate = [what goes here to convert expression?]; return list.Find(predicate); }
Update
Combining answers from tvanfosson and 280Z28, I am now using this:
public IList<T> Find<T>(Expression<Func<T, bool>> expression) where T : class, new() { var list = GetList<T>(); return list.Where(expression.Compile()).ToList(); }
Func<T, bool> func = expression.Compile(); Predicate<T> pred = t => func(t);
Edit: per the comments we have a better answer for the second line:
Predicate<T> pred = func.Invoke;
Another options which hasn't been mentioned:
Func<T, bool> func = expression.Compile(); Predicate<T> predicate = new Predicate<T>(func);
This generates the same IL as
Func<T, bool> func = expression.Compile(); Predicate<T> predicate = func.Invoke;
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