Dynamic Predicates

dynamicpredicates.cs

// using DynamicLinq
public static Func<TInput, TOutput> GetFuncFromLinq<TInput, TOutput>(this string predicate)
{
    if (string.IsNullOrWhiteSpace(predicate)) return null;

    LambdaExpression expression = DynamicExpression.ParseLambda(typeof(TInput), typeof(TOutput), predicate);

    Func<TInput, TOutput> func = x => (TOutput)expression.Compile().DynamicInvoke(x);

    return func;
}

// using CS-Script
public static Func<dynamic, bool> GetFuncFromScript(this string predicate)
{
    if (string.IsNullOrWhiteSpace(predicate)) return null;

    string scriptText = @"bool GetPredicate(dynamic e) { return " + predicate + "; }";

    Func<dynamic, bool> result = CSScript.Evaluator.LoadDelegate<Func<dynamic, bool>>(scriptText);

    return result;
}