Lambda and Expression.Call for an extension method

Question

I need to implement an expression for a method like here:

var prop = Expression.Property(someItem, \"Name\"); 
var value = Expression.Constant(someConstant);         


        

Answer 1

Try this

public class Person
{
    public string Name { get; set; }
}
public static class StringEx
{
    public static bool Like(this string a, string b)
    {
        return a.ToLower().Contains(b.ToLower());
    }
}

Person p = new Person(){Name = "Me"};
var prop = Expression.Property(Expression.Constant(p), "Name");
var value = Expression.Constant("me");
var like = typeof(StringEx).GetMethod("Like", BindingFlags.Static
                        | BindingFlags.Public | BindingFlags.NonPublic);
var comparer = Expression.Call(null, like, prop, value );

var vvv = (Func) Expression.Lambda(comparer).Compile();
bool isEquals = vvv.Invoke();