Type-safe GetMethod: get a MethodInfo without a magic string

ExpressionUtil.cs

using System;
using System.Reflection;
using System.Linq.Expressions;

class ExpressionUtil
{
    // Returns the MethodInfo of the given lambda. Use instead of Type.GetMethod("name", paramTypes).
    public static MethodInfo GetMethod<T>(Expression<Action<T>> lambda)
    {
        var call = lambda.Body as MethodCallExpression;
        if (call == null)
            throw new ArgumentException("Expression body was expected to be a method call, but was '" + lambda.Body + "' (" + call.GetType()  + ")");
        return call.Method;
    }
}