C#反射基本类型的TryParse的方法

 几个基本类型都有TryParse方法，将object 自动识别类型和转换

using System.Reflection;

public static bool TryParse<T>(object val, out T t)
{
    t = default(T);
    if (val == null)
    {
        return true;//返回类型的默认值
    }

    Type type = typeof(T);

    string typeName = type.Name.ToLower();
    if (typeName == "string")
    {
        t = (T)((object)val.ToString()); //直接返回转换
        return true;
    }

    if (type.IsGenericType)  //泛型Nullable判断，取其中的类型
    {
        type = type.GetGenericArguments()[0];
    }

    Type[] types = new Type[] { typeof(string), type.MakeByRefType() };
    ParameterModifier[] modifiers = new ParameterModifier[] { new ParameterModifier(2) };
    MethodInfo methodInfo = type.GetMethod("TryParse", BindingFlags.Public | BindingFlags.Static, Type.DefaultBinder, types, modifiers);
    if (methodInfo != null)
    {
        object[] parameters = new object[] { val.ToString(), Activator.CreateInstance(type) };
        if ((bool)methodInfo.Invoke(null, parameters))
        {
            t = (T)parameters[1];
            return true;
        }
    }
    return false;
}