通用TryParse

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.ComponentModel;

namespace NetService
{
public static class GenericParser
{
public static bool TryParse<T>(this string input, out T output)
{
bool result = false;
output = default(T);
try
{
var parse = TypeDescriptor.GetConverter(typeof(T));
if (parse != null)
{
output = (T)parse.ConvertFromString(input);
result = true;
}
}
catch
{

}
return result;
}

public static T ConvertType<T>(object val)
{
if (val == null) return default(T);//返回类型的默认值
Type tp = typeof(T);
//泛型Nullable判断，取其中的类型
if (tp.IsGenericType)
{
tp = tp.GetGenericArguments()[0];
}
//string直接返回转换
if (tp.Name.ToLower() == "string")
{
return (T)val;
}
//反射获取TryParse方法
var TryParse = tp.GetMethod("TryParse", BindingFlags.Public | BindingFlags.Static, Type.DefaultBinder,
new Type[] { typeof(string), tp.MakeByRefType() },
new ParameterModifier[] { new ParameterModifier(2) });
var parameters = new object[] { val, Activator.CreateInstance(tp) };
bool success = (bool)TryParse.Invoke(null, parameters);
//成功返回转换后的值，否则返回类型的默认值
if (success)
{
return (T)parameters[1];
}
return default(T);
}
}
}