C#、ASP.NET通用扩展工具类之TypeParse

用法：

var int1 = "2".trytoint();//转换为int失败返回0
var int2 = "2x".trytoint();
var int3 = "2".trytoint(1);//转换为int失败返回1
var int4 = "2x".trytoint(1);
 
 
var d1 = "2".trytomoney(); //同上
var d2 = "2x".trytomoney();
var d3 = "2".trytomoney(1);
var d4 = "2x".trytomoney(1);
 
string a = null;
var s1 = a.trytostring();
var s3 = a.trytostring("1");
 
 
var d11 = "2".trytodecimal();
var d22 = "2x".trytodecimal();
var d33 = "2".trytodecimal(1);
var d44 = "2x".trytodecimal(1);
 
 
var de1 = "2013-1-1".trytodate();
var de2 = "x2013-1-1".trytodate();
var de3 = "x2013-1-1".trytodate(datetime.now);
 
 
//json和model转换
var json = new { id = 1 }.modeltojson();
var model = "{id:1}".jsontomodel<modeltest>();
 
 
//list和datatable转换
var dt = new list<modeltest>().listtodatatable();
var list = dt.datatabletolist<modeltest>();

代码：

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.web.script.serialization;
using system.data;
using system.reflection;
using system.collections;
 
namespace syntacticsugar
{
  /// <summary>
  /// ** 描述：类型转换
  /// ** 创始时间：2015-6-2
  /// ** 修改时间：-
  /// ** 作者：sunkaixuan
  /// ** 使用说明：
  /// </summary>
  public static class typeparseextenions
  {
    #region 强转成int 如果失败返回 0
    /// <summary>
    /// 强转成int 如果失败返回 0
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static int trytoint(this object thisvalue)
    {
      int reval = 0;
      if (thisvalue != null && int.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return reval;
    }
    #endregion
    #region 强转成int 如果失败返回 errorvalue
    /// <summary>
    /// 强转成int 如果失败返回 errorvalue
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static int trytoint(this object thisvalue, int errorvalue)
    {
      int reval = 0;
      if (thisvalue != null && int.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return errorvalue;
    }
    #endregion
    #region 强转成double 如果失败返回 0
    /// <summary>
    /// 强转成money 如果失败返回 0
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static double trytomoney(this object thisvalue)
    {
      double reval = 0;
      if (thisvalue != null && double.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return 0;
    }
    #endregion
    #region 强转成double 如果失败返回 errorvalue
    /// <summary>
    /// 强转成double 如果失败返回 errorvalue
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="errorvalue"></param>
    /// <returns></returns>
    public static double trytomoney(this object thisvalue, int errorvalue)
    {
      double reval = 0;
      if (thisvalue != null && double.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return errorvalue;
    }
    #endregion
    #region 强转成string 如果失败返回 ""
    /// <summary>
    /// 强转成string 如果失败返回 ""
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static string trytostring(this object thisvalue)
    {
      if (thisvalue != null) return thisvalue.tostring().trim();
      return "";
    }
    #endregion
    #region 强转成string 如果失败返回 errorvalue
    /// <summary>
    /// 强转成string 如果失败返回 str
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="errorvalue"></param>
    /// <returns></returns>
    public static string trytostring(this object thisvalue, string errorvalue)
    {
      if (thisvalue != null) return thisvalue.tostring().trim();
      return errorvalue;
    }
    #endregion
    #region 强转成decimal 如果失败返回 0
    /// <summary>
    /// 强转成decimal 如果失败返回 0
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static decimal trytodecimal(this object thisvalue)
    {
      decimal reval = 0;
      if (thisvalue != null && decimal.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return 0;
    }
    #endregion
    #region 强转成decimal 如果失败返回 errorvalue
    /// <summary>
    /// 强转成decimal 如果失败返回 errorvalue
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="errorvalue"></param>
    /// <returns></returns>
    public static decimal trytodecimal(this object thisvalue, int errorvalue)
    {
      decimal reval = 0;
      if (thisvalue != null && decimal.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return errorvalue;
    }
    #endregion
    #region 强转成datetime 如果失败返回 datetime.minvalue
    /// <summary>
    /// 强转成datetime 如果失败返回 datetime.minvalue
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="i"></param>
    /// <returns></returns>
    public static datetime trytodate(this object thisvalue)
    {
      datetime reval = datetime.minvalue;
      if (thisvalue != null && datetime.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return reval;
    }
    #endregion
    #region 强转成datetime 如果失败返回 errorvalue
    /// <summary>
    /// 强转成datetime 如果失败返回 errorvalue
    /// </summary>
    /// <param name="thisvalue"></param>
    /// <param name="errorvalue"></param>
    /// <returns></returns>
    public static datetime trytodate(this object thisvalue, datetime errorvalue)
    {
      datetime reval = datetime.minvalue;
      if (thisvalue != null && datetime.tryparse(thisvalue.tostring(), out reval))
      {
        return reval;
      }
      return errorvalue;
    }
    #endregion
 
    #region json转换
    /// <summary>
    /// 将json序列化为实体
    /// </summary>
    /// <typeparam name="tentity"></typeparam>
    /// <param name="json"></param>
    /// <returns></returns>
    public static tentity jsontomodel<tentity>(this string json)
    {
      javascriptserializer jsserializer = new javascriptserializer();
      return jsserializer.deserialize<tentity>(json);
    }
    /// <summary>
    /// 将实体序列化为json
    /// </summary>
    /// <param name="model"></param>
    /// <returns></returns>
    public static string modeltojson<t>(this t model)
    {
      javascriptserializer jsserializer = new javascriptserializer();
      return jsserializer.serialize(model);
    }
 
    #endregion
 
    #region datatable list
    /// <summary>
    /// 将集合类转换成datatable
    /// </summary>
    /// <param name="list">集合</param>
    /// <returns></returns>
    public static datatable listtodatatable<t>(this list<t> list)
    {
      datatable result = new datatable();
      if (list.count > 0)
      {
        propertyinfo[] propertys = typeof(t).getproperties();
        foreach (propertyinfo pi in propertys)
        {
          result.columns.add(pi.name, pi.propertytype);
        }
 
        for (int i = 0; i < list.count; i++)
        {
          arraylist templist = new arraylist();
          foreach (propertyinfo pi in propertys)
          {
            object obj = pi.getvalue(list[i], null);
            if (obj != null && obj != dbnull.value)
              templist.add(obj);
          }
          object[] array = templist.toarray();
          result.loaddatarow(array, true);
        }
      }
      return result;
    }
    /// <summary>
    /// 将datatable转为list
    /// </summary>
    /// <typeparam name="t"></typeparam>
    /// <param name="dt"></param>
    /// <returns></returns>
    public static list<t> datatabletolist<t>(this datatable dt)
    {
      var list = new list<t>();
      type t = typeof(t);
      var plist = new list<propertyinfo>(typeof(t).getproperties());
 
      foreach (datarow item in dt.rows)
      {
        t s = system.activator.createinstance<t>();
        for (int i = 0; i < dt.columns.count; i++)
        {
          propertyinfo info = plist.find(p => p.name == dt.columns[i].columnname);
          if (info != null)
          {
            if (!convert.isdbnull(item[i]))
            {
              info.setvalue(s, item[i], null);
            }
          }
        }
        list.add(s);
      }
      return list;
    }
    #endregion
 
  }
}