C#常用方法类库：数据类型

时间：2014-04-11 22:49:35 阅读：654 评论：0 收藏：0 [点我收藏+]

这个C#类定义了一些开发过程中经常要使用的到的函数和方法，包括数据转换，数据类型判断，格式化日期、计算两个日期之间的差值等等，你还可以自己扩充这个类，把自己常用的函数或者方法放进去。

using System;
using System.IO;
using System.Data;
using System.Collections;
using System.Text.RegularExpressions;
using System.Web.UI;

namespace DotNet.Utilities
{
/// <summary>
/// Utility 的摘要说明。
/// </summary>
public class Utility:Page
{

  #region 数据转换
  /// <summary>
  /// 返回对象obj的String值,obj为null时返回空值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>字符串。</returns>
  public static string ToObjectString(object obj)
  {
   return null == obj ? String.Empty : obj.ToString();
  }

  /// <summary>
  /// 将对象转换为数值(Int32)类型,转换失败返回-1。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Int32数值。</returns>
  public static int ToInt(object obj)
  {
   try
   {
    return int.Parse(ToObjectString(obj));
   }
   catch
   { return -1; }
  }

  /// <summary>
  /// 将对象转换为数值(Int32)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Int32数值。</returns>
  public static int ToInt(object obj,int returnValue)
  {
   try
   {
    return int.Parse(ToObjectString(obj));
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 将对象转换为数值(Long)类型,转换失败返回-1。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Long数值。</returns>
  public static long ToLong(object obj)
  {
   try
   {
    return long.Parse(ToObjectString(obj));
   }
   catch
   { return -1L; }
  }
  /// <summary>
  /// 将对象转换为数值(Long)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Long数值。</returns>
  public static long ToLong(object obj,long returnValue)
  {
   try
   {
    return long.Parse(ToObjectString(obj));
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 将对象转换为数值(Decimal)类型,转换失败返回-1。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Decimal数值。</returns>
  public static decimal ToDecimal(object obj)
  {
   try
   {
    return decimal.Parse(ToObjectString(obj));
   }
   catch
   { return -1M; }
  }

  /// <summary>
  /// 将对象转换为数值(Decimal)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Decimal数值。</returns>
  public static decimal ToDecimal(object obj,decimal returnValue)
  {
   try
   {
    return decimal.Parse(ToObjectString(obj));
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 将对象转换为数值(Double)类型,转换失败返回-1。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Double数值。</returns>
  public static double ToDouble(object obj)
  {
   try
   {
    return double.Parse(ToObjectString(obj));
   }
   catch
   { return -1; }
  }

  /// <summary>
  /// 将对象转换为数值(Double)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Double数值。</returns>
  public static double ToDouble(object obj,double returnValue)
  {
   try
   {
    return double.Parse(ToObjectString(obj));
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 将对象转换为数值(Float)类型,转换失败返回-1。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Float数值。</returns>
  public static float ToFloat(object obj)
  {
   try
   {
    return float.Parse(ToObjectString(obj));
   }
   catch
   { return -1; }
  }

  /// <summary>
  /// 将对象转换为数值(Float)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Float数值。</returns>
  public static float ToFloat(object obj,float returnValue)
  {
   try
   {
    return float.Parse(ToObjectString(obj));
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 将对象转换为数值(DateTime)类型,转换失败返回Now。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>DateTime值。</returns>
  public static DateTime ToDateTime(object obj)
  {
   try
   {
    DateTime dt = DateTime.Parse(ToObjectString(obj));
    if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
     return dt;
    return DateTime.Now;
   }
   catch
   { return DateTime.Now; }
  }

  /// <summary>
  /// 将对象转换为数值(DateTime)类型。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>DateTime值。</returns>
  public static DateTime ToDateTime(object obj,DateTime returnValue)
  {
   try
   {
    DateTime dt = DateTime.Parse(ToObjectString(obj));
    if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
     return dt;
    return returnValue;
   }
   catch
   { return returnValue; }
  }
  /// <summary>
  /// 从Boolean转换成byte,转换失败返回0。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Byte值。</returns>
  public static byte ToByteByBool( object obj )
  {
   string text = ToObjectString(obj).Trim();
   if( text == string.Empty)
    return 0;
   else
   {
    try
    {
     return (byte)(text.ToLower()=="true"?1:0);
    }
    catch
    {
     return 0;
    }
   }
  }

  /// <summary>
  /// 从Boolean转换成byte。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Byte值。</returns>
  public static byte ToByteByBool( object obj, byte returnValue )
  {
   string text = ToObjectString(obj).Trim();
   if( text == string.Empty)
    return returnValue;
   else
   {
    try
    {
     return (byte)(text.ToLower()=="true"?1:0);
    }
    catch
    {
     return returnValue;
    }
   }
  }
  /// <summary>
  /// 从byte转换成Boolean,转换失败返回false。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Boolean值。</returns>
  public static bool ToBoolByByte( object obj )
  {
   try
   {
    string s = ToObjectString(obj).ToLower();
    return s == "1" || s== "true"?true:false;
   }
   catch
   {
    return false;
   }
  }
  /// <summary>
  /// 从byte转换成Boolean。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <param name="returnValue">转换失败返回该值。</param>
  /// <returns>Boolean值。</returns>
  public static bool ToBoolByByte( object obj, bool returnValue )
  {
   try
   {
    string s = ToObjectString(obj).ToLower();
    return s == "1" || s== "true"?true:false;
   }
   catch
   {
    return returnValue;
   }
  }
  #endregion

  #region 数据判断
  /// <summary>
  /// 判断文本obj是否为空值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Boolean值。</returns>
  public static bool IsEmpty(string obj)
  {
   return ToObjectString(obj).Trim() == String.Empty ? true : false;
  }

  /// <summary>
  /// 判断对象是否为正确的日期值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Boolean。</returns>
  public static bool IsDateTime(object obj)
  {
   try
   {
    DateTime dt = DateTime.Parse(ToObjectString(obj));
    if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
     return true;
    return false;
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 判断对象是否为正确的Int32值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Int32值。</returns>
  public static bool IsInt(object obj)
  {
   try
   {
    int.Parse(ToObjectString(obj));
    return true;
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 判断对象是否为正确的Long值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Long值。</returns>
  public static bool IsLong(object obj)
  {
   try
   {
    long.Parse(ToObjectString(obj));
    return true;
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 判断对象是否为正确的Float值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Float值。</returns>
  public static bool IsFloat(object obj)
  {
   try
   {
    float.Parse(ToObjectString(obj));
    return true;
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 判断对象是否为正确的Double值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Double值。</returns>
  public static bool IsDouble(object obj)
  {
   try
   {
    double.Parse(ToObjectString(obj));
    return true;
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 判断对象是否为正确的Decimal值。
  /// </summary>
  /// <param name="obj">对象。</param>
  /// <returns>Decimal值。</returns>
  public static bool IsDecimal(object obj)
  {
   try
   {
    decimal.Parse(ToObjectString(obj));
    return true;
   }
   catch
   { return false; }
  }
  #endregion

  #region 数据操作
  /// <summary>
  /// 去除字符串的所有空格。
  /// </summary>
  /// <param name="text">字符串</param>
  /// <returns>字符串</returns>
  public static string StringTrimAll( string text )
  {
   string _text = ToObjectString(text);
   string returnText = String.Empty;
   char[] chars = _text.ToCharArray();
   for( int i=0;i<chars.Length;i++)
   {
    if( chars[i].ToString() != string.Empty)
     returnText += chars[i].ToString();
   }
   return returnText;
  }

  /// <summary>
  /// 去除数值字符串的所有空格。
  /// </summary>
  /// <param name="numricString">数值字符串</param>
  /// <returns>String</returns>
  public static string NumricTrimAll( string numricString )
  {
   string text = ToObjectString(numricString).Trim();
   string returnText = String.Empty;
   char[] chars = text.ToCharArray();
   for( int i=0;i<chars.Length;i++)
   {
    if( chars[i].ToString() == "+" || chars[i].ToString() == "-" || IsDouble( chars[i].ToString()) )
     returnText += chars[i].ToString();
   }
   return returnText;
  }

  /// <summary>
  /// 在数组中查找匹配对象类型
  /// </summary>
  /// <param name="array">数组</param>
  /// <param name="obj">对象</param>
  /// <returns>Boolean</returns>
  public static bool ArrayFind(Array array,object obj)
  {
   bool b = false;
   foreach(object obj1 in array)
   {
    if(obj.Equals(obj1))
    {
     b = true;
     break;
    }
   }
   return b;
  }

  /// <summary>
  /// 在数组中查找匹配字符串
  /// </summary>
  /// <param name="array">数组</param>
  /// <param name="obj">对象</param>
  /// <param name="unUpLower">是否忽略大小写</param>
  /// <returns>Boolean</returns>
  public static bool ArrayFind(Array array,string obj,bool unUpLower)
  {
   bool b = false;
   foreach(string obj1 in array)
   {
    if(!unUpLower)
    {
     if(obj.Trim().Equals(obj1.ToString().Trim()))
     {
      b = true;
      break;
     }
    }
    else
    {
     if(obj.Trim().ToUpper().Equals(obj1.ToString().Trim().ToUpper()))
     {
      b = true;
      break;
     }
    }
   }
   return b;
  }
  /// <summary>
  /// 替换字符串中的单引号。
  /// </summary>
  /// <param name="inputString">字符串</param>
  /// <returns>String</returns>
  public static string ReplaceInvertedComma( string inputString )
  {
   return inputString.Replace("‘","‘‘");
  }

  /// <summary>
  /// 判断两个字节数组是否具有相同值.
  /// </summary>
  /// <param name="bytea">字节1</param>
  /// <param name="byteb">字节2</param>
  /// <returns>Boolean</returns>
  public static bool CompareByteArray(byte[] bytea,byte[] byteb)
  {
   if(null == bytea || null == byteb)
   {
    return false;
   }
   else
   {
    int aLength = bytea.Length;
    int bLength = byteb.Length;
    if(aLength != bLength)
     return false;
    else
    {
     bool compare = true;
     for(int index = 0; index < aLength; index++)
     {
      if(bytea[index].CompareTo(byteb[index]) != 0)
      {
       compare = false;
       break;
      }
     }
     return compare;
    }
   }
  }

  /// <summary>
  /// 日期智能生成。
  /// </summary>
  /// <param name="inputText">字符串</param>
  /// <returns>DateTime</returns>
  public static string BuildDate( string inputText )
  {
   try
   {
    return DateTime.Parse( inputText ).ToShortDateString();
   }
   catch
   {
    string text = NumricTrimAll( inputText );
    string year = DateTime.Now.Year.ToString();
    string month = DateTime.Now.Month.ToString();
    string day = DateTime.Now.Day.ToString();
    int length = text.Length;
    if( length == 0 )
     return String.Empty;
    else
    {
     if( length<=2 )
      day = text;
     else if( length<=4 )
     {
      month = text.Substring(0,2);
      day = text.Substring(2,length-2);
     }
     else if( length<=6 )
     {
      year = text.Substring(0,4);
      month = text.Substring(4,length-4);
     }
     else if( length>6)
     {
      year = text.Substring(0,4);
      month = text.Substring(4,2);
      day = text.Substring(6,length-6);
     }
     try
     {
      return DateTime.Parse( year+"-"+month+"-"+day ).ToShortDateString();
     }
     catch
     {
      return String.Empty;
     }
    }
   }
  }

  /// <summary>
  /// 检查文件是否真实存在。
  /// </summary>
  /// <param name="path">文件全名（包括路径）。</param>
  /// <returns>Boolean</returns>
  public static bool IsFileExists(string path)
  {
   try
   {
    return File.Exists(path);
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 检查目录是否真实存在。
  /// </summary>
  /// <param name="path">目录路径.</param>
  /// <returns>Boolean</returns>
  public static bool IsDirectoryExists(string path)
  {
   try
   {
    return Directory.Exists(Path.GetDirectoryName(path));
   }
   catch
   { return false; }
  }

  /// <summary>
  /// 查找文件中是否存在匹配行。
  /// </summary>
  /// <param name="fi">目标文件.</param>
  /// <param name="lineText">要查找的行文本.</param>
  /// <param name="lowerUpper">是否区分大小写.</param>
  /// <returns>Boolean</returns>
  public static bool FindLineTextFromFile(FileInfo fi,string lineText,bool lowerUpper)
  {
   bool b = false;
   try
   {
    if(fi.Exists)
    {
     StreamReader sr=new StreamReader(fi.FullName);
     string g = "";
     do
     {
      g=sr.ReadLine();
      if(lowerUpper)
      {
       if(ToObjectString(g).Trim() == ToObjectString(lineText).Trim())
       {
        b = true;
        break;
       }
      }
      else
      {
       if(ToObjectString(g).Trim().ToLower() == ToObjectString(lineText).Trim().ToLower())
       {
        b = true;
        break;
       }
      }
     }
     while(sr.Peek()!=-1);
     sr.Close();
    }
   }
   catch
   { b =false; }
   return b;
  }

  /// <summary>
  /// 判断父子级关系是否正确。
  /// </summary>
  /// <param name="table">数据表。</param>
  /// <param name="columnName">子键列名。</param>
  /// <param name="parentColumnName">父键列名。</param>
  /// <param name="inputString">子键值。</param>
  /// <param name="compareString">父键值。</param>
  /// <returns></returns>
  public static bool IsRightParent(DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
  {
   ArrayList array = new ArrayList();
   SearchChild(array,table,columnName,parentColumnName,inputString,compareString);
   return array.Count == 0;
  }

  // 内部方法
  private static void SearchChild(ArrayList array,DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
  {
   DataView view = new DataView(table);
   view.RowFilter = parentColumnName+"=‘"+ReplaceInvertedComma(inputString.Trim())+"‘";//找出所有的子类。
   //查找表中的数据的ID是否与compareString相等，相等返回 false;不相等继续迭代。
   for(int index = 0 ;index < view.Count;index ++)
   {
    if(Utility.ToObjectString(view[index][columnName]).ToLower() == compareString.Trim().ToLower())
    {
     array.Add("1");
     break;
    }
    else
    {
     SearchChild(array,table,columnName,parentColumnName,Utility.ToObjectString(view[index][columnName]),compareString);
    }
   }
  }

#endregion

#region 日期

        /// <summary>
        /// 格式化日期类型，返回字符串
        /// </summary>
        /// <param name="dtime">日期</param>
        /// <param name="s">日期年月日间隔符号</param>
        /// <returns></returns>
  public static String Fomatdate(DateTime dtime,String s)
  {
   String datestr="";
   datestr=dtime.Year.ToString() + s + dtime.Month.ToString().PadLeft(2,‘0‘)+ s +dtime.Day.ToString().PadLeft(2,‘0‘);
   return datestr;
  }

        /// <summary>
        /// 返回日期差
        /// </summary>
        /// <param name="sdmin">开始日期</param>
        /// <param name="sdmax">结束日期</param>
        /// <returns>日期差：负数为失败</returns>
  public static int Datediff(DateTime sdmin,DateTime sdmax)
  {
   try
   {
    double i=0;
    while(sdmin.AddDays(i)<sdmax)
    {
     i++;
    }
    return Utility.ToInt(i);
   }
   catch
   {
       return -1;
   }
  }

        /// <summary>
        /// 返回日期差
        /// </summary>
        /// <param name="sdmin">开始日期</param>
        /// <param name="sdmax">结束日期</param>
        /// <returns>日期差：负数为失败</returns>
  public static int Datediff(String sdmin,String sdmax)
  {
   try
   {
    DateTime dmin;
    DateTime dmax;
    dmin=DateTime.Parse(sdmin);
    dmax=DateTime.Parse(sdmax);
    double i=0;
    while(dmin.AddDays(i)<dmax)
    {
     i++;
    }
    return Utility.ToInt(i);
   }
   catch
   {
       return -1;
   }
  }

#endregion

#region 转换用户输入

  /// <summary>
  /// 将用户输入的字符串转换为可换行、替换Html编码、无危害数据库特殊字符、去掉首尾空白、的安全方便代码。
  /// </summary>
  /// <param name="inputString">用户输入字符串</param>
  public static string ConvertStr(string inputString)
  {
   string retVal=inputString;
   //retVal=retVal.Replace("&","&");
   retVal=retVal.Replace("\"",""");
   retVal=retVal.Replace("<","<");
   retVal=retVal.Replace(">",">");
   retVal=retVal.Replace(" "," ");
   retVal=retVal.Replace(" ","  ");
   retVal=retVal.Replace("\t","  ");
   retVal=retVal.Replace("\r", "<br>");
   return retVal;
  }

  public static string InputText(string inputString)
  {
   string retVal=inputString;
   retVal= ConvertStr(retVal);
   retVal=retVal.Replace("[url]", "");
   retVal=retVal.Replace("[/url]", "");
   return retVal;
  }

        /// <summary>
        /// 将html代码显示在网页上
        /// </summary>
        /// <param name="inputString"></param>
        /// <returns></returns>
  public static string OutputText(string inputString)
  {
   string retVal=System.Web.HttpUtility.HtmlDecode(inputString);
   retVal=retVal.Replace("<br>","");
   retVal=retVal.Replace("&amp","&;");
   retVal=retVal.Replace(""","\"");
   retVal=retVal.Replace("<","<");
   retVal=retVal.Replace(">",">");
   retVal=retVal.Replace(" "," ");
   retVal=retVal.Replace("  "," ");
   return retVal;
  }

  public static string ToUrl(string inputString)
  {
   string retVal=inputString;
   retVal= ConvertStr(retVal);
   return Regex.Replace(retVal,@"\[url](?<x>[^\]]*)\[/url]",@"<a href=""$1"" target=""_blank"">$1</a>",RegexOptions.IgnoreCase);
  }

  public static string GetSafeCode(string str)
  {
     str=str.Replace("‘","");
     str=str.Replace(char.Parse("34"),‘ ‘);
     str=str.Replace(";","");
   return str;
  }

#endregion

//#region 弹出框

        ///// <summary>
        ///// 服务器端弹出alert对话框
        ///// </summary>
        ///// <param name="str_Message">提示信息,例子："请输入您姓名!"</param>
        ///// <param name="page">Page类</param>
        //public static void Alert(string str_Message,Page page)
        //{
        //    page.RegisterStartupScript("","<script>alert(‘"+str_Message+"‘);</script>");
        //}
        ///// <summary>
        ///// 服务器端弹出alert对话框
        ///// </summary>
        ///// <param name="str_Ctl_Name">获得焦点控件Id值,比如：txt_Name</param>
        ///// <param name="str_Message">提示信息,例子："请输入您姓名!"</param>
        ///// <param name="page">Page类</param>
        //public static void Alert(string str_Ctl_Name,string str_Message,Page page)
        //{
        //    page.RegisterStartupScript("","<script>alert(‘"+str_Message+"‘);document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>");
        //}
        ///// <summary>
        ///// 服务器端弹出confirm对话框,该函数有个弊端,必须放到响应事件的最后,目前没有妥善解决方案
        ///// </summary>
        ///// <param name="str_Message">提示信息,例子："您是否确认删除!"</param>
        ///// <param name="btn">隐藏Botton按钮Id值,比如：btn_Flow</param>
        ///// <param name="page">Page类</param>
        //public static void Confirm(string str_Message,string btn,Page page)
        //{
        //    page.RegisterStartupScript("","<script> if (confirm(‘"+str_Message+"‘)==true){document.forms(0)."+btn+".click();}</script>");
        //}
        ///// <summary>
        ///// 服务器端弹出confirm对话框,询问用户准备转向相应操作，包括“确定”和“取消”时的操作
        ///// </summary>
        ///// <param name="str_Message">提示信息，比如："成功增加数据,单击\"确定\"按钮填写流程,单击\"取消\"修改数据"</param>
        ///// <param name="btn_Redirect_Flow">"确定"按钮id值</param>
        ///// <param name="btn_Redirect_Self">"取消"按钮id值</param>
        ///// <param name="page">Page类</param>
        //public static void Confirm(string str_Message,string btn_Redirect_Flow,string btn_Redirect_Self,Page page)
        //{
        //    page.RegisterStartupScript("","<script> if (confirm(‘"+str_Message+"‘)==true){document.forms(0)."+btn_Redirect_Flow+".click();}else{document.forms(0)."+btn_Redirect_Self+".click();}</script>");
        //}

//#endregion

  /// <summary>
  /// 设置绑定到DataGrid的DataTable的记录行数，如不够则添加空行
  /// </summary>
  /// <param name="myDataTable">数据表</param>
  /// <param name="intPageCount">DataGrid分页时每页行数</param>
  public static void SetTableRows(DataTable myDataTable,int intPageCount)
  {
   try
   {
    int intTemp=myDataTable.Rows.Count%intPageCount;
    if ((myDataTable.Rows.Count==0) || (intTemp!=0))
    {
     for(int i=0;i<(intPageCount-intTemp);i++)
     {
      DataRow myDataRow=myDataTable.NewRow();
      myDataTable.Rows.Add(myDataRow);
     }
    }
   }
   catch
   {
    throw;
   }
  }

        public static string GetGuid(string guid)
        {
            return guid.Replace("-", "");
        }

        public static string ReadConfig(string filePath)
        {
            return System.Configuration.ConfigurationManager.AppSettings[filePath];
        }

        #region   字符串长度区分中英文截取
        /// <summary>
        /// 截取文本，区分中英文字符，中文算两个长度，英文算一个长度
        /// </summary>
        /// <param name="str">待截取的字符串</param>
        /// <param name="length">需计算长度的字符串</param>
        /// <returns>string</returns>
        public static string GetSubString(string str, int length)
        {
            string temp = str;
            int j = 0;
            int k = 0;
            for (int i = 0; i < temp.Length; i++)
            {
                if (Regex.IsMatch(temp.Substring(i, 1), @"[\u4e00-\u9fa5]+"))
                {
                    j += 2;
                }
                else
                {
                    j += 1;
                }
                if (j <= length)
                {
                    k += 1;
                }
                if (j > length)
                {
                    return temp.Substring(0, k) + "...";
                }
            }
            return temp;
        }
        #endregion
}
}

//该代码片段来自于: http://www.sharejs.com/codes/csharp/8604

C#常用方法类库：数据类型,布布扣,bubuko.com

C#常用方法类库：数据类型

原文：http://www.cnblogs.com/lbs8/p/3658947.html

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