stringutil.cs

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using System;

namespace eInfo.common
{
	/// <summary>
	/// 字符串操作工具集
	/// </summary>
	public class StringUtil
	{					
		public StringUtil()
		{
			//
			// TODO: 在此处添加构造函数逻辑
			//			
		}

		/// <summary>
		/// 将指定位置的字符置为1
		/// </summary>
		/// <param name="sourceString"></param>
		/// <param name="index"></param>
		/// <returns></returns>
		public static string Set(string sourceString ,int index)
		{
			string returnString="";
			if((index<sourceString.Length)&&(index>=0))
            {
				string preString=sourceString.Substring(0,index) ;
                string endString=sourceString.Substring(index+1);
				returnString=preString+"1"+endString;

			 }
			return returnString;
		}

		/// <summary>
		///     获取某一字符串在字符串中出现的次数
		/// </summary>
		/// <param name="stringArray" type="string">
		///     <para>
		///         原字符串
		///     </para>
		/// </param>
		/// <param name="findString" type="string">
		///     <para>
		///         匹配字符串
		///     </para>
		/// </param>
		/// <returns>
		///     匹配字符串数量
		/// </returns>
		public static int GetStringCount(string sourceString,string findString)
		{
			int count = 0;	
			int findStringLength = findString.Length;
			string subString = sourceString;

			while(subString.IndexOf(findString)>=0)
			{
				subString = subString.Substring(subString.IndexOf(findString)+findStringLength);
				count += 1;
			}
			return count;
		}

		/// <summary>
		/// 按字节数取出字符串的长度
		/// </summary>
		/// <param name="strTmp">要计算的字符串</param>
		/// <returns>字符串的字节数</returns>
		public static int GetByteCount(string strTmp)
		{
			int intCharCount=0;
			for(int i=0;i<strTmp.Length;i++)
			{
				if(System.Text.UTF8Encoding.UTF8.GetByteCount(strTmp.Substring(i,1))==3)
				{
					intCharCount=intCharCount+2;
				}
				else
				{
					intCharCount=intCharCount+1;
				}
			}
			return intCharCount;
		}

	
	}
}