根据字节数截取字符串(后面加省略号...)代码,CSharp代码库,德仔网

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【CSharp】根据字节数截取字符串(后面加省略号...)

作者:浩宇 / 发布于2015/8/25/ 1221

C#按字节数截取字符串(后面加省略号...)，这是一个自定义的C#函数，函数使用说明如下：


	/// <param name="origStr">原始字符串</param>
	/// <param name="endIndex">提取前endIdex个字节</param>
	/// <returns></returns>

	public static string GetSubString(string origStr, int endIndex)
	{
	 if (origStr == null || origStr.Length == 0 || endIndex < 0)
	 return "";
	 int bytesCount = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(origStr);
	 if (bytesCount > endIndex)
	 {
	 int readyLength = 0;
	 int byteLength;
	 for (int i = 0; i < origStr.Length; i++)
	 {
	 byteLength = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(new char[] { origStr[i] });
	 readyLength += byteLength;
	 if (readyLength == endIndex)
	 {
	 origStr = origStr.Substring(0, i + 1) + "...";
	 break;
	 }
	 else if (readyLength > endIndex)
	 {
	 origStr = origStr.Substring(0, i) + "...";
	 break;
	 }
	 }
	 }
	 return origStr;
	}

	

	以下也是根据字节数截取字符串的，这个是后面不加省略号&hellip;&hellip;

	/// 按字节数截取字符串(不带省略号)
	/// </summary>
	/// <param name="origStr">原始字符串</param>
	/// <param name="endIndex">提取前endIdex个字节</param>
	/// <returns></returns>
	public static string GetSub1String(string origStr, int endIndex)
	{
	 if (origStr == null || origStr.Length == 0 || endIndex < 0)
	 return "";
	 int bytesCount = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(origStr);
	 if (bytesCount > endIndex)
	 {
	 int readyLength = 0;
	 int byteLength;
	 for (int i = 0; i < origStr.Length; i++)
	 {
	 byteLength = System.Text.Encoding.GetEncoding("gb2312").GetByteCount(new char[] { origStr[i] });
	 readyLength += byteLength;
	 if (readyLength == endIndex)
	 {
	 origStr = origStr.Substring(0, i + 1);
	 break;
	 }
	 else if (readyLength > endIndex)
	 {
	 origStr = origStr.Substring(0, i);
	 break;
	 }
	 }
	 }
	 return origStr;
	}

试试其它关键字

　截取字符串　

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