我要评论本文实例讲述了c#按字节数截取字符串并在后面加上省略号...的方法，这是一个自定义的c#函数，函数的使用说明如下：
<param name="origstr">原始字符串</param> <param name="endindex">提取前endidex个字节</param> <returns></returns>
函数代码如下：
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;
}
以下所示示例也是根据字节数截取字符串的，只是这个函数后面不加省略号……
/// 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;
}
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