关于字符串截取问题简单说明

/// <summary>
/// 返回指定的字符串
/// </summary>
/// <param name="Length">要显示字符长度</param>
/// <param name="target">要截断的字符串</param>
/// <param name="sign">拼接的字符</param>
/// <returns>string</returns>
public static string GetdisplayStr(int Length, string target, string sign)
{

if (target == null)
{
return "";
}

//if (target.Length < Length)
//{
// return target;
//}
int iIndex = 0;

string result = "";
char[] chart = target.ToCharArray();
for (int i = 0; i < Length*2; iIndex++)
{
if (iIndex >= target.Length)
break;

if (System.Text.UnicodeEncoding.Unicode.GetBytes(chart[iIndex].ToString())[1] == byte.Parse("0"))
{
//char的byte数组由[0][1]高低位组成    数字、字母的平[1]为0
result += chart[iIndex];
i++;
}
else
{
result += chart[iIndex];
i += 2;
//result += sign;
//break;
}
}
//添加未显示完成标识
if(iIndex < chart.Length)
result += sign;

return result;
}