复制代码 代码如下:

/// <summary>

/// 将指定字符串按指定长度进行剪切，

/// </summary>

/// <param name= "oldStr "> 需要截断的字符串 </param>

/// <param name= "maxLength "> 字符串的最大长度 </param>

/// <param name= "endWith "> 超过长度的后缀 </param>

/// <returns> 如果超过长度，返回截断后的新字符串加上后缀，否则，返回原字符串 </returns>

public static string StringTruncat(string oldStr, int maxLength, string endWith)

{

if (string.IsNullOrEmpty(oldStr))

// throw new NullReferenceException( "原字符串不能为空 ");

return oldStr + endWith;

if (maxLength < 1)

throw new Exception("返回的字符串长度必须大于[0] ");

if (oldStr.Length > maxLength)

{

string strTmp = oldStr.Substring(0, maxLength);

if (string.IsNullOrEmpty(endWith))

return strTmp;

else

return strTmp + endWith;

}

return oldStr;

}