////// 将指定字符串按指定长度进行剪切, /// /// 需要截断的字符串 /// 字符串的最大长度 /// 超过长度的后缀 ///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 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;elsereturn strTmp + endWith;}return oldStr;}