在项目中，有时候一些信息不便完全显示，只需要显示部分信息。现在提供一些隐藏敏感信息的操作方法，主要为对信息的截取操作：

1.指定左右字符数量,中间的*的个数和实际长度有关：

///<summary>///隐藏敏感信息///</summary>///<paramname="info">信息实体</param>///<paramname="left">左边保留的字符数</param>///<paramname="right">右边保留的字符数</param>///<paramname="basedOnLeft">当长度异常时，是否显示左边///<code>true</code>显示左边，<code>false</code>显示右边///</param>///<returns></returns>publicstaticstringHideSensitiveInfo(stringinfo,intleft,intright,boolbasedOnLeft=true){if(string.IsNullOrEmpty(info)){thrownewArgumentNullException(info);}varsbText=newStringBuilder();varhiddenCharCount=info.Length-left-right;if(hiddenCharCount>0){stringprefix=info.Substring(0,left),suffix=info.Substring(info.Length-right);sbText.Append(prefix);for(vari=0;i<hiddenCharCount;i++){sbText.Append("*");}sbText.Append(suffix);}else{if(basedOnLeft){if(info.Length>left&&left>0){sbText.Append(info.Substring(0,left)+"****");}else{sbText.Append(info.Substring(0,1)+"****");}}else{if(info.Length>right&&right>0){sbText.Append("****"+info.Substring(info.Length-right));}else{sbText.Append("****"+info.Substring(info.Length-1));}}}returnsbText.ToString();}

2.指定左右字符数量,中间的*的个数固定：

///<summary>///隐藏敏感信息///</summary>///<paramname="info">信息实体</param>///<paramname="left">左边保留的字符数</param>///<paramname="right">右边保留的字符数</param>///<paramname="basedOnLeft">当长度异常时，是否显示左边///<code>true</code>显示左边，<code>false</code>显示右边///<returns></returns>publicstaticstringHideSensitiveInfo1(stringinfo,intleft,intright,boolbasedOnLeft=true){if(string.IsNullOrEmpty(info)){thrownewArgumentNullException(info);}varsbText=newStringBuilder();varhiddenCharCount=info.Length-left-right;if(hiddenCharCount>0){stringprefix=info.Substring(0,left),suffix=info.Substring(info.Length-right);sbText.Append(prefix);sbText.Append("****");sbText.Append(suffix);}else{if(basedOnLeft){if(info.Length>left&&left>0){sbText.Append(info.Substring(0,left)+"****");}else{sbText.Append(info.Substring(0,1)+"****");}}else{if(info.Length>right&&right>0){sbText.Append("****"+info.Substring(info.Length-right));}else{sbText.Append("****"+info.Substring(info.Length-1));}}}returnsbText.ToString();}

3.“*”数量一定，设置为4个，按信息总长度的比例来取，默认左右各取1/3：

///<summary>///隐藏敏感信息///</summary>///<paramname="info">信息</param>///<paramname="sublen">信息总长与左子串（或右子串）的比例</param>///<paramname="basedOnLeft"/>当长度异常时，是否显示左边，默认true，默认显示左边///<code>true</code>显示左边，<code>false</code>显示右边///<returns></returns>publicstaticstringHideSensitiveInfo(stringinfo,intsublen=3,boolbasedOnLeft=true){if(string.IsNullOrEmpty(info)){thrownewArgumentNullException(info);}if(sublen<=1){sublen=3;}varsubLength=info.Length/sublen;if(subLength>0&&info.Length>(subLength*2)){stringprefix=info.Substring(0,subLength),suffix=info.Substring(info.Length-subLength);returnprefix+"****"+suffix;}if(basedOnLeft){varprefix=subLength>0?info.Substring(0,subLength):info.Substring(0,1);returnprefix+"****";}varsuffixs=subLength>0?info.Substring(info.Length-subLength):info.Substring(info.Length-1);return"****"+suffixs;}

4.隐藏右键详情

///<summary>///隐藏右键详情///</summary>///<paramname="email">邮件地址</param>///<paramname="left">邮件头保留字符个数，默认值设置为3</param>///<returns></returns>publicstaticstringHideEmailDetails(stringemail,intleft=3){if(string.IsNullOrEmpty(email)){thrownewArgumentNullException(email);}if(!System.Text.RegularExpressions.Regex.IsMatch(email,@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"))returnHideSensitiveInfo(email);varsuffixLen=email.Length-email.LastIndexOf('@');returnHideSensitiveInfo(email,left,suffixLen,false);}

在一些信息的隐藏操作，可以采用js实现，也可以采用jquery插件完成操作，但是在前台进行这样的操作，存在一些风险，在后台完成对字符的信息截取，可以很好的对信息进行保护。