如何识别查询字符串名称是否包含空格？ [英] How to identify that querystring name contain space?

问题描述

Ex: sitename/sample.aspx?username=''&userid=''

cs file

string Username = "";
if (Request.QueryString["username"] != null)      
{
    Username = Request.QueryString["username"].ToString();
}
string userid = "";
if (Request.QueryString["userid"] != null)      
{
   userid = Request.QueryString["userid"].ToString();
}

If I use/pass 'username' or 'Username',both get check it is not case sensative.But if user pass like following

Ex: sitename/sample.aspx?username =''&userid=''

I want to restict it.How I check that querystring name contain space?

我尝试过：

What I have tried:

string userid = "";
if (Request.QueryString["userid"] != null)      
{
   userid = Request.QueryString["userid"].ToString();
}

推荐答案

如果您尝试捕获任何仅限空格的查询字符串，您始终可以将查询字符串修剪为摆脱前导和尾随空格，然后在修剪后检查其长度，例如

If you are trying to catch any space-only query string, you can always trim the query string to get rid of leading and trailing spaces, then check for its length after trimming, e.g.

string userid = " ";
if(userid.Trim().Length == 0){
     Console.WriteLine("userid is empty");
}

可以帮助.........检查

Might help......... Check with

string username="";
if(!String.IsNullOrEmpty(Request.QueryString["username"]))
{
  username=Request.QueryString["username"];
}
else
{
  Response.Write("Query String is null");
}

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