我使用字符串URL得到URL =
  HttpContext.Current.Request.Url.AbsoluteUri;

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不要使用绝对URI 属性，它会给你一个字符串开放的，而不是使用网址属性直接，如：

  VAR的结果= System.Web.HttpUtility.ParseQueryString（HttpContext.Current.Request.Url.Query）;
 

然后就可以像提取每个参数：

  Console.WriteLine（结果[将把userid]）;
Console.WriteLine（结果[意见]）;
 

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有关其他情况下，当你有字符串 URI那么就不要使用字符串操作，而是使用乌里类。

 开放的URI =新的URI（@http://example.com/xyz/xyz.html?userid=xyz&comment=Comment）;
 

您也可以使用 TryCreate ，它并不在乌里无效的情况下，抛出的异常的方法。

 开放的URI;
如果（！Uri.TryCreate（@http://example.com/xyz/xyz.html?userid=xyz&comment=Comment，UriKind.RelativeOrAbsolute，出URI））
{
    //无效的URI
}
 

然后你可以使用 System.Web.HttpUtility.ParseQueryString 获取查询字符串参数：

  VAR的结果= System.Web.HttpUtility.ParseQueryString（uri.Query）;
 

I have an application where uses post comments. Security is not an issue. string url = http://example.com/xyz/xyz.html?userid=xyz&comment=Comment

What i want is to extract the userid and comment from above string. I tried and found that i can use IndexOf and Substring to get the desired code BUT what if the userid or comment also has = symbol and & symbol then my IndexOf will return number and my Substring will be wrong. Can you please find me a more suitable way of extracting userid and comment. Thanks.

I got url using string url = HttpContext.Current.Request.Url.AbsoluteUri;

Do not use AbsoluteUri property , it will give you a string Uri, instead use the Url property directly like:

var result = System.Web.HttpUtility.ParseQueryString(HttpContext.Current.Request.Url.Query);

and then you can extract each parameter like:

Console.WriteLine(result["userid"]);
Console.WriteLine(result["comment"]);

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For other cases when you have string uri then do not use string operations, instead use Uri class.

Uri uri = new Uri(@"http://example.com/xyz/xyz.html?userid=xyz&comment=Comment");

You can also use TryCreate method which doesn't throw exception in case of invalid Uri.

Uri uri;
if (!Uri.TryCreate(@"http://example.com/xyz/xyz.html?userid=xyz&comment=Comment", UriKind.RelativeOrAbsolute, out uri))
{
    //Invalid Uri
}

and then you can use System.Web.HttpUtility.ParseQueryString to get query string parameters:

 var result = System.Web.HttpUtility.ParseQueryString(uri.Query);