加号查询字符串 [英] Plus sign in query string

问题描述

我有一个使用 C# 和 asp.net 创建的 web 应用程序.我在查询字符串中放置了一个带有加号 (+) 的参数值.但是加号消失了.

I have a webapp created using C# and asp.net. I placed a parameter value in the querystring with a plus(+) sign. But the plus sign disappear.

如何在查询字符串中包含加号(+)而不消失?

How can I include the plus sign(+) in the query string without disappearing?

请指教.

谢谢.

使用 UrlEncode 添加代码

added code with UrlEncode

string str = Server.UrlEncode(Requery.QueryString["new"]);

推荐答案

+ 符号在查询字符串中具有语义含义.它用于表示一个空间.另一个在查询字符串中具有语义重要性的字符是 &，它用于分隔查询字符串中的各种 var=value 对.

+ sign has a semantic meaning in the query string. It is used to represent a space. Another character that has semantic importance in the query string is & which is used to separate the various var=value pairs in the query string.

大多数服务器端脚本会在使用查询参数之前对其进行解码，以便 + 正确转换为空格.现在，如果您希望在查询字符串中出现文字 +，则需要改为指定 %2B.

Most server side scripts would decode the query parameters before using them, so that a + gets properly converted to a space. Now, if you want a literal + to be present in the query string, you need to specify %2B instead.

+ 符号被 URL 解码为一个空格.查询字符串中的 %2B 被 URL 解码为 + 号.

+ sign in the query string is URL-decoded to a space. %2B in the query string is URL-decoded to a + sign.

看两者的区别

http://www.google.com/search?q=foo+bar

和

http://www.google.com/search?q=foo%2Bbar

在上述示例中，Google 的服务器脚本对查询参数进行 URL 解码，然后使用它们进行搜索.

In the above examples, Google's server script is URL-decoding the query parameters and then using them to do the search.

URL 编码只不过是 % 符号后跟特殊字符的十六进制代码.例如，我们知道A的十六进制代码是0x41(十进制:65).试试这个:

URL-encoding is nothing but % sign followed by the hex-code of the special character. For example, we know that the hex code of A is 0x41 (decimal: 65). Try this:

http://www.google.com/search?q=%41

希望这能让 URL 编码变得清晰.

Hope this makes URL-encoding clear.

因此，如果您希望在 JavaScript 获取查询参数中带有 + 符号的 URL 时保留 + 符号，并且服务器端脚本将处理URL解码后的查询参数，您应该在使用发出HTTP get请求之前对URL中的查询参数进行URL编码，以便将所有+符号转换为%2B's 当请求到达服务器端脚本时.现在，当服务器端脚本对查询字符串进行 URL 解码时，所有 %2B 都会转换回 + 符号，这正是您想要的.

So, if you want the + sign to be preserved when a JavaScript is fetching a URL with + signs in its query parameters and a server side script would process the query parameters after URL-decoding it, you should URL-encode the query parameters in the URL before using issuing the HTTP get request so that all + signs are converted to %2B's when the request reaches the server side script. Now when the server side script URL-decodes the query string, all %2B's gets converted back to + signs which is what you want.

请参阅在 JavaScript 中编码 URL?，了解如何使用 JavaScript 对参数进行 URL 编码.那里讨论的简短回答:

See Encode URL in JavaScript? to learn how to URL-encode the parameters using JavaScript. Short answer from the discussion there:

var encodedURL = "http://example.com/foo.php?var=" + encodeURIComponent(param);

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