在 C# 中输出操纵的 QueryString
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Outputting a manipulated QueryString in C#
提问by Anthony Main
Using the following code I get a nice formatted string:
使用以下代码，我得到了一个很好的格式化字符串：
Request.QueryString.ToString
Gives me something like: &hello=worldµsoft=sucks
给了我类似的东西：&hello=worldµsoft=sucks
But when I use this code to clone the collection to another object (of the same type) I get the Type() back from the ToString() method instead.
但是，当我使用此代码将集合克隆到另一个对象（相同类型）时，我从 ToString() 方法中取回了 Type()。
System.Collections.Specialized.NameValueCollection variables = new System.Collections.Specialized.NameValueCollection(Request.QueryString);
if (!string.IsNullOrEmpty(variables["sid"]))
variables.Remove("sid");
Response.Write(variables.ToString());
Is there a tidier way to output it rather than looking and building the string manually?
是否有一种更整洁的方式来输出它而不是手动查找和构建字符串？
采纳答案by Igal Tabachnik
You can also use Reflector to extract the HttpValueCollectionclass into your own, and use it then.
您也可以使用 Reflector 将HttpValueCollection类提取到您自己的类中，然后使用它。
回答by Johannes H?drich
Why do you want to copy the QueryString collection into a new NameValueCollection?
为什么要将 QueryString 集合复制到新的 NameValueCollection 中？
if (!string.IsNullOrEmpty(Request.QueryString["sid"]))
Request.QueryString.Remove("sid");
Yes indeed, i am wrong, it is read only. So the essence is to use the Remove Method on your NameValuecollection:
是的，我错了，它是只读的。所以本质是在你的 NameValuecollection 上使用 Remove 方法：
System.Collections.Specialized.NameValueCollection variables = new System.Collections.Specialized.NameValueCollection(Request.QueryString);
if (!string.IsNullOrEmpty(variables["sid"]))
variables.Remove("sid");
回答by James Curran
Request.QueryString actually return a HttpValueCollection object (which unfortuately, is internal to System.Web so you can't you it).
Request.QueryString 实际上返回一个 HttpValueCollection 对象（不幸的是，它是 System.Web 的内部对象，因此您不能使用它）。
Nevertheless, HttpValueCollection is derived from NameValueCollection, and it's Remove() method remains intact, so you should be able to call Request.QueryString.Remove("sid");
尽管如此，HttpValueCollection 是从 NameValueCollection 派生的，它的 Remove() 方法保持不变，所以你应该能够调用 Request.QueryString.Remove("sid");
回答by Brian Schmitt
Because it is actually a special NVC that is of type HTTPValueCollection. So when you call .ToString on it, it knows how to format it correctly.
因为它实际上是一个 HTTPValueCollection 类型的特殊 NVC。所以当你调用 .ToString 时，它知道如何正确格式化它。
回答by Jimmy
If you don't absolutely need a NameValueCollection, A dictionary offers a lot of the same semantics:
如果你不是绝对需要 NameValueCollection，字典提供了很多相同的语义：
var variables = Request.QueryString.OfType<DictionaryEntry>()
.Where(entry => entry.Key != "sid")
.ToDictionary(entry => entry.Key, entry => entry.Value);
回答by Michele Bersini
HttpValueCollection is internal, but you can use "var" to declare it without extract it with reflector.
HttpValueCollection 是内部的，但您可以使用“var”来声明它，而无需使用反射器提取它。
var query = HttpUtility.ParseQueryString(Request.Url.Query);
query["Lang"] = myLanguage; // Add or replace param
string myNewUrl = Request.Url.AbsolutePath + "?" + query;
