如何从网址中删除查询字符串参数？

Question

Assume I have the link http://www.somesite.com/file.aspx?a=1&b=2

And now I want to remove all the parameters, so it becomes:

http://www.somesite.com/file.aspx

Or I may want to remove only 1 of the parameters such as

http://www.somesite.com/file.aspx?b=2

Is there a way to do the above in C#? What is happening is that I am coming from another page with a parameter called edit in the url, but when the page does a post back, the edit parameter is still there, so it still thinks it is in edit mode. Example:

User A goes to page one.aspx and clicks on an edit link. They are taken to two.aspx?edit=true. During page load, it sees the the query string parameter edit is not null and it puts the contents in edit mode. Once the user is done editing, the page is refreshed, but the url is still two.aspx?edit=true and keeps the contents in edit mode, when in fact it should be two.aspx

Answer 1

Request.Querystring is read-only collection - You cannot modify that.

If you need to remove or change the param in querystring only way out is to trigger a new GET request with updated querystring - This means you will have to do Response.Redirect with updated URL. This will cause you lose the viewstate of the current page.

Answer 2

使用PostBackUrl属性，例如：

<asp:Button ID="DoneEditingButton" runat="server" Text="Done editing" PostBackUrl="~/two.aspx" />

Answer 3

当您完成编辑后，您正在进行回发，所以只需定义要发布到two.aspx的操作，而不是仅仅回发到自己，这样就会删除get参数。

Answer 4

如何检查Page.IsPostBack以查看当前请求是否为回发？

Answer 5

if you have only string, you can use:

strinULR.Split('?').First();

or

strinULR.Split('?').FirstOrDefault();

Answer 6

Late but you can do this to remove query string from URL without another GET Request. http://www.codeproject.com/Tips/177679/Removing-Deleting-Querystring-in-ASP-NET

Answer 7

Try something like this.

if (url.Contains("?"))
            url = url.Substring(0, url.IndexOf("?"));

In this example, I'm checking if the url even contains a query string, and if it does, subtracting getting the "left part" of the string prior to the ?.