使用.NET在POST上动态地将查询参数附加到URL

I have a very simple html form that, upon submission, should redirect the user to another page. There's a field in the form, which value needs to be appended to the redirect Url (via query string) IF the user has entered a value.

我有一个非常简单的html表单，在提交后，应该将用户重定向到另一个页面。表单中有一个字段，如果用户输入了值，则需要将该值附加到重定向Url（通过查询字符串）。

So, if the user enters "hello" in the form, they would be redirected to "mysite.com?x=hello", else it would just direct to "mysite.com?x=". Currently my code is ignoring the IF statement within my POST, can anyone see what the issue is?

因此，如果用户在表单中输入“hello”，它们将被重定向到“mysite.com?x=hello”，否则它将直接指向“mysite.com?x=”。目前我的代码忽略了我的POST中的IF语句，谁能看到问题是什么？

Here's my code:

这是我的代码：

<form>
    <input type="text" id="test" name="test" />
    <input type="submit" value="Submit" />
</form>

if(IsPost){
    var x = Request.Form["test"].IsEmpty() ? false : true;

    if(x){
        x = "hello";
    }

    Response.Redirect("http://www.mysite.com?x=" + x);
}

2 个解决方案

#1

Your current code won't compile as you try to assign a string ("hello") to the boolean x (true / false), but you only assign it when x is false, i.e. when Request.Form["test"] is empty.

当您尝试将字符串（“hello”）分配给布尔值x（true / false）时，您的当前代码将无法编译，但您只在x为false时分配它，即当Request.Form [“test”]为空。

Try this:

尝试这个：

string redirectTo = Request.Form["test"];
if (string.IsNullOrEmpty(redirectTo))
{
    redirectTo = "hello";
}

Response.Redirect("http://www.mysite.com?x=" + HttpUtility.UrlEncode(redirectTo));

It's a bit unclear what you want exactly to happen from your question, but you must be able to figure it out from here. If you want to redirect to ?x= when the input is empty, simply remove the if block as Request.Form["not entered item"] will return null.

从你的问题中你想要发生什么事情有点不清楚，但你必须能够从这里弄明白。如果要重定向到？x =当输入为空时，只需删除if块，因为Request.Form [“not entered item”]将返回null。

As @ChrisK comments on your question, there are better ways of doing this.

正如@ChrisK对您的问题发表评论，有更好的方法可以做到这一点。

#2

You're checking IsPost but it should be IsPostBack.

你正在检查IsPost，但它应该是IsPostBack。

See this MSDN article for reference.

请参阅此MSDN文章以供参考。

#1