从 html 单选按钮获取值 - 在 aspx-c# 中
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Getting value from html radio button - in aspx-c#
提问by Nave Tseva
I have the following HTML source
我有以下 HTML 源代码
<form name="Register1" action="Register.aspx" id="registerform" method="post"
runat="server" style="margin-top: 15px;">
<input type="radio" name="Gender" value="male" />male
<input type="radio" name="Gender" value="female" />female
</form>
My question is how can I get the selected value to variable in the c# page?
我的问题是如何在 c# 页面中将选定的值设置为变量？
I tried this :
我试过这个：
Gender = Request.Form["Gender"].ToString();
But it didn't work...
但它没有用...
采纳答案by Manish Mishra
place your code like this:
像这样放置你的代码：
if (Request.Form["Gender"] != null)
{
string selectedGender = Request.Form["Gender"].ToString();
}
Note that Request.Form["Gender"]will be null if none of the RadioButtons are selected.
请注意，Request.Form["Gender"]如果没有选择任何 RadioButtons ，它将为 null。
see the markup below
请参阅下面的标记
<form id="form1" runat="server" method="post">
<input type="radio" name="Gender" value="male" id="test" checked="checked" />
male
<input type="radio" name="Gender" value="female" />female
<input type="submit" value="test" />
<asp:Button ID="btn" runat="server" Text="value" />
</form>
for both the buttons i.e input type="submit"and usual asp:button, Request.Form["Gender"]is going to have some value upon PostBack, provided, either of the RadioButtons is selected.
对于 ieinput type="submit"和 normal按钮，如果选择了 RadioButtons 中的任何一个asp:button，Request.Form["Gender"]都将在 上有一些值PostBack。
And yes, upon PostBackonly, i.e. when you hit either of the buttons and not on first load.
是的，PostBack仅在，即当您按下任一按钮而不是首次加载时。
回答by Linus Caldwell
Use a RadioButtonList
用一个 RadioButtonList
<asp:RadioButtonList id="RadioButtonList1" runat="server">
<asp:ListItem value="male">male</asp:ListItem>
<asp:ListItem value="female">female</asp:ListItem>
</asp:RadioButtonList>
and get the value with
并获得价值
RadioButtonList1.SelectedValue;
回答by V4Vendetta
To start with you will need the form posted the Form collection won't have anything on the page load, so suppose you have a button and you click to submit the form then in the click event handler you can get the selected value with the code you have tried.
首先，您需要发布表单，表单集合在页面加载时不会有任何内容，因此假设您有一个按钮并单击以提交表单，然后在单击事件处理程序中，您可以使用代码获取所选值你试过了。
I guess the collection is null hence the NullReference exception when you access it.
我猜该集合为空，因此访问它时会出现 NullReference 异常。
It is better to access it like
最好像这样访问它
if(!string.IsNullOrEmpty(Request.Form["Gender"]))
{
}
回答by Aqib Shehzad
if you are working with asp.net make sure that HTML control name by Request.Form contains these ct100$ with the name or id through which you are assessing. check the below example.
如果您正在使用 asp.net，请确保 Request.Form 的 HTML 控件名称包含这些 ct100$ 以及您正在评估的名称或 ID。检查下面的例子。
int rbratebyname = 0;
if (Request.Form["ctl00$ContentPlaceHolder1$rate"] != null)
{
rbratebyname = int.Parse(Request.Form["ctl00$ContentPlaceHolder1$rate"]);
}
