How to grab HTML elements in aspx.cs file (checkbox) C#

问题

Let's say I have I have something along the lines of (in my aspx file):

<input name="chk" id="cbox1" type="checkbox">
<input name="chk" id="cbox2" type="checkbox">
<input name="chk" id="cbox3" type="checkbox">
<input name="chk" id="cbox4" type="checkbox">

---

How would I be able to get the value of each element inside the .aspx.cs file?
Can I call something like GetElementsByName in C#?

回答1:

No, you can't, unless you will mark this controls as runat="server".

This is because in ASP.NET all static html became a Literal control with .Text property equal to your html. In this case it will be:

<asp:Literal>
    <input name="chk" id="cbox1" type="checkbox">
    <input name="chk" id="cbox2" type="checkbox">
    <input name="chk" id="cbox3" type="checkbox">
    <input name="chk" id="cbox4" type="checkbox">
</asp:Literal>

If you will mark any of elements as runat="server", you can access them from .Controls collection of the current page.

Or (as in other answer) you can use the server control (CheckBox or CheckBoxList) for such inputs

回答2:

You need add the attribute runat with the value server, lie so.

<input name="chk" id="cbox4" type="checkbox" runat="server">

Then you can do this.

var val = cbox4.value;

Hope this helps.

回答3:

Use this in the aspx file instead: <asp:CheckBox runat="server" ID="cbox1">

Then in your code behind, call cbox1.Checked to see if it is checked.

回答4:

You can also use this.Request.Form. Use it like this:

this.Request.Form["ElementID"].

回答5:

Using the runat="server"

<input name="cbox1" id="cbox1" runat="server" type="checkbox">

You can use it directly like:

cbox1.Checked

来源：https://stackoverflow.com/questions/6685176/how-to-grab-html-elements-in-aspx-cs-file-checkbox-c-sharp