OnCheckedChanged event not firing in GridView at a

问题:

I have a GridView with an asp CheckBox in a TemplateField. The TemplateField is defined as follows:

<asp:TemplateField HeaderText="HeaderName">
    <ItemTemplate>
        <asp:CheckBox ID="checkBoxId" runat="server" OnCheckedChanged="MyCheckChangedMethod" AutoPostBack="true"/>
    </ItemTemplate>
</asp:TemplateField>

When I run my web project with a breakpoint inside MyCheckChangedMethod and click the checkbox nothing happens. The breakpoint is not hit. My Visual Studio debugger is running.

Additionally, I have AutoEventWireup = True in my page defnition so I don't have to manually hook up the event. I have never had a problem doing it this way before. I have a button on the same page setup the exact same way with a click event and the breakpoint gets hit fine in that.

Any ideas?

回答1:

The postback event for the checkbox control won't fire correctly because it's within a GridView that mangles the ID of the control.

If you need the Checkbox to reflect data you can use the CheckBoxField object and bind that way.

If you need it perform an action for the row, you may want to look at the ButtonField object using the CommandName property and the RowCommand event.

There are ways to access the checkboxes within the GridView server side.

回答2:

You need to add AutoPostback = True in asp:CheckBox tag.

回答3:

The problem occurs when DataBind is called before the control event is firing. If you call DataBind in Page_Load put it in if (!isPostBack) {} and call DataBind in the event handler itself.

回答4:

try:

<asp:CheckBox  ID="checkBoxId" runat="server" AutoPostBack=true OnCheckedChanged="MyCheckChangedMethod"/>

Make sure that the aspx page has CodeFile="YOUR_FILE.aspx.cs" at the top.

Also see to it that your function MyCheckChangedMethod is defined as

Function should have object sender, EventArgs e.

public void MyCheckChangedMethod(object sender, EventArgs e)
{
  bool b = false;//your data here
}

Also make sure that the web.config has debug set to true (think already done).