CheckedChanged事件未被触发

Question

在我WebForm我想要的总价格,当用户选中一个产品的改变,但我有这个问题,我的代码,

CheckedChanged当我检查时,事件没有触发CheckBox

它只在我点击Button(用作清除按钮)时触发,我没有在按钮事件中包含该代码!

这是我的代码:

public partial class _Default : System.Web.UI.Page
{
    int total = 0;
    String strtotal;

    protected void ckb1_CheckedChanged(object sender, EventArgs e)
    {            
        if (ckb1.Checked)
        {                
            total = total + 100;
            strtotal = total.ToString();
            lbl2.Text = strtotal;
        } 

    }

    protected void ckb2_CheckedChanged(object sender, EventArgs e)
    {
        if (ckb2.Checked)
        {
            total = total + 80;
            strtotal = total.ToString();
            lbl2.Text = strtotal;
        }
    }

    protected void ckb3_CheckedChanged(object sender, EventArgs e)
    {
        if (ckb3.Checked)
        {
            total = total + 70;
            strtotal = total.ToString();
            lbl2.Text = strtotal;
        }
    }

    protected void Button3_Click(object sender, EventArgs e)
    {
        TextBox1.Text = " ";
        ckb1.Checked = false;
        ckb2.Checked = false;
        ckb3.Checked = false;    
    }

}

Answer 1

所有ASP.NET服务器控件除外Button,Hyperlink并且LinkButton具有默认AutoPostBack属性false,因此您应该 AutoPostBack="true"在CheckBox:

<asp:CheckBox ID="ckb1" runat="server" AutoPostBack="true" OnCheckedChanged="ckb1_CheckedChanged" />

只有在我点击按钮时才会触发

正如我所说,这是因为默认情况下Button具有AutoPostBack属性,true因此在您选中CheckBox然后单击按钮后,CheckBox状态会自动回发到服务器.