只允许检查一个复选框- asp.net c#。

I have a gridview where i have added checkboxes programmatically. i do as following when creating checkboxes inside a foreach loop, so that they trigger an event when checked,

我有一个gridview，其中我以编程方式添加了复选框。当在foreach循环中创建复选框时，我这样做，以便在选中时触发事件，

            cbGV = new CheckBox();
            cbGV.ID = "cbGV";
            cbGV.AutoPostBack = true;
            cbGV.CheckedChanged += new EventHandler(this.cbGV_CheckedChanged);

So basically when i want the event to be triggered, i have the following below,

所以基本上当我想要事件被触发时，我有以下几点，

    protected void cbGV_CheckedChanged(object sender, EventArgs e)
    {
        //gets the current checked checkbox.
        CheckBox activeCheckBox = sender as CheckBox;

        foreach (GridViewRow gvr in GridView1.Rows)
        {
            //this code is for finding the checkboxes in the gridview.

            CheckBox checkBox = ((CheckBox)gvr.FindControl("cbGV"));

            //so basically, right here i'm confused on how i should compare the if/else logic, how i should compare and disable every other checkbox if the current checkbox is checked. Any ideas gues?

        }

thanks for your answer in advance.

谢谢你事先的答复。

3 个解决方案

#1

First, you should only uncheck the other CheckBoxes(if that is what you want) when this CheckBox is checked and not when it was unchecked.

首先，您应该只在选中该复选框时取消选中其他复选框(如果这是您想要的)，而不是在选中该复选框时取消选中。

Second, you can use == operator to compare this checkbox with the others:

其次，可以使用== =运算符将该复选框与其他复选框进行比较:

CheckBox activeCheckBox = sender as CheckBox;
if(activeCheckBox.Checked)
{
    foreach (GridViewRow gvr in GridView1.Rows)
    {
        CheckBox checkBox = ((CheckBox)gvr.FindControl("cbGV"));
        checkBox.Checked = checkBox == activeCheckBox;
    }
}

#2

I did not try it, but here is one way to do it:

我没有尝试，但有一种方法:

protected void cbGV_CheckedChanged(object sender, EventArgs e)
    {
        //gets the current checked checkbox.
        CheckBox activeCheckBox = sender as CheckBox;
        BOOL flag = false;
        CheckBox selectedCheckBox;
        foreach (GridViewRow gvr in GridView1.Rows)
        {
            //this code is for finding the checkboxes in the gridview.

            CheckBox checkBox = ((CheckBox)gvr.FindControl("cbGV"));

            if (checkBox.Checked==true && flag==false)
                 {
                    flag = true;
                    selectedCheckBox = checkBox;
                 }
             else
                 {
                     if (checkBox != selectedCheckBox)
                          {
                          checkBox.Enabled = false;
                          checkBox.Checked = false;
                          }
                 }
            //so basically, right here i'm confused on how i should compare the if/else logic, how i should compare and disable every other checkbox if the current checkbox is checked. Any ideas gues?

        }

#3

CheckBox activeCheckBox = sender as CheckBox;
// to uncheck all check box
foreach (GridViewRow rw in GrdProc.Rows)
{
    CheckBox chkBx = (CheckBox)rw.FindControl("ChkCust");
    if (chkBx != activeCheckBox )
    {
       chkBx.Checked = false;
    }
}

#1