C＃Foreach改变某些对象属性？

Question

I have a panel with checkboxes and labels, I want to change all the checked states of the checkboxes when I click a button.

foreach (object x in panel1.Controls)
        {
            if (x.GetType() == typeof(CheckBox))
            {
                x.Checked = false; // problem is here;
                // (CheckBox)x.Checked = false; // also didn't work
            }
        }

I'm certain it's something simple but couldn't find how to resolve the issue. I was able to write the same procedure in vb.net but don't want to use that

Answer 1

您需要在整个转换操作周围加上括号：

((CheckBox)x).Checked = false;

Answer 2

You could definitely clean up your code a bit (as well as resolve the issue with parenthesis):

foreach(var x in panel1.Controls)
{
    var checkbox = x as Checkbox;
    if(checkbox != null) checkbox.Checked = false;
}

Answer 3

foreach(Checkbox box in panel1.Controls.OfType<CheckBox>())
{
  box.Checked = true;
}

Answer 4

Try

((CheckBox)x).Checked = false;

As you wrote it, the compiler understand

(CheckBox)(x.Checked) = false;

Answer 5

x仍然是一个对象，因此您需要将对象强制转换为复选框

((Checkbox)x).Checked = false;