WinForm小知识点总结

1：CheckBox（全选，反选）容器内或指定容器内

 foreach (Control ctl in this.Controls)    //this.groupBox1.Controls
            {
                if (ctl is CheckBox)
                {
                    CheckBox ck = ctl as CheckBox;
                    if (ck!=null)
                    {
                        ck.Checked = true;    // ck.Checked = !ck.Checked;
                    }
                }
            }

2:清空某容器内的控件的内容

foreach (Control ctl in this.groupBox2.Controls)
            {
                if (ctl is CheckBox)
                {
                    CheckBox ck = ctl as CheckBox;
                    if (ck != null)
                    {
                        ck.Checked = false;
                    }
                }
                if (ctl is TextBox)
                {
                    TextBox tb = ctl as TextBox;
                    tb.Text = String.Empty;
                }
                if (ctl is RichTextBox)
                {
                    RichTextBox rtb = ctl as RichTextBox;
                    rtb.Text = String.Empty;
                }
            }