使用tag属性从面板中删除动态添加的控件 [英] removing the dynamical added control from the panel using tag property

问题描述

我有一个带有按钮的窗体，当点击按钮时它会动态生成控件，还会添加一个动态生成的按钮，这样它就会删除符合条件的控件，意味着一边按钮，一排单击按钮时我的代码将被删除

i have windows form which have a button, when button is clicked it dynamically generated controls, also a button which is dynamically generated is added so that it will remove the controls which are in line, means aside the button, a row of control will be removed when button clicked my code is

int c = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            int v;
            v = c++;
            panel1.VerticalScroll.Value = VerticalScroll.Minimum;

            Button btn = new Button();
            btn.Name = "btn" + v;
            btn.Text = "Remove";
            btn.Location = new Point(750, 5 + (30 * v));
            btn.Click += new EventHandler(btn_Click);

            ComboBox combo = new ComboBox();
            combo.Name = "combobox" + v;
            combo.Location = new Point(30, 5 + (30 * v));
            combo.Tag = btn;

            ComboBox combo2 = new ComboBox();
            combo2.Name = "combobox2" + v;
            combo2.Location = new Point(170, 5 + (30 * v));
            combo2.Tag = btn;

            TextBox txt = new TextBox();
            txt.Name = "txtbx" + v;
            txt.Location = new Point(300, 5 + (30 * v));
            txt.Tag = btn;

            TextBox txt2 = new TextBox();
            txt2.Name = "txtbx2" + v;
            txt2.Location = new Point(450, 5 + (30 * v));
            txt2.Tag = btn;

            TextBox txt3 = new TextBox();
            txt3.Name = "txtbx3" + v;
            txt3.Location = new Point(600, 5 + (30 * v));
            txt3.Tag = btn;

            panel1.Controls.Add(combo);
            panel1.Controls.Add(btn);
            panel1.Controls.Add(txt);
            panel1.Controls.Add(combo2);
            panel1.Controls.Add(txt2);
            panel1.Controls.Add(txt3);   
        }
        private void btn_Click(object sender, EventArgs e)// this is the dynamically added button''s event which will remove the combobox and textbox
        {
            Button btnh = sender as Button;
            foreach (Control item in panel1.Controls.OfType<TextBox>())
            {
                if (item.Tag == sender || item == sender)
                    panel1.Controls.Remove(item);
            }
            foreach (Control item in panel1.Controls.OfType<ComboBox>())
            {
                if (item.Tag == sender || item == sender)
                    panel1.Controls.Remove(item);
            }
            panel1.Controls.Remove(btnh);
        }

我的错误是什么，但问题是dosnt删除了它控制的所有控件，我不知道我的代码简单易行的问题但我不知道它缺少哪里

my error is nothing but the problem is it dosnt removes all the controls it leaves controls and i dont know whats the problem my code is simple and easy but i dont know where it lacks

推荐答案

这是你能做的另一件好事。



而不是Panel使用，TableLayoutPanel，因为你说排列控件就像逐行一样。



说

Line1 - 你有一套TextBox ，ComboBox和按钮

Line2 - 包含另一组TextBox，ComboBox和Buttons



放置一个包含1行和1列的TableLayoutPanel

将Panel1控件放在Row（0），Column（0）位置并设置其Dock状态 - FILL



在Row放置另一个Panel2控件（1）列（0）位置并设置其停靠状态 - 填写



使用Panel1.Clear删除您所用语言的第1行中的所有控件。



保持Panel2中的控件就是这样。未触动!!!

Here is the another best thing you can do.

instead of Panel use, TableLayoutPanel since you said the arrangement controls is like line by line.

say
Line1 - you have set of TextBox,ComboBox and Buttons
Line2 - contains another set of TextBox,ComboBox and Buttons

Place a TableLayoutPanel with 1 row and 1 column
Place a Panel1 Control at Row(0),Column(0) position and set its Dock status - FILL

Place another Panel2 Control at Row(1) Column(0) position and set its dock status - FILL

use Panel1.Clear to remove all the controls in Line 1 in your language.

keep the controls in Panel2 as such.Untouched!!!

显然，这并不是最好的方法，即使你没有犯错。您正在寻找要删除的控件，对吧？创建后在标签中引用它。什么标签？在点击时已经知道的东西：按钮。例如：

It is not a best way, apparently, even if you did not make a mistake in it. You are looking for a control to be removed, right? Make a reference to it a tag after creation. A tag of what? Of something which is already known at the moment of the click: the button. For example:

ComboBox aComboBoxToBeRemovedLater = new ComboBox();

//...

Button aRemovingButton = new Button();
aRemovingButton.Text = "&Remove";
aRemovingButton.Tag = aComboBoxToBeRemovedLater;

aRemovingButton.Click += (sender, eventArgs) => {
    Button thisButton = (Button)sender;
    Control controlToRemove = (Control)thisButton.Tag;
    thisButton.Parent.Controls.Remove(controlToRemove);
    //... maybe even remove the button itself, adjust layout, etc...
} //aRemovingButton.Click

//...

// add the button, the combo box and other controls to the parent here

-SA

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