Question

目前我有2张表格。 Form1有一些标签控件。我想关闭Form2的标签。 Form1是MDI形式。 Form2是儿童形式。 Form2位于Form1的标签页中。我只想将关闭按钮放入Form2以关闭Form1中的标签页。

Form2:

private void btnClose_Click(object sender, EventArgs e)
{
    Form1 frm = new Form1();
    frm.tabControl1.TabPages.Remove(frm.tabPage1); 
}

此代码没有错误，但在vs2010中不起作用。还尝试使用RemoveAt，RemoveByKey。结果是一样的。

注意：我解决了从Form1到Form2以编程方式添加按钮的问题。

Form1;

Button btn = new Button();
btn.Text = "X";
btn.Width = 23;
btn.Height = 23;
btn.FlatStyle = FlatStyle.Flat;
btn.Location = new Point(2, 3);
Form2 frm = new Form2();
frm.Controls.Add(btn);

Answer 1

public class Form1 : Form
{
    //Delegate stuff for performing on UI thread.
    private delegate void TabPageDelegate(TabPage tab);
    private void RemoveTabOnUi(TabPage tab)
    {
        tabControl1.TabPages.RemoveAt(tab);
    }
    //internal method that will be accessible to other members of this namespace.
    internal void RemoveTab(TabPage tab)
    {
        //Do this action on UI delegate.
        this.Invoke(new TabPageDelegate(RemoveTabOnUi), tab);
    }

    //... Form1 Stuff
}
public class Form2 : Form
{
    public Form2()
    {
       //Add event to the closing event handler
       this.Closing += OnClosing;
    }
    private void OnClosing(object sender, EventArgs e)
    {
       //Check to make sure that MdiParent and Parent are correct
       if(null != this.MdiParent && this.MdiParent is Form1 && 
              null != this.Parent && this.Parent is TabPage)
       {
           //Calls the Form1().RemoveTab() internal method 
           ((Form1)this.MdiParent).RemoveTab((TabPage)this.Parent);
       }
    }

    //... Form2 Stuff
}

从另一个表单中删除控件

1 个答案: