隐藏面板控制时，会显示子窗体

Question

我试图隐藏的parent Form2面板控制按钮被点击时GroupSelect childform打开另一个child form GroupExmStart，当这种GroupExmStart形式变得比panel4开放应该隐藏，当它关闭比应该是可见的，我试过下面的代码，但它不工作，也没有发生。我错在哪里，我该如何正确地做到这一点？

父窗体

public partial class Form2 : Form 
{ 
    public Control control 
    { 
     //using this I accessed panel4 in child form GroupSelect 
     get {return this.panel4; } 
    } 
} 

子窗体

public partial class GroupSelect : Form 
{ 
    private void button1_Click(object sender, EventArgs e) 
    { 
     Form2 frm2 = new Form2(lgnName); 
     frm2.panel4.Visible = false; 

     GroupExmStart grpexamfrm = new GroupExmStart(GrpID, DurationID, lgnName); 
     grpexamfrm.MdiParent = this.ParentForm; 
     //showing another child form and 
     grpexamfrm.Show(); 
    } 
} 

Answer 1

此代码的工作对我非常好

在父窗体

public Form2(string userName) 
     { 
     InitializeComponent();    
     panelHide = panel4; 
     } 
public static Panel panelHide = new Panel(); 

在GroupSelect子窗体

private void button1_Click(object sender, EventArgs e) 
     { 
      Form2.panelHide.Hide(); 
     } 

Answer 2

要创建新的窗口2，但我明白的问题侑父窗体是窗体2，所以你可以按照以下

做

private void button1_Click(object sender, EventArgs e) 
{ 
    var frm2 = this.Parent as Form2; 
    if(frm2 !=null) 
     frm2.control.Visible = false; 

    GroupExmStart grpexamfrm = new GroupExmStart(GrpID, DurationID,lgnName); 
    grpexamfrm.MdiParent = this.ParentForm; 
    grpexamfrm.Show();//showing another child form and 
}