Get access to parent control from user control - C

Question

How do I get access to the parent controls of user control in C   winform   I am using the following code but it is not applicable on all types controls such as ListBox   Control   Co   this TopLevelControl Controls Find  label7   true   Co 0  Text    HelloText    Actually  I have to add items in Listbox placed on parent  Form  from a user control

User · Accepted Answer

Description

You can get the parent control using Control.Parent.

Sample

So if you have a Control placed on a form this.Parent would be your Form.

Within your Control you can do

Form parentForm = (this.Parent as Form);

More Information

MSDN: Control.Parent Property

Update after a comment by Farid-ur-Rahman (He was asking the question)

My Control and a listbox (listBox1) both are place on a Form (Form1). I have to add item in a listBox1 when user press a button placed in my Control.

You have two possible ways to get this done.

1. Use `Control.Parent

Sample

MyUserControl

    private void button1_Click(object sender, EventArgs e)
    {
        if (this.Parent == null || this.Parent.GetType() != typeof(MyForm))
            return;

        ListBox listBox = (this.Parent as MyForm).Controls["listBox1"] as ListBox;
        listBox.Items.Add("Test");
    }

or

2.

put a property public MyForm ParentForm { get; set; } to your UserControl
set the property in your Form
assuming your ListBox is named listBox1 otherwise change the name

Sample

MyForm

public partial class MyForm : Form
{
    public MyForm()
    {
        InitializeComponent();
        this.myUserControl1.ParentForm = this;
    }
}

MyUserControl

public partial class MyUserControl : UserControl
{
    public MyForm ParentForm { get; set; }

    public MyUserControl()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (ParentForm == null)
            return;

        ListBox listBox = (ParentForm.Controls["listBox1"] as ListBox);
        listBox.Items.Add("Test");

    }
}

User · Answer

A generic way to get a parent of a control that I have used is   public static T GetParentOfType lt T gt  this Control control        const int loopLimit   100     could have outside method     var current   control      var i   0       do               current   current Parent           if  current    null  throw new Exception  Could not find parent of specified type            if  i    gt  loopLimit  throw new Exception  Exceeded loop limit           while  current GetType      typeof T         return  T Convert ChangeType current  typeof T        It needs a bit of work  e g  returning null if not found or error      but hopefully could help someone   Usage   var parent   currentControl GetParentOfType lt TypeWanted gt       Enjoy

User · Answer

frmMain this Owner  MyListControl Items Add  abc      Make sure to provide access level you want at Modifiers properties other than Private for MyListControl at frmMain

User · Answer

Control has a property called Parent  which will give the parent control  http   msdn microsoft com en-us library system windows forms control parent aspx  eg Control p   this Parent

User · Answer

Not Ideal  but try this     Change the usercontrol to Component class  In the code editor   build the solution and remove all the code with errors  Related to usercontrols but not available in components so the debugger complains about it   Change the usercontrol back to usercontrol class     Now it recognises the name and parent property but shows the component as non-visual as it is no longer designable

User · Answer

You can use Control Parent to get the parent of the control or Control FindForm to get the first parent Form the control is on  There is a difference between the two in terms of finding forms  so one may be more suitable to use than the other       The control s Parent property value might not be the same as the Form   returned by FindForm method  For example  if a RadioButton control is   contained within a GroupBox control  and the GroupBox is on a Form    the RadioButton control s Parent is the GroupBox and the GroupBox   control s Parent is the Form

User · Answer

According to Ruskins answer and the comments here I came up with the following  recursive  solution   public static T GetParentOfType lt T gt  this Control control  where T   class       if  control  Parent    null          return null       if  control Parent is T parent          return parent       return GetParentOfType lt T gt  control Parent

User · Answer

If you want to get any parent  by any child control you can use this code  and when you find the UserControl Form Panel or others you can call  funnctions or set get values   Control myControl  this  while  myControl Parent    null         if  myControl Parent  null                myControl   myControl Parent          if   myControl Name    MyCustomUserControl                           MyCustomUserControl myControl  lblTitle Text    FOUND IT

User · Answer

You can get the Parent of a control via  myControl Parent   See MSDN  Control Parent

[c#] Get access to parent control from user control - C#

Description

Sample

More Information

Update after a comment by Farid-ur-Rahman (He was asking the question)

Sample

Sample

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