C＃如何获取控制哪个修饰符是私有的

Question

i have a custom control in a form which is private .

In the other form i have code like this

foreach(Form f in Application.OpenForms)

one of the forms is Formthatcontaincontrols ,

Formthatcontaincontrols contains the custom control which is private , i need to access that customcontrol from form "f"

Answer 1

You could expose the control via public property:

In Formthatcontaincontrols

public TheCustomControlYouWant TheCustomControl
{
    get { return this.CustomControl; }
}

Then you can access this property:

foreach(Formthatcontaincontrols f in Application.OpenForms.OfType<Formthatcontaincontrols>())
{
    TheCustomControlYouWant ctrl = f.TheCustomControl;
}

Answer 2

Please do not expose implementation details when using controls.

From the perspective of the consumer of your parent custom control ( Formthatcontaincontrols ), implementation details should be hidden.

I assume you need to access some kind of property which is important for the consumer of the Formthatcontaincontrols .

I advise just to expose this property and let the control itself find the relevant child and access the inner property defined in the child control.

You can find Formthatcontaincontrols using the solution pasted by @Tim Schmelter.

Answer 3

You can explore all the controls in the form:

private List<T> FindControls<T>(Control.ControlCollection controls) where T: Control
{
    List<T> list = new List<T>();
    foreach (Control control in controls)
    {
        var matched = control as T;
        if (matched != null)
            list.Add(matched);
        else
            list.AddRange(FindControls<T>(control.Controls));
    }
    return list;
}

For example, you can search all buttons with this:

foreach (var btn in FindControls<Button>(yourForm.Controls))
{
    Trace.WriteLine(btn.Name);
}