Control.SetTopLevel(Boolean) Method

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Source:: Control.cs

Source:: Control.cs

Source:: Control.cs

Important

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Sets the control as the top-level control.

protected:
 void SetTopLevel(bool value);

protected void SetTopLevel(bool value);

member this.SetTopLevel : bool -> unit

Protected Sub SetTopLevel (value As Boolean)

Parameters

value: Boolean

true to set the control as the top-level control; otherwise, false.

Exceptions

InvalidOperationException

The value parameter is set to true and the control is an ActiveX control.

Exception

The GetTopLevel() return value is not equal to the value parameter and the Parent property is not null.

Remarks

If you call the SetTopLevel method of a Form and pass in a value of false, the form will not be visible until you call SetTopLevel again, passing in a value of true.

Applies to

Продукт	Версии
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop	3.0, 3.1, 5, 6, 7, 8, 9, 10

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