.net 为什么在WinForm应用程序中创建组件类椭圆会在www.example.com中没有响应

我正在try 在WinForm应用程序中创建组件类椭圆形使得在www.example.com中没有响应

我在另一台电脑上试过了，还是一样

使其不响应并重新启动Visual Studio.密码有什么问题吗？请带我

谢谢

Imports System.ComponentModel
Imports System.Runtime.InteropServices

Public Class Ellipse
    Inherits Component

    <DllImport("gdi32.dll", EntryPoint:="CreateRoundRectRgn")>
    Private Shared Function CreateRoundRectRgn(ByVal nL As Integer, ByVal nT As Integer, ByVal nR As Integer, ByVal nB As Integer, ByVal nWidthEllipse As Integer, ByVal nHeightEllipse As Integer) As IntPtr
    End Function

    Private control As Control
    Private cornerRadius As Integer = 25
    Public Property TargetControl As Control
        Get
            Return control
        End Get
        Set(ByVal value As Control)
            control = value
            AddHandler control.SizeChanged, Sub(sender, eventArgs) control.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, control.Width, control.Height, cornerRadius, cornerRadius))
        End Set
    End Property
    Public Property CornerRedius As Integer
        Get
            Return CornerRedius
        End Get
        Set(ByVal value As Integer)
            CornerRedius = value
            If control IsNot Nothing Then
                control.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, control.Width, control.Height, cornerRadius, cornerRadius))
            End If
        End Set
    End Property
End Class

当我将corner radius值从0更改为25时，它变得没有响应，Visual Studio重新启动.