使表单的背景变得透明

Question

我创建了一个无边框表单，然后将背景图像（PNG格式）设置为如下图所示。我想要的是使表单的背景透明，以便只显示圆形图像。我尝试将表单BackColor更改为Transparent但我收到错误Property value is not vald

Answer 1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

         Me.TransparencyKey = Color.LightBlue
         Me.BackColor = Color.LightBlue

    End Sub

Answer 2

如果背景颜色为透明效果，则可以将TransparencyKey属性设置为表单以使白色透明。

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Me.TransparencyKey = Color.White 'if this doesn't work you try:
   'Me.TransparencyKey = Me.BackColor
End Sub

Answer 3

试试这个

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Me.BackColor = Color.Transparent
End Sub

（或）

在构造函数中调用表单的SetStyle方法。

SetStyle(ControlStyles.SupportsTransparentBackColor, True)

Answer 4

   Public Class Form1
Private _InitialStyle As Integer
<Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential)> Public Structure MARGINS
    Public LeftWidth As Integer
    Public RightWidth As Integer
    Public TopHeight As Integer
    Public Buttomheight As Integer
End Structure

<Runtime.InteropServices.DllImport("dwmapi.dll")>
Public Shared Function DwmExtendFrameIntoClientArea(ByVal hWnd As IntPtr, ByRef pMarinset As MARGINS) As Integer
End Function
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
   'TODO: This line of code loads data into the 'DataSet1.MainMenuMaster' table. 'You can move, or remove it, as needed.
   Try
        Me.BackColor = Color.DarkBlue
        Dim margins As MARGINS = New MARGINS
        margins.LeftWidth = -1
        margins.RightWidth = -1
        margins.TopHeight = -1
        margins.Buttomheight = -1
        Dim result As Integer = DwmExtendFrameIntoClientArea(Me.Handle, margins)
    Catch ex As Exception
        Application.Exit()
    End Try
End Sub

End Class

Answer 5

Label1.BackgroundColor = color.FromArgb(25, color.blue)

Answer 6

你可以试试， 从设计方面设置表格的属性

back color = system＆gt; active-caption 并设置透明度＆gt; active-caption

并将以下代码写入表单构造函数或激活事件：

#HoverMe

您还可以观看以下视频：https://www.youtube.com/watch?v=CEuxm-FV-cU