將背景顏色設置爲色調顏色

Question

如何設置附加圖像中指定的窗體的背景顏色？

Answer 1

一種方法是直接用圖像作爲形式的BackgroundImage。

如果你想要實現這個proceduarally（更靈活），可以使用手動OnPaintBackground繪製表格的背景：

protected override void OnPaintBackground(PaintEventArgs e) 
{ 
    using (var brush = new LinearGradientBrush 
       (DisplayRectangle, Color.Black, Color.DarkGray, LinearGradientMode.Vertical)) 
    { 
     e.Graphics.FillRectangle(brush, DisplayRectangle); 
    } 
} 

protected override void OnResize(EventArgs e) 
{ 
    base.OnResize(e); 
    Invalidate(); // Force repainting on resize 
} 

結果：

Answer 2

使用可以使用OnPaint event的winform，在那裏你可以做一些修改。檢查指定的鏈接以瞭解詳細信息。

使用LinearGradientBrush要做到這一點是：

/*取一個線性漸變畫筆*/

LinearGradientBrush brush = new LinearGradientBrush(rect, Color.Orange, Color.Orchid, LinearGradientMode.ForwardDiagonal); 

的OnPaint的

代碼段過載：

Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) 

     ' Declare a variable of type Graphics named formGraphics. 

     ' Assign the address (reference) of this forms Graphics object 

     ' to the formGraphics variable. 

     Dim formGraphics As Graphics = e.Graphics 

     ' Declare a variable of type LinearGradientBrush named gradientBrush. 

     ' Use a LinearGradientBrush constructor to create a new LinearGradientBrush object. 

     ' Assign the address (reference) of the new object 

     ' to the gradientBrush variable. 

     Dim gradientBrush As New LinearGradientBrush(New Point(0, 0), New Point(Width, 0), Color.White, Color.DarkMagenta) 



     ' Here are two more examples that create different gradients. 

     ' Comment the Dim statement immediately above and uncomment one of these 

     ' Dim statements to see how varying the two colors changes the gradient result. 

     ' Dim gradientBrush As New LinearGradientBrush(New Point(0, 0), New Point(Width, 0), Color.Chartreuse, Color.SteelBlue) 

     ' Dim gradientBrush As New LinearGradientBrush(New Point(0, 0), New Point(Width, 0), Color.White, Color.SteelBlue) 



     formGraphics.FillRectangle(gradientBrush, ClientRectangle) 

    End Sub 

另一種方法是使用OnPaintBackground事件和使用LinearGradientBrush ref：MSDN

protected override void OnPaintBackground(PaintEventArgs e) { 
     Rectangle rc = new Rectangle(0, 0, this.ClientSize.Width, this.ClientSize.Height); 
     using (LinearGradientBrush brush = new LinearGradientBrush(rc, Color.Red, Color.Blue, 45F)) { 
     e.Graphics.FillRectangle(brush, rc); 
     } 

參考：
How to Add a Gradient Background to a Win Form with VB.NET & VB2005
Windows Forms 2.0-Draw Beautiful Gradient Backdrops
Set Gradient/Shaded Background to Windows form using c#

檢查Resize相關的信息在這裏： this.Invalidate() -
Create a Gradient background on your Forms or Controls

檢查該SO也是線程.. Transparent control backgrounds on a VB.NET gradient filled form?