C＃組合框顏色

Question

可能重複：
Colour Individual Items in a winforms ComboBox?

是任何簡單的例子來設置每個項目的定義背景顏色？

Answer 1

可以通過調用組合框的DRAWITEM實現你的目標，更多信息參見下面的方法。

private void comboBox1_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e) 
    { 
     // Override this function to draw items in the Color comboBox 

     // Get the Graphics Object (aka. CDC or Device Context Object) 
     // passed via the DrawItemEventArgs parameter 
     Graphics g = e.Graphics ; 

     // Get the bounding rectangle of the item currently being painted 
     Rectangle r = e.Bounds ; 

     if (e.Index >= 0) 
     { 
      Rectangle rd = r; 
      r.X = r.Right ; 

      // Get the brush object, at the specifid index in the colorArray 
      SolidBrush b = (SolidBrush)colorArray[e.Index]; 
      // Fill a portion of the rectangle with the selected brush 
      g.FillRectangle(b, rd); 


      // Draw the rectangle 
      e.Graphics.DrawRectangle(new Pen(new SolidBrush(Color.Black), 2), r); 

      if (e.State == (DrawItemState.NoAccelerator | DrawItemState.NoFocusRect)) 
      { 
       // if the item is not selected draw it with a different color 
       e.Graphics.FillRectangle(new SolidBrush(Color.White) , r); 
       e.DrawFocusRectangle(); 
      } 
      else 
      { 
       // if the item is selected draw it with a different color 
       e.Graphics.FillRectangle(new SolidBrush(Color.LightBlue) , r); 
       e.DrawFocusRectangle(); 
      } 
     } 
    }