c# – FillRectangle参数无效

这是我得到的例外

System.ArgumentException was unhandled
  HResult=-2147024809
  Message=Parameter is not valid.
  Source=System.Drawing
  StackTrace:
       at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
       at System.Drawing.Graphics.FillRectangle(Brush brush,Int32 x,Int32 y,Int32 width,Int32 height)
       at System.Drawing.Graphics.FillRectangle(Brush brush,Rectangle rect)
       at frmMain.drawCBoxItem(Object sender,DrawItemEventArgs e) in frmMain.cs:line 465
       at frmMain.cBoxSectionCell_DrawItem(Object sender,DrawItemEventArgs e) in frmMain.cs:line 485
       at System.Windows.Forms.ComboBox.OnDrawItem(DrawItemEventArgs e)
       at System.Windows.Forms.ComboBox.WmReflectDrawItem(Message& m)
       at System.Windows.Forms.ComboBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,Int32 msg,IntPtr wparam,IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,IntPtr wParam,IntPtr lParam)
       at System.Windows.Forms.Control.SendMessage(Int32 msg,IntPtr lparam)
       at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd,Message& m)
       at System.Windows.Forms.Control.WmOwnerDraw(Message& m)
       at System.Windows.Forms.Control.WmDrawItem(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at System.Windows.Forms.ContainerControl.WndProc(Message& m)
       at System.Windows.Forms.Form.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc,IntPtr hWnd,IntPtr lParam)
       at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
       at System.Windows.Forms.Control.DefWndProc(Message& m)
       at System.Windows.Forms.Control.WmOwnerDraw(Message& m)
       at System.Windows.Forms.Control.WmDrawItem(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ComboBox.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,IntPtr lparam)
  InnerException:

和代码

if (e.Index > -1)
{
    e.DrawBackground();

    Brush bgColourBrush = null;
    Brush fgColourBrush = null;
    ComboBox combo = (ComboBox)sender;
    objPDT.ListCell pdt = (objPDT.ListCell)combo.Items[e.Index];

    if (e.ForeColor == SystemColors.HighlightText)
    {
        bgColourBrush = new SolidBrush(e.BackColor);
        fgColourBrush = new SolidBrush(e.ForeColor);
    }
    else if (pdt.bgColour == null)
    {
        bgColourBrush = Brushes.Black;
        fgColourBrush = Brushes.White;
    }
    else
    {
        bgColourBrush = pdt.bgColour;
        fgColourBrush = pdt.fgColour;
    }


        // background
        e.Graphics.FillRectangle(bgColourBrush,e.Bounds);
        //foreground
        e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
        e.Graphics.DrawString(pdt.Name,combo.Font,fgColourBrush,e.Bounds.X,e.Bounds.Y);

}

最后传递给它的值：

pdt {
    Section 8--> CELL}  objPDT.ListCell
    _bgcolour   {Color = {Color [A=255,R=166,G=166,B=166]}}  System.Drawing.Brush {System.Drawing.SolidBrush}
    _CellID 27  int
    _fgcolour   {Color = {Color [A=255,R=255,G=255,B=255]}}  System.Drawing.Brush {System.Drawing.SolidBrush}
    _name   "Section 8--> CELL" string
    _SectionID  8   int
    bgColour    {Color = {Color [A=255,B=166]}}  System.Drawing.Brush {System.Drawing.SolidBrush}
    fgColour    {Color = {Color [A=255,B=255]}}  System.Drawing.Brush {System.Drawing.SolidBrush}
    Name    "Section 8--> CELL" string
    Value   "8:27"  string
}

e.Bounds    {X = 0 Y = 30 Width = 290 Height = 15}  System.Drawing.Rectangle
    Bottom  45  int
    Height  15  int
    IsEmpty false   bool
    Left    0   int
    Location    {X = 0 Y = 30}  System.Drawing.Point
    Right   290 int
    Size    {Width = 290 Height = 15}   System.Drawing.Size
    Top 30  int
    Width   290 int
    X   0   int
    Y   30  int

解决方法

您可以创建bgColourBrush和fgColourBrush全局变量,而不是使用每个绘制创建Brush对象,而只需改变它们的颜色.如果下面的代码没有按原样编译,请原谅我,我这是徒手写的. @H_301_16@像这样：

if (e.Index > -1)
{
    e.DrawBackground();

    ComboBox combo = (ComboBox)sender;
    objPDT.ListCell pdt = (objPDT.ListCell)combo.Items[e.Index];

    if (e.ForeColor == SystemColors.HighlightText)
    {
        this.bgColourBrush.Color = e.BackColor;
        this.fgColourBrush.Color = e.ForeColor;
    }
    else if (pdt.bgColour == null)
    {
        this.bgColourBrush.Color = Brushes.Black.Color;
        this.fgColourBrush.Color = Brushes.White.Color;
    }
    else
    {
        this.bgColourBrush.Color = pdt.bgColour;
        this.fgColourBrush.Color = pdt.fgColour;
    }


    // background
    e.Graphics.FillRectangle(bgColourBrush,e.Bounds);
    //foreground
    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
    e.Graphics.DrawString(pdt.Name,e.Bounds.Y);
}

UPDATE

所以我看到你的pdt ListCell对象有一个bgColour和一个fgColour属性.为了使我的上述解决方案起作用,bgColour和fgColour需要是Color类型.或者如果它们是SolidColorBrush类型,那么你需要这样做：bgColour.Color和fgColour.Color.

c# – FillRectangle参数无效

解决方法

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