相关疑难解决方法(0)

是否更好的方法在Paint事件中使用新的Brush,即

protected override void OnPaint(PaintEventArgs e) {
    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
    using (SolidBrush b = new SolidBrush(Color.FromArgb(129, 242, 121))) {
        for (int i = 0; i < 12; i++) {    
            e.Graphics.FillPath(b, path[i]);
        }
    }
    base.OnPaint(e);
}

或者在顶部定义一次并在Dispose方法中处理即

SolidBrush _brush;
protected SolidBrush Brush {
    get {
        if (_brush == null)
            _brush = new SolidBrush(Color.FromArgb(129, 242, 121));
        return _brush;
    }
}

我正在写一个生物节律应用程序.为了测试它,我有一个带有Button和PictureBox的表单.当我点击按钮时,我做了

myPictureBox.Image = GetBiorhythm2();

哪个第一次运行正常,但在第二次单击时会导致以下异常:

System.ArgumentException: Parameter is not valid.
   at System.Drawing.Graphics.CheckErrorStatus
   at System.Drawing.Graphics.FillEllipse
   at Larifari.Biorhythm.Biorhythm.GetBiorhythm2 in c:\delo\Horoskop\Biorhythm.cs:line 157
   at Larifari.test.Button1Click in c:\delo\Horoskop\test.Designer.cs:line 169
   at System.Windows.Forms.Control.OnClick
   at System.Windows.Forms.Button.OnClick
   at System.Windows.Forms.Button.OnMouseUp
   at System.Windows.Forms.Control.WmMouseUp
   at System.Windows.Forms.Control.WndProc
   at System.Windows.Forms.ButtonBase.WndProc
   at System.Windows.Forms.Button.WndProc
   at ControlNativeWindow.OnMessage
   at ControlNativeWindow.WndProc
   at System.Windows.Forms.NativeWindow.DebuggableCallback
   at ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop
   at ThreadContext.RunMessageLoopInner
   at ThreadContext.RunMessageLoop
   at System.Windows.Forms.Application.Run
   at Larifari.test.Main in c:\delo\Horoskop\test.cs:line 20

导致错误的减少功能是:

public static Image GetBiorhythm2() {
        Bitmap bmp = new Bitmap(600, 300);
        Image img = bmp;
        Graphics g = Graphics.FromImage(img);

        Brush …