.FillRectangle 不绘制任何东西 [英] .FillRectangle not drawing anything

问题描述

我无法弄清楚为什么 .FillRectangle 对我不起作用.

I'm having trouble figuring out why .FillRectangle is not working for me.

此外，由于它没有抛出任何异常，我想不出为什么会这样，所以我需要一些帮助:/

Furthermore, as it's not thorwing any exception, I ran out of ideas why it could be, so I need some help here:/

受影响的部分代码是这样的

The part of the code affected is this

try
{
    using (FileStream fileStream = File.OpenRead(filePath))
    {
        using (StreamReader streamReader = new StreamReader(fileStream, Encoding.UTF8, true, 1024))
        {
            String line;
            int mW = Convert.ToInt32(Math.Round(this.Size.Width / 2d));
            int mH = Convert.ToInt32(Math.Round(this.Size.Height / 2d));
            SolidBrush myBrush;
            myBrush = new SolidBrush(Color.Black);
            PointF A = new PointF(0f, 0f);
            Graphics g = this.CreateGraphics();
            g.TranslateTransform(mW, mH);
            while ((line = streamReader.ReadLine()) != null)
            {
                string[] points = line.Split(',');
                A = new PointF((float)(Convert.ToDecimal(points[0])), ((float)(Convert.ToDecimal(points[1]))));
                //A is defined correctly, as A.X and A.Y both have values
                g.FillRectangle(myBrush, A.X, A.Y, 1f, 1f);
            }
        }
    }
}
catch (Exception p)
{
    MessageBox.Show(p.Message);
}

任何帮助将不胜感激，因为我对 Grpahics 的了解非常有限

Any help would be supper appreciated, as my knowledge about Grpahics is very limited

提前致谢，

鲁本 :)

推荐答案

好的，这很有帮助:D.谢谢！

Ok, that helped a lot :D. Thanks!

发表评论作为答案然后:

Posting comment as an Answer then:

this.CreateGraphics 可能是罪魁祸首.这将绘制到一个临时表面，当表单刷新时该表面会被擦除.在 Paint() 事件中使用 e.Graphics，或者使用 Graphics.FromImage() 绘制位图并显示它.

this.CreateGraphics is the likely culprit. This draws to a temp surface that gets erased when the Form refreshes. Either use e.Graphics in the Paint() Event, or draw to a Bitmap with Graphics.FromImage() and display that.

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