Question

我需要在WinForms按钮中添加两行作为文本，因此我找到了this解决方案。我需要第一行，上面的，用黑色打印，第二行，在第一行，用红色打印。我的问题是背景矩形不透明。我需要背景矩形透明，所以我做了一些改进但没有成功。另外第一行打印在顶部而不是中心（垂直），两行之间的距离（行间距）有太多的分离。我想减少它，并在按钮内的两条线垂直居中。代码下方。

    private void TextButton(Button btn, string line1, string line2)
    {
        btn.Text = String.Empty;
        Bitmap bmp = new Bitmap(btn.ClientRectangle.Width, btn.ClientRectangle.Height);

        using (Graphics G = Graphics.FromImage(bmp))
        {
            G.Clear(btn.BackColor);             

            StringFormat SF = new StringFormat();               
            SF.Alignment = StringAlignment.Center;
            SF.LineAlignment = StringAlignment.Near;
            using (Font tahoma = new Font("Tahoma", 15.75F, System.Drawing.FontStyle.Bold))
            {
                Rectangle RC = btn.ClientRectangle;                 
                RC.Inflate(-5, -5);
                G.FillRectangle(Brushes.Transparent,RC.X,RC.Y,RC.Width,RC.Height);
                G.DrawString(line1, tahoma, Brushes.Black, RC, SF);                 
            }

            using (Font tahoma2 = new Font("Tahoma", 12))
            {                   
                SF.LineAlignment = StringAlignment.Center;
                G.FillRectangle(Brushes.Transparent,btn.ClientRectangle.X,btn.ClientRectangle.Y,btn.ClientRectangle.Width,btn.ClientRectangle.Height);
                G.DrawString(line2, tahoma2, Brushes.Red, btn.ClientRectangle, SF);
            }
        }

        btn.Image = bmp;
        btn.ImageAlign = ContentAlignment.MiddleCenter;
    }

Answer 1

最后我已经解决了。在我的解决方案之下。

private void TextButton(Button btn, string line1, string line2)
{
    btn.Text = String.Empty;
    Bitmap bmp = new Bitmap(btn.ClientRectangle.Width, btn.ClientRectangle.Height);

    using (Graphics G = Graphics.FromImage(bmp))
    {
        G.Clear(Color.Transparent);          <----- I have set this
        G.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit; <--- This to avoid bad text within bitmap
        G.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;     <--- Also this to avoid bad text within bitmap

        StringFormat SF = new StringFormat();               
        SF.Alignment = StringAlignment.Center;
        SF.LineAlignment = StringAlignment.Near;
        using (Font tahoma = new Font("Tahoma", 15.75F, System.Drawing.FontStyle.Bold))
        {
            Rectangle RC = new Rectangle(btn.ClientRectangle.X, btn.ClientRectangle.Y + 30, btn.ClientRectangle.Width, btn.ClientRectangle.Height-30);                 
            RC.Inflate(-5, -5);

            G.DrawString(line1, tahoma, Brushes.Black, RC, SF);                 
        }

        using (Font tahoma2 = new Font("Tahoma", 12))
        {   
            Rectangle RC = new Rectangle(btn.ClientRectangle.X, btn.ClientRectangle.Y + 30, btn.ClientRectangle.Width, btn.ClientRectangle.Height-30);
            RC.Inflate(-5, -5);
            SF.LineAlignment = StringAlignment.Center;                
            G.DrawString(line2, tahoma2, Brushes.Red, RC, SF);
        }
    }

    btn.Image = bmp;
    btn.ImageAlign = ContentAlignment.MiddleCenter;
}

WinForms：按钮有两条线，一条在另一条之上

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