在 TextBox C# 中更改边框颜色 [英] Change border color in TextBox C#

问题描述

我有以下代码:

public class OurTextBox : TextBox
{
    public OurTextBox()
        : base()
    {
        this.SetStyle(ControlStyles.UserPaint, true);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
         base.OnPaint(e);
         Pen penBorder = new Pen(Color.Gray, 1);
         Rectangle rectBorder = new Rectangle(e.ClipRectangle.X, e.ClipRectangle.Y, e.ClipRectangle.Width - 1, e.ClipRectangle.Height - 1);
         e.Graphics.DrawRectangle(penBorder, rectBorder);
   }
}

这是完美的，但直到它获得焦点才显示文本.

This is working perfect, but it doesn't show the text until it gets focus.

有人可以帮我吗?怎么了?

Can anybody help me? What is wrong?

提前致谢.

推荐答案

您也必须手动绘制文本.

You have to draw text manually as well.

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    Pen penBorder = new Pen(Color.Gray, 1);
    Rectangle rectBorder = new Rectangle(e.ClipRectangle.X, e.ClipRectangle.Y, e.ClipRectangle.Width - 1, e.ClipRectangle.Height - 1);
    e.Graphics.DrawRectangle(penBorder, rectBorder);

    Rectangle textRec = new Rectangle(e.ClipRectangle.X + 1, e.ClipRectangle.Y + 1, e.ClipRectangle.Width - 1, e.ClipRectangle.Height - 1);
    TextRenderer.DrawText(e.Graphics, Text, this.Font, textRec, this.ForeColor, this.BackColor, TextFormatFlags.Default);
}

或者，如果 TextRenderer 没有给你想要的结果，你可以尝试使用 e.Graphics.DrawString() 方法(我总是用这种方法得到更好的结果).

Alternatively you can try to use e.Graphics.DrawString() method if TextRenderer is not giving you desired results (I always have better results with this approach thou).

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