更改TextBox C#中的边框颜色

Change border color in TextBox C#(更改TextBox C#中的边框颜色)

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);
   }
}

这很完美，但在获得焦点之前它不会显示文本.

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

你也要手动绘制文本.

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);
}

如果 TextRenderer 没有给你想要的结果，你也可以尝试使用 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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