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        更改文本框的边框颜色

        Change the borderColor of the TextBox(更改文本框的边框颜色)

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                  本文介绍了更改文本框的边框颜色的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  当用户点击或关注文本框时,如何更改文本框的边框颜色?

                  How can I change the BorderColor of the Textbox when a user Clicks on it or focuses on it?

                  推荐答案

                  试试这个

                  bool focus = false;
                  private void Form1_Paint(object sender, PaintEventArgs e)
                  {
                      if (focus)
                      {
                          textBox1.BorderStyle = BorderStyle.None;
                          Pen p = new Pen(Color.Red);
                          Graphics g = e.Graphics;
                          int variance = 3;
                          g.DrawRectangle(p, new Rectangle(textBox1.Location.X - variance, textBox1.Location.Y - variance, textBox1.Width + variance, textBox1.Height +variance ));
                      }
                      else
                      {
                          textBox1.BorderStyle = BorderStyle.FixedSingle;
                      }
                  }
                  
                  private void textBox1_Enter(object sender, EventArgs e)
                  {
                      focus = true;
                      this.Refresh();
                  }
                  
                  private void textBox1_Leave(object sender, EventArgs e)
                  {
                      focus = false;
                      this.Refresh();
                  }
                  

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