更改文本框的边框颜色

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(); }