Question

如何用c#代码实码单击文本框后改变该文本框的颜色，其它的不变

如何用c#代码实码单击文本框后改变该文本框的颜色，其它的不变

Answer 1

重写TextBox
/// <summary>
/// 进入
/// </summary>
/// <param name="e"></param>
protected override void OnEnter(EventArgs e)
{
base.OnEnter(e);

{
this.BackColor = Color.FromArgb(255, 255, 225);
this.ForeColor = Color.Black;
}
}
/// <summary>
/// 离开事件
/// </summary>
/// <param name="e"></param>
protected override void OnLeave(EventArgs e)
{
base.OnLeave(e);

{
this.ForeColor = Color.Black;
this.BackColor = SystemColors.Window;
}
}

Answer 2

private void textBox1_Click(object sender, EventArgs e)
{
Random rd = new Random();
int i = rd.Next(0, 255);
int j = rd.Next(0, 255);
int k = rd.Next(0, 255);
this.textBox1.BackColor = Color.FromArgb(i, j, k);
}

Answer 3

private void Form10_Paint(object sender, PaintEventArgs e)
{
Rectangle rc = textBox1.Bounds;
rc.X -= 1; rc.Y -= 1;
rc.Inflate(1, 1);
e.Graphics.DrawRectangle(Pens.Red, rc);
}