C#如何实现彩色进度条
1、创建一个WinForm程序，名称随便。
2、新建一个类叫"ColorsProgressBar"，代码如下：
using System;
using System.Collections.Generic;
using System.Drawing;
namespace System.Windows.Forms
{
public class ColorsProgressBar : ProgressBar
{
private List<Color> colors;
public ColorsProgressBar() : base()
{
base.SetStyle(ControlStyles.UserPaint, true);
this.Minimum = 0;
colors = new List<Color>();
Random r = new Random();
for (int i = 0; i < this.Maximum - this.Minimum; i++)
{
this.Colors.Add(Color.FromArgb(r.Next(0, 256), r.Next(0, 256), r.Next(0, 256)));
}
}
public List<Color> Colors
{
get { return colors; }
set
{
if (value.Count != this.Maximum - this.Minimum || value.Count == 0)
{
throw new ArgumentException("System.Windows.Forms.ColorProgressBar.Colors.Count不等于System.Windows.Forms.ColorProgressBar.Maximum-System.Windows.Forms.ColorProgressBar.Minimum或者等于0");
}
colors = value;
}
}
protected override void OnPaint(PaintEventArgs e)
{
SolidBrush brush = null;
Pen pen = null;
Rectangle bounds = new Rectangle(0, 0, base.Width, base.Height);
e.Graphics.FillRectangle(new SolidBrush(this.BackColor), 1, 1, bounds.Width - 2, bounds.Height - 2);
bounds.Height -= 4;
bounds.Width = ((int)(bounds.Width * (((double)base.Value) / ((double)base.Maximum)))) - 4;
for (int i = 0; i < this.Value; i++)
{
e.Graphics.FillRectangle(new SolidBrush(this.Colors[i]), new Rectangle((this.Width / (this.Maximum - this.Minimum)) * i, 0, this.Width / (this.Maximum - this.Minimum), this.Height));
}
}
}
}
3、生成一下，再到Windows窗体拖入ColorsProgressBar和一个Button，Button上显示"启动"。
4、给显示"启动"的Button注册点击事件，代码如下图所示：
5、启动应用程序，点击"启动"就可以看到进度条的颜色一直在变化啦~~~
