C#绘制磁盘容量扇形图

C#获取磁盘的容量并绘制出对应的扇形图

原理很简单：

　　1.获取磁盘驱动器

　　2.判断驱动器类型、以及驱动器是否就绪

　　3.获得磁盘的容量、并根据容量算出扇形的角度

　　4.开始画图

效果图

代码

using System;
using System.Drawing;
using System.IO;
using System.Management;
using System.Windows.Forms;

namespace 磁盘容量扇形图
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }

        private void FrmMain_Load(object sender, EventArgs e)
        {
            //使用WQL查询获取本地磁盘驱动器
            SelectQuery selectQuery = new SelectQuery("select * from win32_LogicalDisk");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(selectQuery);
            foreach (ManagementObject obj in searcher.Get())
            {
                cboDisk.Items.Add(obj["Name"].ToString());
            }
            cboDisk.SelectedIndex = 0;

            //使用 DriveInfo 类获取本地磁盘驱动器
            //foreach (DriveInfo drive in DriveInfo.GetDrives()) 
            //{
            //    cboDisk.Items.Add(drive.Name);
            //}
            //cboDisk.SelectedIndex = 0;

            //使用 Environment 类获取本地磁盘驱动器
            //foreach (string drive in Environment.GetLogicalDrives())
            //{
            //    cboDisk.Items.Add(drive);
            //}
            //cboDisk.SelectedIndex = 0;
        }

        //按钮的点击事件
        private void btnOk_Click(object sender, EventArgs e)
        {
            DriveInfo info = new DriveInfo(cboDisk.Text);
            Graphics g = this.CreateGraphics();
            g.Clear(Color.White);
            //判断磁盘驱动器的类型是否未知
            if (info.DriveType == DriveType.Unknown)
            {
                lblMessage.Text = info.DriveType.ToString();
            }
            else
            {
                //如果驱动器已经就绪、则准备进行图形绘制
                if (info.IsReady)
                {
                    float maxSize = info.TotalSize / (1024 * 1024); //获取磁盘总容量、单位M
                    float freeSize = info.TotalFreeSpace / (1024 * 1024); //获取磁盘剩余容量、单位M
                    float usedAngle = Convert.ToSingle(360 * freeSize / maxSize); //已用磁盘容量的角度数
                    float freeAngle = Convert.ToSingle(360 * (maxSize - freeSize) / maxSize); //剩余磁盘容量的角度数
                    //准备两把不同颜色的刷子
                    Brush freeBrush = new SolidBrush(Color.Lime);//剩余磁盘容量用的刷子
                    Brush usedBrush = new SolidBrush(Color.Blue);//已用磁盘容量用的刷子
                    g.FillPie(freeBrush, 205, 9, 290, 290, 0, freeAngle);
                    g.FillPie(usedBrush, 205, 9, 290, 290, freeAngle, usedAngle);
                    //释放资源
                    freeBrush.Dispose();
                    usedBrush.Dispose();
                    g.Dispose();
                    //在标签上显示磁盘的相关信息
                    lblMessage.Text = "驱动器盘符：" + cboDisk.Text
                        + "\n\n\n驱动器卷标：" + info.VolumeLabel
                        + "\n\n\n文件系统：" + info.DriveFormat
                        + "\n\n\n磁盘总容量：" + (maxSize)
                        + "M\n\n\n磁盘使用量：" + (maxSize - freeSize)
                        + "M\n\n\n磁盘剩余量：" + freeSize + "M";
                }
                else
                {
                    lblMessage.Text = "驱动器盘符：" + cboDisk.Text
                        + "\n\n\n驱动器类型：" + info.DriveType + "\n\n\n该驱动器未就绪";
                }
            }
        }
    }
}