C# 获取磁盘空间大小

/**/                          ///   

        /// 获取指定驱动器的空间总大小(单位为B) 

        ///   

        ///  只需输入代表驱动器的字母即可 （大写） 

        ///    

        public static long GetHardDiskSpace(string str_HardDiskName) 

        ...{ 

            long totalSize= new long(); 

            str_HardDiskName=str_HardDiskName +":\\\\"; 

            System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives(); 

            foreach (System.IO.DriveInfo drive in drives) 

            ...{ 

                if (drive.Name == str_HardDiskName) 

                ...{

                    totalSize = drive.TotalSize / (1024 * 1024 * 1024); 

                } 

            } 

            return totalSize; 

        }

 

        /**////   

        /// 获取指定驱动器的剩余空间总大小(单位为B) 

        ///   

        ///  只需输入代表驱动器的字母即可  

        ///    

        public static long GetHardDiskFreeSpace(string str_HardDiskName) 

        ...{ 

            long freeSpace = new long(); 

            str_HardDiskName = str_HardDiskName + ":\\\\"; 

            System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives(); 

            foreach (System.IO.DriveInfo drive in drives) 

            ...{ 

                if (drive.Name == str_HardDiskName) 

                ...{

                    freeSpace = drive.TotalFreeSpace / (1024 * 1024 * 1024); 

                } 

            } 

            return freeSpace; 

        }

		

    /**//// 
    /// 盘符信息
    /// 
    public class HardDiskPartition
    ...{
        Data#region Data
        private string _PartitionName;
        private double _FreeSpace;
        private double _SumSpace;
        #endregion //Data
 
        Properties#region Properties
        /**//// 
        /// 空余大小
        /// 
        public double FreeSpace
        ...{
            get ...{ return _FreeSpace; }
            set ...{ this._FreeSpace = value; }
        }
        /**//// 
        /// 使用空间
        /// 
        public double UseSpace
        ...{
            get ...{ return _SumSpace - _FreeSpace; }
        }
        /**//// 
        /// 总空间
        /// 
        public double SumSpace
        ...{
            get ...{ return _SumSpace; }
            set ...{ this._SumSpace = value; }
        }
        /**//// 
        /// 分区名称
        /// 
        public string PartitionName
        ...{
            get ...{ return _PartitionName; }
            set ...{ this._PartitionName = value; }
        }
        /**//// 
        /// 是否主分区
        /// 
        public bool IsPrimary
        ...{
            get
            ...{
                //判断是否为系统安装分区
                if (System.Environment.GetEnvironmentVariable("windir").Remove(2) == this._PartitionName)
                ...{
                    return true;
                }
                else
                ...{
                    return false;
                }
            }
        }
        #endregion //Properties
    }

		

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Management;
using System.IO;
namespace ExPortToExcel
...{
    public partial class Form1 : Form
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