在C#中的foreach中獲得的數字相加-有解無憂

使用以下代碼，我將分別接收所有 Windows 硬碟的卷

        foreach (var drive in DriveInfo.GetDrives())
        {
            int bb = Convert.ToInt32(drive.TotalSize / 1024 / 1024 / 1024);
        }

這就是回報

100GB 500GB 2300GB

但我想收集號碼并交出但這就是我想要的 100GB 500GB 2300GB

2900GB

uj5u.com熱心網友回復：

您可以在https://dotnetfiddle.net/27YcIp上測驗/運行此代碼

using System.Linq;
using System.IO;
using System;


Console.WriteLine(Drives.GetAllDriveSizeA());
Console.WriteLine(Drives.GetAllDriveSizeB());
Console.WriteLine(Drives.GetAllDriveSizeC());
Console.WriteLine(Drives.GetAllDriveSizeD());
Console.ReadLine();

public static class Drives
{
    public static long GetAllDriveSizeA() // With Linq
    {
        return DriveInfo.GetDrives().Where(d => d.IsReady).Sum(d => d.TotalSize / 1024 / 1024 / 1024);
    }

    public static long GetAllDriveSizeB()
    {
        long total = 0;
        foreach (DriveInfo drive in DriveInfo.GetDrives()) //With foreach loop
        {
            if (drive.IsReady)
            {
                total  = drive.TotalSize / 1024 / 1024 / 1024;
            }
        }
        return total;
    }

    public static long GetAllDriveSizeC()//With for loop
    {
        long total = 0;
        DriveInfo[] drives = DriveInfo.GetDrives();
        for (int i = 0; i < drives.Length; i  )
        {
            if (drives[i].IsReady)
            {
                total  = drives[i].TotalSize / 1024 / 1024 / 1024;
            }
        }
        return total;
    }

    public static long GetAllDriveSizeD() //With List<T>.Foreach 
    {
        long total = 0;
        DriveInfo.GetDrives().ToList().ForEach(drive =>
        {
            if (drive.IsReady)
            {
                total  = drive.TotalSize / 1024 / 1024 / 1024;
            }
        });
        return total;
    }
}


//DriveInfo.GetDrives() - Get Drive list.
//Where(d => d.IsReady) - filters only drives(elements) that are ready otherwise will get exception when trying to get total size.
//Sum(d => d.TotalSize / 1024 / 1024 / 1024) - Sum each element / 1024 / 1024 / 1024

//d => ....  Is lambda expression (anonymous function). d is the parameter of the function and .... is the value returned by this function.

輸出我的電腦

參考
Lambda 運算式
Linq - Where
Linq - Sum
List.Foreach

uj5u.com熱心網友回復：

這樣您就可以獲得所有磁盤的位元組容量：

    int byteTotalCapacity = 0;
    foreach (var drive in DriveInfo.GetDrives())
    {
        byteTotalCapacity  = drive.TotalSize;
    }

如果你想要它在 GB 你必須除以 (1024*1024)

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標籤：C＃。网硬盘

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