C# - SQL - LINQ 查询

Question

这个查询有一些问题::

var q2 =
    from sd in db.ServerDrives
    where sd.DriveLetter == driveList[i].Name
    select sd;
ServerDrive existingServerDrives = q.First();
existingServerDrives.FreeSpace = driveList[i].FreeSpace;
//..
db.SubmitChanges();

我的问题是我不知道将 [i] 的引用放在哪里。

引用 [i]::

for (int i = 0; i < driveList.Count; i++)

我可以把它放在上面，

existingServerDrives.FreeSpace = driveList[i].FreeSpace;

并且该行可以识别它，但由于 .(下面的代码)，我需要整个查询来识别它。行

where sd.DriveLetter == driveList[i].Name;

有谁知道我怎么可能做到这一点？

编辑: 完整代码::

class Program
{
    List<DriveInfo> driveList = DriveInfo.GetDrives().Where(x => x.IsReady).ToList<DriveInfo>(); //Get all the drive info
    Server server = new Server();  //Create  the server object
    ServerDrive serverDrives = new ServerDrive();

    public static void Main()
    {
        Program c = new Program();
        c.RealDriveInfo();
        c.WriteInToDB();
    }

    public void RealDriveInfo()
    {


        //Insert information of one server - You will need get information of all servers
        server.ServerID = 0; //Here is necessery put PK key. I recommend doing the SQL server will automatically generate the PK.
        server.ServerName = string.Concat(System.Environment.MachineName);

        //Inserts information in the newServers object
        for (int i = 0; i < driveList.Count; i++)
        {

            //Put here all the information to object Server                
            serverDrives.DriveLetter = driveList[i].Name;
            serverDrives.TotalSpace = driveList[i].TotalSize;
            serverDrives.DriveLabel = driveList[i].VolumeLabel;
            serverDrives.FreeSpace = driveList[i].TotalFreeSpace;
            serverDrives.DriveType = driveList[i].DriveFormat;
            server.ServerDrives.Add(serverDrives);

        }
    }

    public void WriteInToDB()
    {
        //Add the information to an SQL Database using Linq.
        DataClasses1DataContext db = new DataClasses1DataContext(@"sqlserver");
        db.Servers.InsertOnSubmit(server);

        var q2 =
            from s in db.Servers
            where s.ServerName == "LAPTOP-043"
            select s;
        Server existingServers = q2.First();
        for (int i = 0; i < driveList.Count; i++)
            existingServers.ServerName = string.Concat(System.Environment.MachineName);
        //..
        for (int i = 0; i < driveList.Count; i++)
        {
            var q =
                from sd in db.ServerDrives
                where sd.DriveLetter == driveList[i].Name
                select sd;
            ServerDrive existingServerDrives = q.First();
            existingServerDrives.FreeSpace = driveList[i].FreeSpace;
            //..
            db.SubmitChanges();

我想要做的是让查询找到与这台计算机上的驱动器 C:\相同的“DriveLetter”行。第二部分应该更改 FreeSpace 值并将其替换为从控制台应用程序检索到的新 FreeSpace 值。

如有任何反馈，我们将不胜感激，提前致谢:)

Answer 1

不确定你想说什么或做什么，但是这个怎么样:

for (int i =0; i < driveList.Count; i++)
{
var q2 =
    from sd in db.ServerDrives
    where sd.DriveLetter == driveList[i].Name
    select sd;
ServerDrive existingServerDrives = q2.First();
existingServerDrives.FreeSpace = driveList[i].FreeSpace;
//..
db.SubmitChanges();
}