布尔检查是否有任何驱动器包含特定的驱动器类型

Question

如何编写一个类似这样的检查...如果任何(或至少一个)驱动器类型是CDRom,那么真/继续......否则为假(抛出错误)？

现在,我为每个不通过CDRom要求的驱动器检查抛出了错误.我想我需要使用Any()的LINQ查询,但我不断收到错误.我可能没有正确地写它.

我的计划是在以下情况下抛出错误消息:

- 没有输入CD

- 计算机上没有CD-ROM驱动器

-CD输入为空白

-CD输入不包含所需的特定文件

到目前为止,这是我所希望的方式:

DriveInfo[] allDrives = DriveInfo.GetDrives();

            foreach (DriveInfo d in allDrives)
            {
                Console.WriteLine("Drive {0}", d.Name);
                Console.WriteLine("  File type: {0}", d.DriveType);

                if (d.IsReady == true && d.DriveType == DriveType.CDRom)
                {
                    DirectoryInfo di = new DirectoryInfo(d.RootDirectory.Name);

                    var file = di.GetFiles("*.csv", SearchOption.AllDirectories).FirstOrDefault();

                    if (file == null)
                    {

                        errorwindow.Message = LanguageResources.Resource.File_Not_Found;
                        dialogService.ShowDialog(LanguageResources.Resource.Error, errorWindow);
                    }
                    else
                    {
                        foreach (FileInfo info in di.GetFiles("*.csv", SearchOption.AllDirectories))
                        {
                            Debug.Print(info.FullName);
                            ImportCSV(info.FullName);
                            break;      // only looking for the first one
                        }
                    }
                }
                else
                {
                    errorwindow.Message = LanguageResources.Resource.CDRom_Error;
                    dialogService.ShowDialog(LanguageResources.Resource.Error, errorWindow);
                }
            }

目前的问题是设置循环以首先单独设置每个驱动器.在一次驱动器检查不是CD-Rom之后,它会抛出一条错误消息并为每个驱动器执行此操作.我只想要一个统一的错误消息.

Answer 1

如何编写一个类似这样的检查...如果任何(或至少一个)驱动器类型是CDRom,那么真/继续......否则为假(抛出错误)？

你可以尝试这样的事情:

// Get all the drives.
DriveInfo[] allDrives = DriveInfo.GetDrives();

// Check if any cdRom exists in the drives.
var cdRomExists = allDrives.Any(drive=>drive.DriveType==DriveType.CDRom);

// If at least one cd rom exists. 
if(cdRomExists)
{
    // Get all the cd roms.
    var cdRoms = allDrives.Where(drive=>drive.DriveType==DriveType.CDRom);

    // Loop through the cd roms collection.
    foreach(var cdRom in cdRoms)
    {
        // Check if a cd is in the cdRom.
        if(cdRom.IsReady)
        {

        }
        else // the cdRom is empty.
        {

        }
    }
}
else // There isn't any cd rom.
{

}