Question

我遇到了真正的问题，直到现在我还是无法解决。我正在使用Visual Studio C＃Windows窗体应用程序。我只想复制名称为20190401、20190402和20190403的“源”文件夹中的“ 2019”文件夹。在“源”文件夹中有随机文件夹，例如“ 2018”，“ 2017”等。我想要的结果是单击按钮后，它将自动仅将“源”文件夹中的“ 2019”文件夹复制到“目标”文件夹，然后仅复制2019文件夹中的3个文本文件。

namespace WindowsFormsApplication2
{

    public partial class Form1 : Form

    {
        string FROM_DIR = "C:/Users/5004117928/Desktop/Source";
        string TO_DIR = "C:/Users/5004117928/Desktop/Target/";
        string filename = "t";

        public Form1()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, EventArgs e)
        {  
            DirectoryInfo diCopyForm = new DirectoryInfo(FROM_DIR);
            FileInfo[] fiDiskfiles = diCopyForm.GetFiles();

             foreach (FileInfo newfile in fiDiskfiles.Take(3))
             {
                 try
                 {
                     if (newfile.Name.StartsWith(filename))
                     {
                         File.Copy(newfile.FullName, TO_DIR + newfile.Name);
                     }
                 }
                 catch (Exception ex)
                 {
                     MessageBox.Show(ex.Message);
                 }
             }
        }
    }
}

我希望在单击按钮后输出，所有2019个文件夹都将复制到 “目标”文件夹，其中每个复制的2019文件夹中都有3个文本文件。

Answer 1

让我们逐步执行例程：

  using System.IO;
  using System.Linq;

  ... 

  // "I just want to copy "2019" folders in " Source" 
  string FROM_DIR = "C:/Users/5004117928/Desktop/Source";

  // "with given name 20190401, 20190402, and 20190403"
  HashSet<string> acceptedFiles = new HashSet<string>(StringComparer.OrdinalIgnoreCase) {
    "20190401", "20190402", "20190403"
  };

  // "I want is after I click a button then it automatically only "2019" folders"
  // Here we enumerate all files to copy:
  //   - they are from FROM_DIR, 2019 subfolder
  //   - they are in acceptedFiles ("20190401", "20190402", "20190403")
  var files = Directory
    .EnumerateFiles(Path.Combine(FROM_DIR, "2019"), "*", SearchOption.TopDirectoryOnly)
    .Where(file => acceptedFiles.Contains(Path.GetFileNameWithoutExtension(file)))
    .ToArray();

  // will copy to "target" folder 
  string TO_DIR = "C:/Users/5004117928/Desktop/Target";

  // Copy:
  foreach (var sourceFile in files) {
    // for given sourceFile we change its folder
    string targetFile = Path.Combine(TO_DIR, Path.GetFileName(sourceFile));

    File.Copy(sourceFile, targetFile);
  }

编辑：如果您有很多目录可供选择，让我们列举一下tham并添加Where：

  var files = Directory
    .EnumerateDirectories(FROM_DIR, "*", SearchOption.TopDirectoryOnly)
    .Where(dir => new DirectoryInfo(dir).Name.StartsWith("2019"))
    .SelectMany(dir => Directory
       .EnumerateFiles(dir, "*")
       .Where(file => acceptedFiles.Contains(Path.GetFileNameWithoutExtension(file))))
    .ToArray();

  ...

如何将特定文件夹复制到另一个文件夹？

1 个答案: