使用.NET删除目录中3个月以上的文件

我想知道（使用C＃）如何删除3个月以上的某个目录中的文件，但是我认为日期期限可能会很灵活。

明确说明：我正在寻找90天之前的文件，换句话说，应该保留少于90天之前创建的文件，删除所有其他文件。

像这样的事情不能做到。

using System.IO; 

string[] files = Directory.GetFiles(dirName);

foreach (string file in files)
{
   FileInfo fi = new FileInfo(file);
   if (fi.LastAccessTime < DateTime.Now.AddMonths(-3))
      fi.Delete();
}

这是1层Lambda：

Directory.GetFiles(dirName)
         .Select(f => new FileInfo(f))
         .Where(f => f.LastAccessTime < DateTime.Now.AddMonths(-3))
         .ToList()
         .ForEach(f => f.Delete());

对于那些喜欢过度使用LINQ的人。

(from f in new DirectoryInfo("C:/Temp").GetFiles()
 where f.CreationTime < DateTime.Now.Subtract(TimeSpan.FromDays(90))
 select f
).ToList()
    .ForEach(f => f.Delete());

以下是如何获取目录中文件创建时间以及如何查找3个月前（确切地说是90天之前）创建的文件的代码段：

    DirectoryInfo source = new DirectoryInfo(sourceDirectoryPath);

    // Get info of each file into the directory
    foreach (FileInfo fi in source.GetFiles())
    {
        var creationTime = fi.CreationTime;

        if(creationTime < (DateTime.Now- new TimeSpan(90, 0, 0, 0)))
        {
            fi.Delete();
        }
    }

System.IO.File类的GetLastAccessTime属性应该有所帮助。

基本上，您可以使用Directory.Getfiles（Path）来获取所有文件的列表。之后，您将遍历列表并按照Keith的建议调用GetLastAccessTim（）。

像这样

            foreach (FileInfo file in new DirectoryInfo("SomeFolder").GetFiles().Where(p => p.CreationTime < DateTime.Now.AddDays(-90)).ToArray())
                File.Delete(file.FullName);

我已经尝试过此代码，并且效果很好，希望这个答案

namespace EraseJunkFiles
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo yourRootDir = new DirectoryInfo(@"C:\yourdirectory\");
            foreach (FileInfo file in yourRootDir.GetFiles())
                if (file.LastWriteTime < DateTime.Now.AddDays(-90))
                    file.Delete();
        }
    }
}

想要在一定时间内删除文件的最典型方法是使用文件的LastWriteTime（上次修改文件的时间）：

Directory.GetFiles(dirName)
         .Select(f => new FileInfo(f))
         .Where(f => f.LastWriteTime < DateTime.Now.AddMonths(-3))
         .ToList()
         .ForEach(f => f.Delete());

（以上基于Uri的答案，但带有LastWriteTime。）

每当您听到有人谈论删除某个特定时间范围之前的文件（这是很常见的活动）时，几乎总是在根据文件的LastModifiedTime进行操作。

另外，在非常特殊的情况下，您可以使用以下内容，但请注意以下事项，因为它们带有警告。

CreationTime
.Where(f => f.CreationTime < DateTime.Now.AddMonths(-3))

在当前位置创建文件的时间。但是，请注意，如果文件被复制，将是复制的时间，并且该时间将比文件的CreationTime时间新LastWriteTime。

LastAccessTime
.Where(f => f.LastAccessTime < DateTime.Now.AddMonths(-3))

如果要基于上次读取的时间删除文件，可以使用此功能，但是不能保证将其更新，因为可以在NTFS中禁用它。检查fsutil behavior query DisableLastAccess它是否打开。同样在NTFS下，访问文件后，LastAccessTime可能需要一个小时才能更新。

您只需要FileInfo- > CreationTime

而不仅仅是计算时差。

在app.config中，您可以保存必须删除文件多长时间的TimeSpan值

还检查出DateTime减法。

祝好运

另外，如果您需要根据创建日期删除文件，则可以使用File.GetCreationTime方法。

            system.IO;

             List<string> DeletePath = new List<string>();
            DirectoryInfo info = new DirectoryInfo(Server.MapPath("~\\TempVideos"));
            FileInfo[] files = info.GetFiles().OrderBy(p => p.CreationTime).ToArray();
            foreach (FileInfo file in files)
            {
                DateTime CreationTime = file.CreationTime;
                double days = (DateTime.Now - CreationTime).TotalDays;
                if (days > 7)
                {
                    string delFullPath = file.DirectoryName + "\\" + file.Name;
                    DeletePath.Add(delFullPath);
                }
            }
            foreach (var f in DeletePath)
            {
                if (File.Exists(F))
                {
                    File.Delete(F);
                }
            }

用于网页加载或网络服务或其他任何用途。

我的概念是evrry 7天，我必须不使用DB删除文件夹文件

         //Store the number of days after which you want to delete the logs.
         int Days = 30;

          // Storing the path of the directory where the logs are stored.
           String DirPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase).Substring(6) + "\\Log(s)\\";

          //Fetching all the folders.
            String[] objSubDirectory = Directory.GetDirectories(DirPath);

            //For each folder fetching all the files and matching with date given 
            foreach (String subdir in objSubDirectory)     
            {
                //Getting the path of the folder                 
                String strpath = Path.GetFullPath(subdir);
                //Fetching all the files from the folder.
                String[] strFiles = Directory.GetFiles(strpath);
                foreach (string files in strFiles)
                {
                    //For each file checking the creation date with the current date.
                    FileInfo objFile = new FileInfo(files);
                    if (objFile.CreationTime <= DateTime.Now.AddDays(-Days))
                    {
                        //Delete the file.
                        objFile.Delete();
                    }
                }

                //If folder contains no file then delete the folder also.
                if (Directory.GetFiles(strpath).Length == 0)
                {
                    DirectoryInfo objSubDir = new DirectoryInfo(subdir);
                    //Delete the folder.
                    objSubDir.Delete();
                }

            }

例如：要在源代码上进入“我的文件夹”项目，我需要打开两个文件夹。我将这种算法设置为每周2天到4小时内

public static void LimpiarArchivosViejos()
    {
        DayOfWeek today = DateTime.Today.DayOfWeek;
        int hora = DateTime.Now.Hour;
        if(today == DayOfWeek.Monday || today == DayOfWeek.Tuesday && hora < 12 && hora > 8)
        {
            CleanPdfOlds();
            CleanExcelsOlds();
        }

    }
    private static void CleanPdfOlds(){
        string[] files = Directory.GetFiles("../../Users/Maxi/Source/Repos/13-12-2017_config_pdfListados/ApplicaAccWeb/Uploads/Reports");
        foreach (string file in files)
        {
            FileInfo fi = new FileInfo(file);
            if (fi.CreationTime < DateTime.Now.AddDays(-7))
                fi.Delete();
        }
    }
    private static void CleanExcelsOlds()
    {
        string[] files2 = Directory.GetFiles("../../Users/Maxi/Source/Repos/13-12-2017_config_pdfListados/ApplicaAccWeb/Uploads/Excels");
        foreach (string file in files2)
        {
            FileInfo fi = new FileInfo(file);
            if (fi.CreationTime < DateTime.Now.AddDays(-7))
                fi.Delete();
        }
    }

我在作为服务运行的控制台应用程序中使用以下命令，以从App.Settings文件获取目录信息。保留文件的天数也是可配置的，乘以-1即可在DateTime.Now的AddDays（）方法中使用。

static void CleanBackupFiles()
        {
            string gstrUncFolder = ConfigurationManager.AppSettings["DropFolderUNC"] + "";
            int iDelAge = Convert.ToInt32(ConfigurationManager.AppSettings["NumDaysToKeepFiles"]) * -1;
            string backupdir = string.Concat(@"\", "Backup", @"\");

            string[] files = Directory.GetFiles(string.Concat(gstrUncFolder, backupdir));


            foreach (string file in files)
            {
                FileInfo fi = new FileInfo(file);
                if (fi.CreationTime < DateTime.Now.AddDays(iDelAge))
                {
                    fi.Delete();
                }
            }

        }

SSIS类型的示例..（如果这可以帮助任何人）

          public void Main()
          {
                 // TODO: Add your code here
        // Author: Allan F 10th May 2019

        //first part of process .. put any files of last Qtr (or older) in Archive area 
        //e.g. if today is 10May2019 then last quarter is 1Jan2019 to 31March2019 .. any files earlier than 31March2019 will be archived

        //string SourceFileFolder = "\\\\adlsaasf11\\users$\\aford05\\Downloads\\stage\\";
        string SourceFilesFolder = (string)Dts.Variables["SourceFilesFolder"].Value;
        string ArchiveFolder = (string)Dts.Variables["ArchiveFolder"].Value;
        string FilePattern = (string)Dts.Variables["FilePattern"].Value;
        string[] files = Directory.GetFiles(SourceFilesFolder, FilePattern);

        //DateTime date = new DateTime(2019, 2, 15);//commented out line .. just for testing the dates .. 

        DateTime date = DateTime.Now;
        int quarterNumber = (date.Month - 1) / 3 + 1;
        DateTime firstDayOfQuarter = new DateTime(date.Year, (quarterNumber - 1) * 3 + 1, 1);
        DateTime lastDayOfQuarter = firstDayOfQuarter.AddMonths(3).AddDays(-1);

        DateTime LastDayOfPriorQuarter = firstDayOfQuarter.AddDays(-1);
        int PrevQuarterNumber = (LastDayOfPriorQuarter.Month - 1) / 3 + 1;
        DateTime firstDayOfLastQuarter = new DateTime(LastDayOfPriorQuarter.Year, (PrevQuarterNumber - 1) * 3 + 1, 1);
        DateTime lastDayOfLastQuarter = firstDayOfLastQuarter.AddMonths(3).AddDays(-1);

        //MessageBox.Show("debug pt2: firstDayOfQuarter" + firstDayOfQuarter.ToString("dd/MM/yyyy"));
        //MessageBox.Show("debug pt2: firstDayOfLastQuarter" + firstDayOfLastQuarter.ToString("dd/MM/yyyy"));


        foreach (string file in files)
        {
            FileInfo fi = new FileInfo(file);

            //MessageBox.Show("debug pt2:" + fi.Name + " " + fi.CreationTime.ToString("dd/MM/yyyy HH:mm") + " " + fi.LastAccessTime.ToString("dd/MM/yyyy HH:mm") + " " + fi.LastWriteTime.ToString("dd/MM/yyyy HH:mm"));
            if (fi.LastWriteTime < firstDayOfQuarter)
            {

                try
                {

                    FileInfo fi2 = new FileInfo(ArchiveFolder);

                    //Ensure that the target does not exist.
                    //fi2.Delete();

                    //Copy the file.
                    fi.CopyTo(ArchiveFolder + fi.Name);
                    //Console.WriteLine("{0} was copied to {1}.", path, ArchiveFolder);

                    //Delete the old location file.
                    fi.Delete();
                    //Console.WriteLine("{0} was successfully deleted.", ArchiveFolder);

                }
                catch (Exception e)
                {
                    //do nothing
                    //Console.WriteLine("The process failed: {0}", e.ToString());
                }
            }
        }

        //second part of process .. delete any files in Archive area dated earlier than last qtr ..
        //e.g. if today is 10May2019 then last quarter is 1Jan2019 to 31March2019 .. any files earlier than 1Jan2019 will be deleted

        string[] archivefiles = Directory.GetFiles(ArchiveFolder, FilePattern);
        foreach (string archivefile in archivefiles)
        {
            FileInfo fi = new FileInfo(archivefile);
            if (fi.LastWriteTime < firstDayOfLastQuarter )
            {
                try
                {
                    fi.Delete();
                }
                catch (Exception e)
                {
                    //do nothing
                }
            }
        }


                 Dts.TaskResult = (int)ScriptResults.Success;
          }

因为与解决方案new FileInfo(filePath)并不容易测试，我建议使用包装像类Directory，File而Path像这样：

public interface IDirectory
{
    string[] GetFiles(string path);
}

public sealed class DirectoryWrapper : IDirectory
{
    public string[] GetFiles(string path) => Directory.GetFiles(path);
}

public interface IFile
{
    void Delete(string path);
    DateTime GetLastAccessTime(string path);
}

public sealed class FileWrapper : IFile
{
    public void Delete(string path) => File.Delete(path);
    public DateTime GetLastAccessTimeUtc(string path) => File.GetLastAccessTimeUtc(path);
}

然后使用类似这样的东西：

public sealed class FooBar
{
    public FooBar(IFile file, IDirectory directory)
    {
        File = file;
        Directory = directory;
    }

    private IFile File { get; }
    private IDirectory Directory { get; }

    public void DeleteFilesBeforeTimestamp(string path, DateTime timestamp)
    {
        if(!Directory.Exists(path))
            throw new DirectoryNotFoundException($"The path {path} was not found.");

        var files = Directory
            .GetFiles(path)
            .Select(p => new
            {
                Path = p,
                // or File.GetLastWriteTime() or File.GetCreationTime() as needed
                LastAccessTimeUtc = File.GetLastAccessTimeUtc(p) 
            })
            .Where(p => p.LastAccessTimeUtc < timestamp);

        foreach(var file in files)
        {
            File.Delete(file.Path);
        }
    }
}

只需创建一个小的删除功能即可帮助您完成此任务，我已经测试了此代码，并且运行良好。

此功能可删除90天以上的文件以及扩展名为.zip的文件，该文件将从文件夹中删除。

Private Sub DeleteZip()

    Dim eachFileInMydirectory As New DirectoryInfo("D:\Test\")
    Dim fileName As IO.FileInfo

    Try
        For Each fileName In eachFileInMydirectory.GetFiles
            If fileName.Extension.Equals("*.zip") AndAlso (Now - fileName.CreationTime).Days > 90 Then
                fileName.Delete()
            End If
        Next

    Catch ex As Exception
        WriteToLogFile("No Files older than 90 days exists be deleted " & ex.Message)
    End Try
End Sub