Question

流写器的主要目标（在下面的代码中）应该只报告已删除的目录。如果早于设置日期，则删除目录。但是，流写器只写入最后一个目录而不是已删除的项目。我很新，并试图了解我做错了什么，感谢任何帮助。

程序

using System;
using System.IO;
using System.Configuration;
using System.Text;

public class Program
{


    static void Main(string[] args)
    {
        //number of days from App.config
        String daysPast = ConfigurationManager.AppSettings["TimeSpan"];

        String path = ConfigurationManager.AppSettings["FilePath"];

        // Reference to a directory.
        DirectoryInfo di = new DirectoryInfo(path);

        // Reference to each directory in that directory.
        DirectoryInfo[] diArr = di.GetDirectories();


        //StreamWriter file name
        string fileName = "fileResults_" + DateTime.Now.ToString("yyyy-MM-dd-HH-mm") + ".txt";

        try
        {
            foreach (DirectoryInfo dir in diArr)
            {
                if (dir.LastWriteTime < DateTime.Parse(daysPast))
                    Directory.Delete(dir.FullName, true);


                using (StreamWriter sw = new StreamWriter(fileName, false))
                {
                    foreach (DirectoryInfo FilePath in di.GetDirectories())
                    {
                        sw.WriteLine("File(s) deleted on: " + DateTime.Now);
                        sw.WriteLine("============================================");
                        sw.WriteLine("");
                        sw.WriteLine(dir.FullName,false);
                        sw.WriteLine("");
                        sw.WriteLine("End of list");
                        sw.WriteLine("");
                        sw.Flush();
                    }
                }
            }
        }

        catch (InvalidCastException)
        {
            Console.WriteLine("There was an issue, please try again.");
        }
    }
}

App.Config中

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="FilePath" value="C:\testFolder\" /><!--root folder -->
    <add key="TimeSpan" value="-2.00:00:00"/><!--adjust days  -->
  </appSettings>
</configuration>

Answer 1

每次使用foreach (DirectoryInfo dir in diArr)进行迭代时，都会重写文件。

此外，如果您的if (dir.LastWriteTime < DateTime.Parse(daysPast))块没有大括号，则只有下一行代码（Directory.Delete(dir.FullName, true);）将依赖于该条件，因此using (StreamWriter sw = new StreamWriter(fileName, false))将为每个执行目录，因此它总是只写最后一个文件。

你需要（在try区块内）是否像这样：

List<string> deletedDirectories = new List<string>();

foreach (DirectoryInfo dir in diArr)
{
    if (dir.LastWriteTime < DateTime.Parse(daysPast))
    {
        Directory.Delete(dir.FullName, true);
        deletedDirectories.Add(dir.FullName);
    }
}

using (StreamWriter sw = new StreamWriter(fileName, false))
{
    sw.WriteLine("File(s) deleted on: " + DateTime.Now);
    sw.WriteLine("============================================");
    sw.WriteLine("");

    foreach (string deletedDirectory in deletedDirectories)
    {
        sw.WriteLine(deletedDirectory);
    }

    sw.WriteLine("");
    sw.WriteLine("End of list");
    sw.WriteLine("");
}

这会将已删除的目录存储在列表中，然后在删除循环结束后将它们写入文件。

Streamwriter未列出已删除的文件夹

1 个答案: