将两个目录与​​文件进行比较,然后在另一个文件中给出结果差异.C#

Question

我将两个目录与​​其中的文件进行比较.一个是旧目录(旧),另一个是新目录(New),其中包含更多文件.我能够打印输出显示所有添加的文件,但它只显示结果文件中我真正希望它去的一个文件.如何让它显示结果文件中添加的所有文件？

Visual Studio上的输出

结果文件中的输出

这是我的代码:

public Form1()
{
    InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{      
    String New = @"C:\Compare\New";
    String Old = @"C:\Compare\Old";
    String Result = @"C:\Compare\Result";
    DirectoryInfo dir1 = new DirectoryInfo(New);
    DirectoryInfo dir2 = new DirectoryInfo(Old);

    // Take a look of the file system.  
    IEnumerable<FileInfo> list1 = dir1.GetFiles("*.*", SearchOption.AllDirectories);
    IEnumerable<FileInfo> list2 = dir2.GetFiles("*.*", SearchOption.AllDirectories);

    //A custom file comparer defined below  
    FileCompare compare = new FileCompare();

    // Check if same or not.
    // bool because of FileCompare
    bool areSame = list1.SequenceEqual(list2, compare);

    if (areSame == true)
    {
        MessageBox.Show("The Directories match.");
    }
    else
    {
        MessageBox.Show("Directories do not the same.. Please Review 'Result.text'.");
    }

    // Find the set difference between the two folders.  
    // Print to the result.txt
    var difFromOld = (from file in list1
            select file).Except(list2, compare);

        foreach (var result in difFromIOld)
        {
            StreamWriter file = new StreamWriter(Result);
            file.WriteLine("The following files do not match between Directories:");
            file.WriteLine("");
            file.WriteLine(result.Name + "\n", true);
            file.Close();
            Console.WriteLine(result.Name);
        }
}
}


class FileCompare : IEqualityComparer<FileInfo>
{
    public FileCompare() { }

    public bool Equals(FileInfo f1, FileInfo f2)
    {
        return (f1.Name == f2.Name && f1.Length == f2.Length);
    }

    public int GetHashCode(FileInfo fi)
    {
        string s = String.Format("{0}{1}", fi.Name, fi.Length);
        return s.GetHashCode();
    }
}

Answer 1

您可以通过foreach循环在每次迭代中创建一个新的StreamWriter.默认情况下,StreamWriter会覆盖文件内容.

最好的解决方案是改变你的循环,看起来像

using(var file = new StreamWriter(Result)) {
  foreach (var result in difFromIOld)
  {
  /* Write to 'file' here */
  }
}

您还可以指定StreamWriter应附加到,而不是替换文件:new StreamWriter(Result, append: true).但最好只打开一次文件.