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

我正在比较两个目录中的文件。一个是旧目录( old )，另一个是包含更多文件的新目录( new )。我能够打印显示所有添加的文件的输出，但它只显示结果文件中的一个文件，我实际上希望它在其中运行。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

您可以在每次迭代中通过foreach循环创建一个新的StreamWriter。默认情况下，StreamWriter覆盖文件内容。

最好的解决方案是改变您的循环，这样看起来就像

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

您还可以指定StreamWriter应该追加，而不是替换文件：new StreamWriter(Result, append: true)。但最好只打开文件一次。

Answer 2

您可以试试这个，我没有证明代码您可能需要修改一些东西。

IEnumerable<FileInfo> list1 = dir1.GetFiles("*.*", SearchOption.AllDirectories);
IEnumerable<FileInfo> list2 = dir2.GetFiles("*.*", SearchOption.AllDirectories);
IEnumerable<FileInfo> DifferentFiles;
//if neww dir has more files than old dir
int j;
foreach ( var dir in list1 )
{
    j=1;
    for (int i=0; i<list2.count; i++) 
    {   
        if (!compare.Equals(dir1,list2[i])) j++
    }
    if (j==list2.count){
        //dir1 is not in list2
        DifferentFiles.Add(dir1);
    }
}
/*
//Add this code to know if there are directories in List2  that are not in list1
//ass the first for is not proving it. 
foreach ( var dir2 in list2 )
{
    j=1;
    for (int i=0; i<list1.count; i++) 
    {   
        if (!compare.Equals(dir2,list1[i])) j++
    }
    if (j==list1.count){
        //dir2 is not in list1
        if(!DifferentFiles.Contains(dir2)) DifferentFiles.Add(dir2);    
    }
}
*/

StreamWriter file = new StreamWriter(Result);
//if 2 for is not added
file.WriteLine("The following files in the new Directory are not in the Old one:");
//if 2 for is added
    //file.WriteLine("The following files are not in both directories");
file.WriteLine("");
foreach(var result in DifferentFiles)
{
    file.WriteLine(result.Name + "\n", true);
        Console.WriteLine(result.Name);
}
file.Close();