比较两个文本文件

Question

我有两个文本文件bala.txt和bala1.txt

bala.txt包含文本行线

balamurugan,rajendran,chendurpandian 
christopher 
updateba 

bala1.txt包含文本行线

ba 

在这里，我需要检查bala1.txt与bala.txt并写入日志文件为

LineNo : 0 : balamurugan,rajendran,chendurpandian 
LineNo : 2 : updateba 

现在它的写作只有一条线作为

LineNo : 0 : balamurugan,rajendran,chendurpandian 

，虽然循环后失控

这里是我的代码

while (((line = file.ReadLine()) != null & (line2 = file2.ReadLine()) != null)) 
         { 
          if (line.Contains(line2)) 
          { 
           dest.WriteLine("LineNo : " + counter.ToString() + " : " + line + "<br />"); 
          } 
          counter++; 
         } 

任何建议？

编辑：

string FilePath = txtBoxInput.Text; 
    string Filepath2 = TextBox1.Text; 
    int counter = 0; 
    string line; 
    string line2; 


     DirectoryInfo Folder = new DirectoryInfo(textboxPath.Text); 
     var dir = @"D:\New folder\log"; 

     if (Folder.Exists) 
     { 
      if (!Directory.Exists(dir)) 
       Directory.CreateDirectory(dir); 
     } 
     if (File.Exists(FilePath) & File.Exists(Filepath2)) 
     { 
      // Read the file and display it line by line. 
      using (var file = File.OpenText(FilePath)) 
      using (var file2 = File.OpenText(Filepath2)) 
      using (var dest = File.AppendText(Path.Combine(dir, "log.txt"))) 
      { 
       while (((line = file.ReadLine()) != null & (line2 = file2.ReadLine()) != null)) 
       { 
        if (line.Contains(line2)) 
        { 
         dest.WriteLine("LineNo : " + counter.ToString() + " : " + line + "<br />"); 
        } 

        counter++; 
       } 

      } 

}

EDIT（2）： 我需要创建两个文本文件到文件夹中的日志，并与内容

LineNo : 0 : balamurugan,rajendran,chendurpandian 
LineNo : 2 : updateba 

写入文本文件作为 ba.txt

and ra.txt with contents as

LineNo : 0 : balamurugan,rajendran,chendurpandian 

任何建议？

EDIT（3）： 我需要通过代码，并在日志文件夹中创建名为Log文件夹ba.txt和ra.txt必须创建。

Answer 1

试试这个：

string FilePath = txtBoxInput.Text, Filepath2 = TextBox1.Text; 
int counter = 0; 
string line, line2; 

DirectoryInfo Folder = new DirectoryInfo(textboxPath.Text); 
var dir = @"D:\New folder\log"; 

if (Folder.Exists) 
    if (!Directory.Exists(dir)) Directory.CreateDirectory(dir); 

if (File.Exists(FilePath) && File.Exists(Filepath2)) 
{ // Read the file and display it line by line. 
    using (var file = File.OpenText(FilePath)) 
    { 
     using (var file2 = File.OpenText(Filepath2)) 
     { 
      while((line2 = file2.ReadLine()) != null) 
      { 
       //YOU NEED TO CHECK IF FILE ALREADY EXISTS 
       // AND YOU WANT TO OVERWRITE OR CREATE NEW 
       //WITH SOME OTHER NAME 
       //---------------------------------------CREATE NEW FILE FOR 
       //---------------------------------------EACH LINE IN file2 
       using (var dest = File.AppendText(Path.Combine(dir, line2 + ".txt"))) 
       { 
        while ((line = file.ReadLine()) != null) 
        { 
         if (line.Contains(line2)) 
          dest.WriteLine("LineNo : " + 
           counter.ToString() + " : " + line + "<br />"); 
         counter++; 
        } 
        //IF THE SECOND FILE ONLY CONTAINS 1 LINE THEN YOU 
        //DON'T NEED THIS. 
        //we need to go to begning of first file 
        file.BaseStream.Seek(0, SeekOrigin.Begin); 
        counter = 0; 
       } 
      } 
     } 
    } 
} 

编辑：从用户那里获取文件的路径。

如果要获取目录名称来保存日志文件，请给出一个按钮以打开文件对话框以选择文件或文件夹浏览器对话框。

//OPEN FILE -- you will need two buttons one 
//for each text boxes 
void btnFile_Click(object sender, EventArgs e) 
{ 
    var fbd = new OpenFileDialog(); 
    fbd.Multiselect = false; 
    fbd.CheckFileExists = true; 
    fbd.CheckPathExists = true; 
    if(fbd.ShowDialog()==DialogResult.Ok) 
    { 
     textBox1.Text = fbd.FileName; 
    } 
} 

//SELECT FOLDER 
string _logFolderPath;//use this inplace of @"D:\new folder\log"; 
void btnFolder_click(object sender, EventArgs e) 
{ 
    var fd = new FolderBrowserDialog(); 
    if(fd.ShowDialog()==DialogResult.OK) 
    { 
     _logFolderPath = fd.SelectedPath; 
    } 
} 

Answer 2

第二个文件读取器的基础流到达流的末尾，并且在下一次循环迭代之前未被重置。在比较之前，您需要将每个文件的所有行复制到内存中。试试这个：

List<string> file1Lines = new List<string>(); 
List<string> file2Lines = new List<string>(); 

while ((line = file.ReadLine()) != null) 
{ 
    file1Lines.Add(line); 
} 

while ((line2 = file2.ReadLine()) != null) 
{ 
    file2Lines.Add(line2); 
} 

foreach (string f1line in file1Lines) 
{ 
    foreach (string f2line in file2Lines) 
    { 
     if (f1line.Contains(f2line)) 
     { 
      dest.WriteLine("LineNo : " + counter.ToString() + " : " + f1line + "<br />"); 
     } 

    } 
    counter++; 
} 

Answer 3

private void Comparer(string fileLocation1, string fileLocation2, string resultLocation) 
{ 
    StreamReader source = new StreamReader(fileLocation1); 
    StreamReader pattern = new StreamReader(fileLocation2); 
    StreamWriter result = File.CreateText(resultLocation); 

    //reading patterns 
    List<String> T = new List<string>(); 
    string line; 
    while ((line = pattern.ReadLine()) != null) 
     T.Add(line); 
    pattern.Close(); 

    //finding matches and write them in output 
    int counter = 0; 
    while ((line = source.ReadLine()) != null) 
    { 
     foreach (string pat in T) 
     { 
      if (line.Contains(pat)) 
      { 
       result.WriteLine("LineNo : " + counter.ToString() + " : " + line); 
       break; //just if you want distinct output 
      } 
     } 
     counter++; 
    } 

    source.Close(); 
    result.Close(); 
} 

----------------------------编辑----------- ----------------------- 为你在评论中提到的一个

private void Comparer(string fileLocation1, string fileLocation2, string resultFolder) 
{ 
    StreamReader source = new StreamReader(fileLocation1); 
    StreamReader pattern = new StreamReader(fileLocation2); 
    Directory.CreateDirectory(resultFolder); 
    //reading patterns 
    List<String> T = new List<string>(); 
    string line; 
    while ((line = pattern.ReadLine()) != null) 
     T.Add(line); 
    pattern.Close(); 

    //finding matches and write them in output 
    int counter; 
    foreach (string pat in T) 
    { 
     StreamWriter result = File.CreateText(Path.Combine(resultFolder, pat + ".txt")); 
     source.BaseStream.Position = counter = 0; 
     while ((line = source.ReadLine()) != null) 
     { 
      if (line.Contains(pat)) 
       result.WriteLine("LineNo : " + counter.ToString() + " : " + line); 
      counter++; 
     } 
     result.Close(); 
    } 
    source.Close(); 
}