逐行比较两个文本文件

在这里我描述了一个示例场景：

“FileA-Database.txt”包含以下名称：

KB200

KB300

KB400

“FileB-Slave.txt”包含以下名称：

KB600

KB200

KB400

KB700

我想将“FileA-Database.txt”与“FileB-Slave.txt”进行比较，并在“FileA-Database.txt”文件中自动填写缺失值，同时我需要在文本中显示缺失值文件名为“Results.txt”。

代码需要与C＃（框架4.0+）兼容！

我需要一个简单的方法，我的工作方式与我想要的完全不同：

private void button_compare_Click(object sender, EventArgs e) { string fileA, fileB, fileC; fileA = "database-critical.txt"; fileB = "patchlist.txt"; fileC = "result.txt"; string alphaFilePath = fileA; List alphaFileContent = new List(); using (FileStream fs = new FileStream(alphaFilePath, FileMode.Open)) using(StreamReader rdr = new StreamReader(fs)) { while(!rdr.EndOfStream) { alphaFileContent.Add(rdr.ReadLine()); } } string betaFilePath = fileB; StringBuilder sb = new StringBuilder(); using (FileStream fs = new FileStream(betaFilePath, FileMode.Open)) using (StreamReader rdr = new StreamReader(fs)) { while(! rdr.EndOfStream) { string[] betaFileLine = rdr.ReadLine().Split(Convert.ToChar(",")); if (alphaFileContent.Contains(betaFileLine[0])) { sb.AppendLine(String.Format("{0}", betaFileLine[0])); } } } using (FileStream fs = new FileStream(fileC, FileMode.Create)) using (StreamWriter writer = new StreamWriter(fs)) { writer.Write(sb.ToString()); } } //End } 

 String directory = @"C:Whatever"; String[] linesA = File.ReadAllLines(Path.Combine(directory, "FileA-Database.txt")); String[] linesB = File.ReadAllLines(Path.Combine(directory, "FileB-Database.txt")); IEnumerable onlyB = linesB.Except(linesA); File.WriteAllLines(Path.Combine(directory, "Result.txt"), onlyB);