逐行比较两个文本文件

Question

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,我还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<string> alphaFileContent = new List<string>();

            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
        }

Answer 1

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<String> onlyB = linesB.Except(linesA);

File.WriteAllLines(Path.Combine(directory, "Result.txt"), onlyB);

Answer 2

既然你的问题似乎没有付出任何努力我会给你一个粗略的轮廓.

1. 逐行读取这两个文件,例如用File.ReadAllLines或File.ReadLines.
2. 使用LINQ的Except方法.
3. 将结果写入新文件.