C# 逐行比较两个文本文件
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Compare two text files line by line
提问by Developman
Beneath here i described a example Scenario:
下面我描述了一个示例场景：
"FileA-Database.txt" contains the following names:
“FileA-Database.txt”包含以下名称：
KB200
KB200
KB300
KB300
KB400
KB400
"FileB-Slave.txt" contains the following names:
“FileB-Slave.txt”包含以下名称：
KB600
KB600
KB200
KB200
KB400
KB400
KB700
KB700
I want to compare the "FileA-Database.txt" with "FileB-Slave.txt" and let the missing values be filled in automatically in the "FileA-Database.txt" file also i need to display the missing values in a text file called "Results.txt".
我想将“FileA-Database.txt”与“FileB-Slave.txt”进行比较，并让缺失值自动填充到“FileA-Database.txt”文件中，我还需要在文本中显示缺失值名为“Results.txt”的文件。
The code needs to be compatible with C# (framework 4.0+) please!.
代码需要与 C#（框架 4.0+）兼容！。
I need a simple approach, mine doesnt work exactly the way i want it to:
我需要一个简单的方法，我的方法并不完全按照我想要的方式工作：
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
}
采纳答案by Tommaso Belluzzo
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);
回答by Joey
Since your question seems like you made no effort whatsoever I'll give you just a rough outline.
既然你的问题似乎你没有做任何努力，我就给你一个粗略的概述。
- Read both files line by line, e.g. with
File.ReadAllLinesorFile.ReadLines. - Use LINQ's
Exceptmethod. - Write the results into a new file.
- 逐行读取两个文件，例如使用
File.ReadAllLines或File.ReadLines。 - 使用 LINQ 的
Except方法。 - 将结果写入新文件。
