读写文本文件 [英] Read and write the text file

问题描述

请为我提供以下任务的建议。



C＃执行程序给出文本文件到输出文本文件



输入.txt



Col1 Col2

Id1 Val1

Id2 Val2

Id3 Val3

1d1 Val4

Id4 Val5

Id2 Val6

Idn



ouput.txt



Col1 Col2

Id1 Val1; val4

Id2 Val2; val6

Id3 Val3

Id4 Val5

Hi ,

Please provide me advise on below task.

C# Program to Execute given text file into output text file

Input.txt

Col1 Col2
Id1 Val1
Id2 Val2
Id3 Val3
1d1 Val4
Id4 Val5
Id2 Val6
Idn

ouput.txt

Col1 Col2
Id1 Val1;val4
Id2 Val2;val6
Id3 Val3
Id4 Val5

推荐答案

您好，



试试这个：

Hi,

Try this:

// For store input data;
var data = new Dictionary<string, List<string>>();

// Load data from file
using (var streamReader = new StreamReader(@"D:\input.txt"))
{
    while(!streamReader.EndOfStream)
    {
        var line = streamReader.ReadLine();
        var items = line.Split(" ".ToCharArray());
        var id = items[0];
        var value = items[1];
        if (!data.ContainsKey(id))
        {
            data.Add(id, new List<string>());
        }
        data[id].Add(value);
    }
}

// Sava file
using (var streamWriter = new StreamWriter(@"D:\output.txt"))
{
    foreach (var key in data.Keys)
    {
        var values = string.Join(";", data[key]);
        streamWriter.WriteLine(string.Format("{0} {1}", key, values));
    }
}

一些教育链接：

http://msdn.microsoft.com/en-us/library/ vstudio / system.io.streamreader％28v = vs.90％29 [ ^ ]

http://msdn.microsoft.com/en-us/library/vstudio/system.io.streamwriter%28v=vs.90 ％29 [ ^ ]

http://msdn.microsoft.com/en-us/library/vstudio/xfhwa508%28v=vs.100%29.aspx [ ^ ]

http://msdn.microsoft.com/en-us/library/system.collections%28v=vs.110%29.aspx [ ^ ]



干杯！

Some links for education:
http://msdn.microsoft.com/en-us/library/vstudio/system.io.streamreader%28v=vs.90%29[^]
http://msdn.microsoft.com/en-us/library/vstudio/system.io.streamwriter%28v=vs.90%29[^]
http://msdn.microsoft.com/en-us/library/vstudio/xfhwa508%28v=vs.100%29.aspx[^]
http://msdn.microsoft.com/en-us/library/system.collections%28v=vs.110%29.aspx[^]

Cheers!

嗨请试试这个

Hi Please try this

string[] lines = System.IO.File.ReadAllLines(@"E:\Test\Input.txt");

            var r = from x in lines.Select(x => x.Split('\t')).OrderBy(x=>x[0])
                    group x by x[0] into p
                    select p;
            string Value = string.Empty;
            string Key = string.Empty;
            
            using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"E:\Test\Output.txt"))
            {
            foreach (var n in r)
            {
                Console.WriteLine(n.Key);
                Key = n.Key;
                foreach (var l in n)
                {
                    Value = Value + l[1] + ";";
                }
                file.WriteLine(Key + " " + Value);

                Value = "";
            }
            }

我找到了一个解决方案。请找到下面的代码。

Hi ,

I found one solution . Please find the below code.

string[] lines = System.IO.File.ReadAllLines(@"input.txt");
            string fnString = "", keyStr = "";
            ArrayList arLst = new ArrayList();
            arLst.Add("Col1 Col2");
            for (int i = 1; i < lines.Count(); i++)
            {
                fnString = ""; keyStr = "";
                if (lines[i].Trim() != "")
                {
                    string[] arrRow = lines[i].Split(' ');
                    for (int j = 1; j < lines.Count(); j++)
                    {
                        if (lines[j].Trim() != "")
                        {
                            string[] arrRow1 = lines[j].Split(' ');
                            keyStr = arrRow[0];
                            if (arrRow[0].Equals(arrRow1[0]))
                            {
                                fnString += arrRow1[1] + ";";
                                lines[j] = "";
                            }
                        }
                    }
                    if (fnString.EndsWith(";"))
                        fnString = fnString.Substring(0, fnString.Length - 1);
                    arLst.Add(keyStr + ' ' + fnString);
                }
            }
            using (var streamWriter = new StreamWriter(@"output.txt"))
            {
                for (int i = 0; i < arLst.Count; i++)
                {
                    streamWriter.WriteLine(arLst[i]);
                }
                streamWriter.Close();
            }

这篇关于读写文本文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！