Question

我想显示每个名字的最后一行。文本文件中有许多名称，一个名称包含50多行。我想从文本文件中显示每个名字的最后一行。

请查看此链接，大家都会明白。

有黄油和苹果等名称。黄油包含9行，苹果包含苹果包含22行。我想在苹果中显示第9行黄油和第22行

提前致谢。

我使用此代码显示所有行，但我想在苹果中显示黄油和第22行的第9行。

static void Main(string[] args)
{
    int counter = 0;
    string line;

    // Read the file and display it line by line. 
    System.IO.StreamReader file = new System.IO.StreamReader("c:\\tra\\20100901.txt");
    while ((line = file.ReadLine()) != null)
    {
        if (line.Contains("apple"))
        {
            Console.WriteLine(counter.ToString() + ": " + line);
        }

        counter++;
    }

    file.Close();  
}

Answer 1

public static string ReturnTheNameBetweenCommas(string str)
{
    int indexOfTheFirstComma = str.IndexOf(',');//find the first comma index
    string strAfterTheFirstComma = str.SubString(indexOfTheFirstComma +1);//take the rest after the first comma
    indexOfTheFirstComma = strAfterTheFirstComma.IndexOf(',');
    string theNameBetweenFirstTwoCommas = strAfterTheFirstComma.SubString(0,indexOfTheFirstComma-1);

  return strAfterTheFirstComma;       

}

public class NameAndOccurence
{
    public string Name{ get; set; }
    public int Occurence{ get; set; }
}

public static void Method()
{
    List<string> listOfLines = new List<string>();
    //Read all the lines to listOfLines one by one, use listOfLines.Add(line) every line as an element of the list
    List<string> listOfDistinctNames = new List<string>();

    foreach(var item in listOfLines)
    {
         string nameInTheLine = ReturnTheNameBetweenCommas(item);

         if(!listOfDistinctNames.Contains(nameInTheLine))
         {
           listOfDistinctNames.Add(nameInTheLine);
         }
    }

    List<NameAndOccurence> listOfNameAndOccurence = new List<NameAndOccurence>();

    foreach(var nameStr in listOfDistinctNames)
    {
       NameAndOccurence nameAndOccr = new NameAndOccurence();

       int occurence = 0        

       foreach(var lineStr in listOfLines)
       {
           if(lineStr.Contains(nameStr))
           {
              occurence++;
           }
           else
           {
               nameAndOccr.Name = nameStr;
               nameAndOccr.Occurence = occurence;

               listOfNameAndOccurence.Add(nameAndOccr);                   
           }
       }

    }
    //now you've got the names in the lines and how many times they occurred
    //for example for the image you showed there are 10 lines with the name of Butter-1M
    //so in your listOfNameAndOccurence you have an object like this
    //nameAndOccurence.Name is "Butter-1M" and nameAndOccurence.Occurence is 10
    //you've got one for Apple too.
    //Well after that all you gotta do is writing the 10th line of the textfile for Butter-1M

}

是否清楚？

如何显示每个名称文本文件的最后一行

1 个答案: