Question

我想阅读CSV文件，带标题的选定列将保存在另一个新的CSV中。

*我想为我的代码添加以下要求。*请帮我添加这些代码。

在这里我考虑这个要求; Age >=25 && Marks0 ==True以此名称Pass.csv保存此.csv文件中的标题列(Index,Age,Marks0)

其他要求是Age >=20 && Age <=25 & Marks1 ==False以此名称General.csv保存此.csv文件中的标题下列(Index,Age,Marks0,Marks1)

其他人保存在Ignore.csv标题(Index,Age,Marks0,Marks1,Marks2,Marks3)

中

这是我的样本.CSV文件

Index,Age,Marks0,Marks 1,Marks2,Marks3
1,22,TRUE,FALSE,FALSE,FALSE
2,30,TRUE,TRUE,FALSE,FALSE
3,19,TRUE,TRUE,FALSE,FALSE
4,25,TRUE,TRUE,FALSE,FALSE
5,22,TRUE,TRUE,FALSE,FALSE
6,26,TRUE,TRUE,FALSE,FALSE
7,27,TRUE,FALSE,FALSE,TRUE
8,29,TRUE,FALSE,FALSE,TRUE
9,25,TRUE,FALSE,FALSE,TRUE
10,22,TRUE,FALSE,FALSE,TRUE
11,23,TRUE,FALSE,FALSE,TRUE

我创建了一个类来存储我的列值

class Marks

    {
        public int Index { get; set; } // property to  store Index
        public int Age { get; set; } // property to store Age 
        public bool Marks0 { get; set; } // property to store Marks0 
        public bool Marks01 { get; set; } // property to store Marks01 
        public bool Marks2 { get; set; } // property to store Marks2 
        public bool Marks3 { get; set; } // property to store Marks3

    }

阅读.CSV文件的代码如下;

private void button1_Click(object sender, EventArgs e)
    {
               List<Marks> Observing1 = new List<Marks>(); // List to store all available Marks objects from the CSV
                Marks statusInt = new Marks();
                // Loops through each lines in the CSV
                foreach (string line in System.IO.File.ReadAllLines(OutputFilePath.Text).Skip(1)) // .Skip(1) is for skipping header
                {
                    // here line stands for each line in the CSV file

                    string[] InCsvLine = line.Split(',');
                    statusInt.Index=int.Parse(InCsvLine[0]); 
                    statusInt.Age=int.Parse(InCsvLine[1]);      
                    statusInt.Mark0 = (InCsvLine[2] == "TRUE" ? true : false);
                    statusInt.Mark1 = (InCsvLine[3] == "TRUE" ? true : false);
                    statusInt.Mark2 = (InCsvLine[4] == "TRUE" ? true : false);
                    statusInt.Mark3 = (InCsvLine[5] == "TRUE" ? true : false);

                }

    }

请为解决我的问题提供任何帮助。

Answer 1

我发现了多个问题，但为了帮助您入门，您可以像这样从csv中分隔列：

        var recordsToSaveInPassFile = new List<Class>();
        var recordsToSaveInGeneralFile = new List<Class>();

        var lines = File.ReadAllLines(@"C:\temp\data.csv", Encoding.GetEncoding(1252));

        foreach (var line in lines)
        {
            var items = line.Split(';');

            int parsedAge;

            if (int.TryParse(items[0], out parsedAge))
            {
                if(parsedAge > 24)
                {
                   var recordToPass = new Class
                   {
                    Age = items[0],
                    item2 = items[1]
                   };

                   recordsToSaveInPassFile.Add(recordToPass);
                }
                else if(parsedAge > 19)
                {
                   var recordToGeneral = new Class
                   {
                    Age = items[0],
                    item2 = items[1]
                    };

                   recordsToSaveInGeneralFile.Add(recordToGeneral);
                }

                continue;
            }

            Console.WriteLine($@"'{line}': could not be parsed");
        }

这可以做得更好，但这可能会让您了解如何从csv文件中检查不同的值。

Answer 2

我在评论中谈到的是：

List<Marks> Observing1 = new List<Marks>(); // List to store all available Marks objects from the CSV
// Marks statusInt = new Marks(); <<<<<< Move into loop!
// Loops through each lines in the CSV
foreach (string line in System.IO.File.ReadAllLines(OutputFilePath.Text).Skip(1)) // .Skip(1) is for skipping header
{
    var statusInt = new Marks();

    // here line stands for each line in the CSV file
    string[] InCsvLine = line.Split(',');
    statusInt.Index=int.Parse(valuesInCsvLine[0]); 
    statusInt.Age=int.Parse(valuesInCsvLine[1]);      
    statusInt.Mark0 = (InCsvLine[2] == "TRUE" ? true : false);
    statusInt.Mark1 = (InCsvLine[3] == "TRUE" ? true : false);
    statusInt.Mark2 = (InCsvLine[4] == "TRUE" ? true : false);
    statusInt.Mark3 = (InCsvLine[5] == "TRUE" ? true : false);

    // Add your result to the List!
    Observing1.Add(stsusInt);
}

// Now you can filter as you wish
var filteredByAge = Observing1.Where( x => x.Age > 25 ).ToList();

// Writing to a new File is left as assignment for OP

如何将选定的列与.CSV文件分开，并将其保存在带有C＃头文件的新.csv文件中

2 个答案: