Question

我想使用第二和第四列从.csv文件中绘制图形。数据从第9行开始，我可以跳过8行。但是我想访问用于绘制图形的特定列。

string ChosenFile = "";

if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
    ChosenFile = openFileDialog1.FileName;
    char delimited = ',';

    if (new FileInfo(ChosenFile).Length != 0)
    {
        try
        {
            var data = File.ReadLines(@ChosenFile).Skip(8)
               .Select(line => line.Split(new Char[] { delimited }, StringSplitOptions.RemoveEmptyEntries))
               .Select(chunk => chunk
               .Select(x => Double.Parse(x, CultureInfo.InvariantCulture))
               .ToArray());

            series.Points.Clear();
            foreach (var pair in data)
            {
                series.Points.AddXY(pair[0], pair[1]);                          
            }
       }
        catch
        {
            logger.info("The file " + openFileDialog1.FileName + " cannot be opened because the content may be invalid or damaged.");
        }
    }
    else logger.info(openFileDialog1.FileName + " is an empty file.");
}

此LINQ语句仅访问前两列，但对于我的应用程序，我需要访问第二列和第四列的数据我需要在此语句中进行哪些更改才能获得这些列？

Answer 1

首先让我们解决您的问题。数据中的每一列都可以通过索引访问。

char delimited = ',';
var inputCSV = @"Skip it
Skip ita
Skip it
Col1,Col2,Foo,Bar
2.3,0.2,3.0,40.5
2.3,0.2,3.0,40.5
2.3,0.2,3.0,40.5";

var fileReadLinesMimic = inputCSV
                    .Split(new[] { Environment.NewLine }, StringSplitOptions.None);
var data = fileReadLinesMimic
            .Skip(4)
            .Select(line => line.Split(new Char[] { delimited }, StringSplitOptions.RemoveEmptyEntries))
            .Select(chunk =>
                chunk.Select(x => Double.Parse(x, CultureInfo.InvariantCulture)
            )
            .ToArray());

foreach (var item in data)
{
    Console.WriteLine($"Col1={item[0]}; Col2={item[1]}; Foo={item[2]}; Bar={item[3]};");
}

使用OpenFileDialog从CSV文件读取特定的列

1 个答案: