Question

我用代码打开一个.csv文件，我希望选择一个定界符并定义列（标题名称）。我需要知道如何定义它们。我使用以下方式生成文件：

fnresultfile = new StreamWriter("Resultfile_" + DateTime.Now.ToString("yyyyMMdd_HHmmss") + ".csv", true); //Filename

fnresultfile.WriteLine("Data recorded on date : " + DateTime.Now);  
fnresultfile.WriteLine("The parameters of this Test Sequence were set to :");
fnresultfile.WriteLine("X =" + Xactual + ",Y =" + Yactual + ",Z =" + Zactual);
fnresultfile.WriteLine("Key Orientation = " + Key_OrientationBox.Text);

fnresultfile.Close();

Answer 1

CSV文件只是一个文本文件。按照约定/协议，它会将数据保存在带有记录的行中，并以逗号（“，”或“;”）分隔。有或没有标题（标题）。

因此，您可以像添加示例中的数据一样添加列标题。和分隔符一样，您也可以将其添加为变量，就像添加数据一样。

不确定您的示例是否正在编写列标题。如果是这样，下面有一个示例。例如，您可以更改字符串数组以首先使用StringBuilder建立数据。

using System;
using System.IO;

// Based on an example from Microsoft: https://docs.microsoft.com/en-us/dotnet/standard/io/how-to-write-text-to-a-file
class Program
{
    static void Main(string[] args)
    {
        string delimitor = ",";

        // Create a string array with the lines of text
        string[] lines = 
        { 
           $"data record 1,data record 2,data record 3,data record 4", // First data line
           $"data record 1,data record 2,data record 3,data record 4", // Second data line
           $"data record 1,data record 2,data record 3,data record 4"  // Third data line
        };

        var filename = "Resultfile_" + DateTime.Now.ToString("yyyyMMdd_HHmmss") + ".csv"

        // Set a variable to the Documents path.
        string docPath =
            Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

        // Write the string array to a new file named "WriteLines.txt".
        using (StreamWriter outputFile = new StreamWriter(Path.Combine(docPath, filename)))
        {
            foreach (string line in lines)
                outputFile.WriteLine(line);
        }
    }
}

结果将是：

Data recorded on date,The parameters of this Test Sequence were set to,X,Key Orientation
data record 1,data record 2,data record 3,data record 4
data record 1,data record 2,data record 3,data record 4
data record 1,data record 2,data record 3,data record 4

Answer 2

使用string.Join（）方法：

           string[] line = { 
                                "Data recorded on date : " + DateTime.Now, 
                                "The parameters of this Test Sequence were set to :",
                                "X =" + Xactual + ",Y =" + Yactual + ",Z =" + Zactual,
                                "Key Orientation = " + Key_OrientationBox.Text,
                            };
            string separator = ",";

            fnresultfile.WriteLine(string.Join(separator,line));
            fnresultfile.Close();

CSV文件中的问题：分隔符和列标题声明

2 个答案: