CSV 文件中的问题：分隔符和列标题声明

Question

我在我的代码中打开一个 .csv 文件，我希望给出我选择的分隔符并定义列（标题名称）。我需要知道如何定义它们。我使用以下方式来生成我的文件：

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。 根据约定/协议，它将数据保存在带有记录的行中，这些记录由逗号（'，'或';'）分隔。有或没有标题（标题）。

因此，您可以像在示例中添加数据一样添加列标题。 分隔符也可以作为变量添加，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，下面有一个例子。例如，您可以更改字符串数组以首先使用 StringBuilder 构建数据。

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();