导出mutiline数据到CSV同一细胞

Question

据我所知，这个问题已经被问了很多次（1，2＆3），但我就是不明白如何在我的案件，不适用它。我曾尝试玩好几个小时，但我无法得到它的权利。

我在List<string>where每个列表的形式变量包含有他们之间/多数据换行符DATAS。然后我打电话，将在一个CSV文件导出这些DATAS的事件。下面是我的代码。

savestate.cs - 类，我初始化变量

public partial class Savestate
 { 
    public static List<string> rtb1_list = new List<string>();
    public static List<string> rtb2_list = new List<string>();
    public static List<string> rtb3_list = new List<string>();
    public static List<string> rtb4_list = new List<string>();
 }

Form1.cs的 - 事件

public void Savetocsv()
    {
      Type s = typeof(Savestate);
      FieldInfo[] fields = s.GetFields(BindingFlags.Public | BindingFlags.Static);

      StringBuilder csvdata = new StringBuilder();
      string header = String.Join(",", fields.Select(f => f.Name).ToArray());
      csvdata.AppendLine(header);

      string rtb1 = String.Join(",", Savestate.rtb1_list.ToArray());
      string rtb2 = String.Join(",", Savestate.rtb2_list.ToArray());
      string rtb3 = String.Join(",", Savestate.rtb3_list.ToArray());
      string rtb4 = String.Join(",", Savestate.rtb4_list.ToArray());

      string newlinestring = string.Format("{0}; {1}; {2}; {3}", rtb1, rtb2, rtb3, rtb4);
      csvdata.AppendLine(newlinestring);

      string filepath = @"C:\new.csv";
      File.WriteAllText(filepath, csvdata.ToString());
    }

然而，当我打开CSV文件，话语是所有的地方。比如我写喜则新行，然后我写了再见。这是actual output，这是我intended output.Hope，我可以得到帮助。

Answer 1

要插入csv文件换行符，你需要将字符串加上双引号，所以由下面的代码生成所需的输出：

public partial class Savestate
{
    public static List<string> rtb1_list = new List<string>() { "hi1", "bye1" };
    public static List<string> rtb2_list = new List<string>() { "hi2", "bye2" };
    public static List<string> rtb3_list = new List<string>() { "hi3", "bye3" };
    public static List<string> rtb4_list = new List<string>() { "hi4", "bye4" };
}
public static void Savetocsv()
{
    Type s = typeof(Savestate);
    FieldInfo[] fields = s.GetFields(BindingFlags.Public | BindingFlags.Static);

    StringBuilder csvdata = new StringBuilder();
    string header = String.Join(",", fields.Select(f => f.Name).ToArray());
    csvdata.AppendLine(header);

    string rtb1 =  String.Join("\n", Savestate.rtb1_list.ToArray());
    string rtb2 =  String.Join("\n", Savestate.rtb2_list.ToArray());
    string rtb3 =  String.Join("\n", Savestate.rtb3_list.ToArray());
    string rtb4 =  String.Join("\n", Savestate.rtb4_list.ToArray());

    string newlinestring = string.Format("\"{0}\",\" {1}\",\" {2}\",\" {3}\"", @rtb1, @rtb2, @rtb3, @rtb4);
    csvdata.AppendLine(newlinestring);

    string filepath = @"new.csv";
    File.WriteAllText(filepath, csvdata.ToString());
}

输出文件：

Answer 2

我建议使用CsvHelper NuGet包与CSV打交道时，再尝试做以下，我添加了一个扩展的方法来打印每个RTB列表作为一个字符串：

public partial class Savestate
{
    public static List<string> rtb1_list = new List<string>() { "hi", "bye" };
    public static List<string> rtb2_list = new List<string>() { "hi", "bye" };
    public static List<string> rtb3_list = new List<string>() { "hi", "bye" };
    public static List<string> rtb4_list = new List<string>() { "hi", "bye" };
}

public static class SavestateExtensions
{
    public static string GetRtbListAsString(this IEnumerable<string> rtb_list)
    {
        StringBuilder str = new StringBuilder();

        foreach (var value in rtb_list)
        {
            str.AppendLine(value);
        }

        return str.ToString();
    }
}

然后使用CsvWriter从CSVHelper：

        using (var writer = new StreamWriter("file.csv"))
        {
            using (var csvWriter = new CsvWriter(writer))
            {
                csvWriter.Configuration.Delimiter = ";";
                csvWriter.Configuration.Encoding = Encoding.UTF8;

                csvWriter.WriteField("rtb1_list ");
                csvWriter.WriteField("rtb2_list ");
                csvWriter.WriteField("rtb3_list ");
                csvWriter.WriteField("rtb4_list ");
                csvWriter.NextRecord();

                csvWriter.WriteField(Savestate.rtb1_list.GetRtbListAsString());
                csvWriter.WriteField(Savestate.rtb2_list.GetRtbListAsString());
                csvWriter.WriteField(Savestate.rtb3_list.GetRtbListAsString());
                csvWriter.WriteField(Savestate.rtb4_list.GetRtbListAsString());
                csvWriter.NextRecord();
            }
        }

输出应为以下几点：