將多行數據導出到 csv 中的同一單元格中

Question

我知道這個問題已經被問過很多次（ 1 、 2和3 ），但我只是不明白如何在我的情況下應用它。 我試過玩了幾個小時，但我做對了。

我有List<string>形式的變量，其中每個列表包含在它們/多行數據之間有換行符的數據。 然后我調用了一個事件，將這些數據導出到 CSV 文件中。 下面是我的代碼。

savestate.cs - 我初始化變量的類

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 - 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());
    }

但是，當我打開 CSV 文件時，這些詞到處都是。 例如，我寫了hi然后一個新行然后我寫了bye 。 這是實際輸出，這是我的預期輸出。希望我能得到幫助。

Answer 1

要在csv文件中插入換行符，您需要用雙引號將字符串括起來，因此所需的輸出由以下代碼生成：

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());
}

輸出文件：

Answer 2

我建議在處理 CSV 時使用CsvHelper Nuget 包，然后嘗試執行以下操作，我添加了一個擴展方法將每個 rtb 列表打印為一個字符串：

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從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();
            }
        }

輸出應如下所示：