Question

我知道这个问题已经问过很多次了（1，2和3），但我只是不知道如何在我的案例中应用它。我尝试玩了几个小时，但我做对了。

我有List<string>形式的变量，其中每个列表包含的数据之间有换行符/多行数据。然后，我调用了一个事件，该事件会将这些数据导出到CSV文件中。下面是我的代码。

savestate.cs-我在其中初始化变量的类

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，当我打开CSV文件时，单词到处都是。例如，我写了 hi ，然后写了新行，然后写了再见。这是actual output，这是我的intended output。希望可以得到帮助。

Answer 1

要在csv文件中插入换行符，您需要将字符串用双引号引起来，以便通过以下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

我建议在处理CSV时使用CsvHelper Nuget软件包，然后尝试执行以下操作，我添加了扩展方法以将每个rtb列表打印为一个字符串：

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中的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();
            }
        }

输出应如下所示：

将mutiline数据导出到csv中的同一单元格

2 个答案: