Question

我正在尝试将数据表的内容发送到带有标头的csv文件。有一个重复的问题，但接受的答案似乎只有一半的工作。在这一点上，我已经混合并匹配得到的赞成，没有运气，需要一个正确的方向。

我可以把列写到文件中，我可以写好数据但不能一起编写。此外，数据永远不会引用，只有逗号分隔，不带引号。

//This is how the FileHelpers class is built
public class ScannedFileInfo
{
    //this prefix will handle the double quotes issue
    //delimiters must reside between double quotes
    //Must specify FieldOrder too
    [FieldQuoted('"', QuoteMode.AlwaysQuoted)]
    [FieldOrder(1)]
    public string DA_Id;
    [FieldQuoted('"', QuoteMode.AlwaysQuoted)]
    [FieldOrder(2)]
    public string Name;
    [FieldQuoted('"', QuoteMode.AlwaysQuoted)]
    [FieldOrder(3)]
    public string Extension;
    [FieldQuoted('"', QuoteMode.AlwaysQuoted)]
    [FieldOrder(4)]
    public string Fullname;
    [FieldQuoted('"', QuoteMode.AlwaysQuoted)]
    [FieldOrder(5)]
    public string PathLength;
    [FieldQuoted('"', QuoteMode.OptionalForBoth)]
    [FieldOrder(6)]
    public string Directory;
}

//this is how I send it to the file
public static void ImportDirectory(string result, SqlConnection myconn, SqlConnection destConn ,ListBox lbInfo, DataGridView dgView)
{
    //create data table code here - works fine...
    MessageBox.Show("Scan complete. Starting Import...");

    //build file 
    var engine = new FileHelperEngine<ScannedFileInfo>();
    var orders = new List<ScannedFileInfo>();
    engine.HeaderText = engine.GetFileHeader();
    engine.WriteFile(@"C:\DirectoryScan.csv", orders);
    MessageBox.Show("You now have proper labeled columns in your file.");

    //now the data import is successful but it overwrites the column info
    CommonEngine.DataTableToCsv(dt, @"C:\DirectoryScan.csv", ',');
    MessageBox.Show("You now have data in your file, but no columns");

}

Answer 1

FileHelpersEngine电话不支持CommonEngine的所有功能。特别是，缺少字段引用和列标题。 FileHelpersEngine<T>的功能不如ScannedFileInfo。

相反，您应该创建一个FileHelpersEngine<ScannedFileInfo>.WriteFile()而不是数据表的列表，然后使用//create list of ScannedFileInfo here var records = new List<ScannedFileInfo>(); records.Add(new ScannedFileInfo() { Name = ..., etc... }); // ( or if you prefer, loop through your datatable to build the list) MessageBox.Show("Scan complete. Starting Import..."); // build file var engine = new FileHelperEngine<ScannedFileInfo>(); engine.HeaderText = engine.GetFileHeader(); engine.WriteFile(@"C:\DirectoryScan.csv", records); MessageBox.Show("You now have data and properly labelled columns in your file.");。

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Answer 2

我不建议您充分研究CSVHelper。这个nuget包让我免于在很多场合拔头发，我无法统计它们。

如果您正在使用它，您可以使用配置设置快速设置标题记录，分隔符，忽略引号或等等。

将数据表的内容发送到带有标头的csv文件

2 个答案: