CsvHelper抛出CsvMissingFieldException异常

本文关键字：异常 CsvMissingFieldException 抛出 CsvHelper | 更新日期: 2023-09-27 18:10:01

我一直在尝试解析CSV文件:

NOTE: All directories are updated daily using information from the previous business day.
Company Name,Stock Symbol,DPM,Cycle,Traded at C2,LEAPS 2014,LEAPS 2015,LEAPS 2016,Product Types
(NEW) NEWS CORPORATION CLASS A,NWSA,SIG:MU,1,,,,Y,L,
1ST UNITED BANCORP INC (FL),FUBC,WOLVERINE,3,,,,,
21VIANET GROUP INC.,VNET,CITADEL,3,,,,,
22ND CENTURY GROUP INC.,XXII,CITADEL,1,,,,,
3-D SYSTEMS CORP,DDD,SIG,2,,,,Y,L,W,
3M COMPANY,MMM,SIG:MMM,1,Y,,,Y,L,W,
51JOB INC,JOBS,SIG,1,,,,,
58.COM  INC.,WUBA,CITADEL,1,,,,,
8X8 INC-NEW,EGHT,SIG,2,,,,,
A A R CORP,AIR,CITADEL,2,,,,,
A V HOMES  INC,AVHI,WOLVERINE,3,,,,,
A.M.  CASTLE & CO,CAS,CITADEL,3,,,,,
A10 NETWORKS INC.,ATEN,CITADEL,3,,,,,
AARON''S  INC,AAN,CITADEL,2,,,,,

使用以下代码(我使用子字符串来去掉NOTE部分):

void sciagnijSymbole_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    String dane = e.Result.Substring(91);
    using (TextReader sr = new StringReader(dane))
    {
        var csv = new CsvReader(sr);
        csv.Configuration.RegisterClassMap<SymbolMap>();
        var listaSymboli = csv.GetRecords<Symbol>().ToList();
    }
}
public class Symbol
{
    public String nazwa { get; set; }
    public String symbol { get; set; }
}
public sealed class SymbolMap : CsvClassMap<Symbol>
{
    public SymbolMap()
    {
        Map(m => m.nazwa);
        Map(m => m.symbol);
    }
}

它抛出一个CsvMissingFieldException消息:"字段'nazwa'不存在于CSV文件。"我不知道怎么了。我只希望第一列和第二列写入类，所以我做了一个映射，但它说字段不存在。另外，我从互联网上得到的CSV文件，所以我不想改变它。

CsvHelper抛出CsvMissingFieldException异常

如果您的属性名与csv文件中的列名不匹配，那么您必须在Map中指出列名:

public sealed class SymbolMap : CsvClassMap<Symbol>
{
    public SymbolMap()
    {
        Map(m => m.nazwa).Name("Company Name");
        Map(m => m.symbol).Name("Stock Symbol");
    }
}
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