使用 csvHelper 没有为类型映射任何属性

Question

我有以下class

public class EventObject
{
    public int OrderID { get; private set; }
    public int DemandID { get; private set; }
    public string ExternalEventID { get; private set; }
    public int Part { get; private set; }
    public int BasedOnObjectID { get; private set; }
    public int BasedOnStateID { get; private set; }
    public DateTime StartDate { get; private set; }
    public DateTime EndDate { get; private set; }
    public int? EventID { get; private set; }

    public static IEnumerable<EventObject> LoadFromCSV(TextReader reader)
    {
        var plannedEventsToReturn = new List<EventObject>();
        var csv = new CsvReader(reader);
        csv.Configuration.RegisterClassMap<EventObjectMap >();
        return csv.GetRecords<EventObject>().ToList();
    }
}

并且我创建了一个映射 class，如 csvHElper

中所述

public sealed class EventObjectMap : CsvClassMap<EventObject>
{
    public EventObjectMap ()
    {
        Map(m => m.OrderID).Index(0);
        Map(m => m.DemandID).Index(1);
        Map(m => m.ExternalEventID).Index(2);
        Map(m => m.Part).Index(3);
        Map(m => m.BasedOnObjectID).Index(4);
        Map(m => m.BasedOnStateID).Index(5);
        Map(m => m.StartDate).Index(6).TypeConverter<OptimizationDateTimeConverter>();
        Map(m => m.EndDate).Index(7).TypeConverter<OptimizationDateTimeConverter>();
        Map(m => m.EventID).Index(8).TypeConverter<NullableIntConverter>();
    }
}

当我上线时

return csv.GetRecords<EventObject>().ToList();

我得到一个例外

no properties are mapped for type

Answer 1

发现问题..属性有一个私有集.. 他们需要像这样 public..

public int OrderID { get; set; }
public int DemandID { get; set; }
public string ExternalEventID { get; set; }
public int Part { get;  set; }
public int BasedOnObjectID { get; set; }
public int BasedOnStateID { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndDate { get; set; }
public int? EventID { get; set; }

Answer 2

因此，由于接受的答案工作正常，还有另一种方法可以解决此问题，如下所示

CsvConfiguration configuration = new CsvConfiguration
{
   IgnorePrivateAccessor = true,
}

CsvReader reader = new CsvReader(/*your TextReader*/, configuration);

Documentation

Gets or sets a value indicating if private member should be read from and written to. True to include private member, otherwise false. Default is false.

注意即使您有 internal 属性

也可能会遇到同样的问题

internal int OrderID { get; set; }

对于较新版本的库，似乎属性更名为 IncludePrivateMembers

Answer 3

您现在可以使用 IncludePrivateMembers 属性.

using CsvHelper;
using System.IO;
using System.Linq;
using Xunit;

namespace UseIncludePrivateMembers
{
    public class Stub
    {
        public double Value1 { get; private set; }
        public double Value2 { get; private set; }
    }

    public class Tests
    {
        [Fact]
        public void Test()
        {
            using (var stream = new MemoryStream())
            using (var writer = new StreamWriter(stream))
            using (var reader = new StreamReader(stream))
            using (var csv = new CsvReader(reader))
            {
                writer.WriteLine("Value1,Value2");
                writer.WriteLine("5,6");
                writer.Flush();
                stream.Position = 0;

                csv.Configuration.IncludePrivateMembers = true;
                var record = csv.GetRecords<Stub>().First();

                Assert.Equal(5, record.Value1);
                Assert.Equal(6, record.Value2);
            }
        }
    }
}

Answer 4

还有另一种方法可以解决这个问题：

csv.Configuration.MemberTypes = CsvHelper.Configuration.MemberTypes.Fields;

我的情况可能略有不同，因为我使用的是字段而不是属性，但它是相同的错误消息所以...

使用 csvHelper 没有为类型映射任何属性

getting no properties are mapped for type using csvHelper

csvhelper