如何在CsvHelper中使用EnumConverter [英] How to use EnumConverter with CsvHelper

问题描述

我正在使用 CsvHelper 将类序列化为csv文件-直到这里一切正常为止.

I'm using CsvHelper to serialize a class to csv file - until here everything works well.

现在，我正在尝试寻找一种方法来将类的枚举属性转换为csv中的int值，因此以后可以将CSV用于批量插入.

Now I'm trying to find a way to convert the class's enum properties to their int value in the csv, so I could use the CSV for bulk insert later.

我在CsvHelper中找到了EnumConverter类，但是由于所有尝试都失败了，所以我不知道如何正确使用它.

I found out the EnumConverter class in CsvHelper but I can't figure out how to properly use it, as all my tries are failing.

这是我的映射类代码

 public sealed class MyMapping : CsvClassMap<TradingCalendarException>
    {
        public MyMapping()
        {
            EnumConverter enumConverter = new EnumConverter(typeof(CalendarExceptionEntityType));

            Map(m => m.ExceptionEntityType).Index(0).Name("EXCEPTION_ENTITY_TYPE").TypeConverter(enumConverter);
            Map(m => m.ExceptionEntityIdentifier).Index(1).Name("EXCEPTION_ENTITY_IDENTIFIER");
            Map(m => m.OptionType).Index(2).Name("OPTION_TYPE");
            Map(m => m.StartDatetime).Index(3).Name("EXCEPTION_START_DATETIME");
            Map(m => m.EndDatetime).Index(4).Name("EXCEPTION_END_DATETIME");
            Map(m => m.DataSourceType).Index(5).Name("DATA_SOURCE_TYPE");
            Map(m => m.Description).Index(6).Name("DESCRIPTION");
        }
    }

和写作部分

using (StreamWriter file = new StreamWriter(filePath, false, Encoding.UTF8))
        {
            CsvWriter writer = new CsvWriter(file);
            MyMapping mapping = new MyMapping();
            writer.Configuration.RegisterClassMap(mapping);

            writer.WriteRecords(calendarExceptionList);
        }

其余的映射(索引和命名)正常工作，只是EnumConverter并没有做任何更改.

The rest of the mapping (indexing and naming) is working, it's just the EnumConverter that doesn't do any change.

我没有在网上找到任何示例.

I didn't find any examples online.

谢谢！

推荐答案

这是我提出的解决方案:

This is the solution I made:

public class CalendarExceptionEnumConverter<T> : DefaultTypeConverter  where T : struct
    {
        public override string ConvertToString(TypeConverterOptions options, object value)
        {
            T result;
            if(Enum.TryParse<T>(value.ToString(),out result))
            {
                return (Convert.ToInt32(result)).ToString();
            }

            throw new InvalidCastException(String.Format("Invalid value to EnumConverter. Type: {0} Value: {1}",typeof(T),value));
        }
    }

并将其用作以下内容:

Map(m => m.ExceptionEntityType).TypeConverter<CalendarExceptionEnumConverter<CalendarExceptionEntityType>>();

这篇关于如何在CsvHelper中使用EnumConverter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！