Using AutoMapper to map a string to an enum in C#

Using AutoMapper to map a string to an enum in C#

Automapper is a powerful tool for mapping objects between different classes or types in C#. To map a string value to an enum using Automapper, you can follow these steps:

  • Create a mapping configuration using MapperConfiguration and specify the source and destination types:
var config = new MapperConfiguration(cfg => { cfg.CreateMap<string, MyEnum>(); });

In this example, we're creating a mapping configuration that maps a string value to a MyEnum value.

  • Create an instance of IMapper using the mapping configuration:
var mapper = config.CreateMapper();
  • Use the Map method of the IMapper instance to map the string value to the MyEnum value:
string source = "Value1"; MyEnum destination = mapper.Map<MyEnum>(source);

In this example, we're mapping the source string value "Value1" to the MyEnum value MyEnum.Value1.

  • (Optional) If the string value does not exactly match the enum value names, you can use the ConvertUsing method to provide a custom conversion function:
cfg.CreateMap<string, MyEnum>() .ConvertUsing(source => Enum.Parse(typeof(MyEnum), source.Replace(" ", ""), true));

In this example, we're removing any spaces from the source string value before parsing it as a MyEnum value.

By default, Automapper uses Enum.Parse to convert the string value to an enum value. However, you can customize the conversion behavior using the ConvertUsing method as shown above.

In summary, to map a string value to an enum using Automapper, you need to create a mapping configuration, create an IMapper instance, and use the Map method to perform the mapping. If needed, you can use the ConvertUsing method to provide a custom conversion function.

Examples

  1. "AutoMapper map string to enum in C# example"

    • Description: Learn how to use AutoMapper to map a string to an enum in C# for seamless conversion between different data types.
    • Code:
      CreateMap<string, MyEnum>().ConvertUsing(s => Enum.Parse<MyEnum>(s));

  2. "AutoMapper map string to enum with case-insensitive matching"

    • Description: Explore how to perform case-insensitive matching when mapping a string to an enum using AutoMapper for more flexible mapping.
    • Code:
      CreateMap<string, MyEnum>().ConvertUsing(s => Enum.Parse<MyEnum>(s, true));

  3. "AutoMapper map string to enum with default value"

    • Description: Understand how to handle default values while mapping a string to an enum using AutoMapper, ensuring graceful handling of unexpected input.
    • Code:
      CreateMap<string, MyEnum>().ConvertUsing(s => Enum.TryParse(s, true, out MyEnum result) ? result : MyEnum.DefaultValue);

  4. "AutoMapper map string to nullable enum"

    • Description: Learn how to map a string to a nullable enum using AutoMapper to handle scenarios where the input can be null.
    • Code:
      CreateMap<string, MyEnum?>().ConvertUsing(s => string.IsNullOrEmpty(s) ? (MyEnum?)null : Enum.Parse<MyEnum>(s));

  5. "AutoMapper map string to enum with custom mapping logic"

    • Description: Explore how to implement custom mapping logic when mapping a string to an enum using AutoMapper, allowing for more complex transformations.
    • Code:
      CreateMap<string, MyEnum>().ConvertUsing(s => CustomEnumMappingLogic.MapFromString(s));

  6. "AutoMapper map enum to string bidirectional mapping"

    • Description: Understand how to create bidirectional mapping between an enum and a string using AutoMapper for scenarios where reverse mapping is needed.
    • Code:
      CreateMap<MyEnum, string>().ConvertUsing(e => e.ToString()); CreateMap<string, MyEnum>().ConvertUsing(s => Enum.Parse<MyEnum>(s));

  7. "AutoMapper map string to enum using attribute mapping"

    • Description: Learn how to use attribute mapping with AutoMapper to map a string to an enum in C#, providing a declarative approach for mapping.
    • Code:
      [ValueConverter(typeof(MyEnumConverter))] public enum MyEnum { /* enum values */ } public class MyEnumConverter : IValueConverter<string, MyEnum> { public MyEnum Convert(string sourceMember, ResolutionContext context) { return Enum.Parse<MyEnum>(sourceMember, true); } }

  8. "AutoMapper map string array to enum array"

    • Description: Explore how to map an array of strings to an array of enums using AutoMapper for bulk conversion of data.
    • Code:
      CreateMap<string[], MyEnum[]>().ConvertUsing(strings => strings.Select(s => Enum.Parse<MyEnum>(s)).ToArray());

  9. "AutoMapper map string to enum using custom resolver"

    • Description: Understand how to use a custom resolver when mapping a string to an enum using AutoMapper, providing more control over the mapping process.
    • Code:
      CreateMap<string, MyEnum>().ConvertUsing<CustomEnumResolver>(); public class CustomEnumResolver : IValueResolver<string, MyEnum, MyEnum> { public MyEnum Resolve(string source, MyEnum destination, MyEnum destMember, ResolutionContext context) { return Enum.TryParse(source, true, out MyEnum result) ? result : MyEnum.DefaultValue; } }

  10. "AutoMapper map enum to string with formatted values"

    • Description: Explore how to format enum values as strings using AutoMapper, allowing for customized representations during mapping.
    • Code:
      CreateMap<MyEnum, string>().ConvertUsing(e => e.ToString("G")); CreateMap<string, MyEnum>().ConvertUsing(s => Enum.Parse<MyEnum>(s, true));

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