问将Entity Framework中的字符串列映射到Enum

EN

public virtual string StatusString
{
    get { return Status.ToString(); }
    set { OrderStatus newValue; 
          if (Enum.TryParse(value, out newValue))
          { Status = newValue; }
        }
}

public virtual OrderStatus Status { get; set; } 

    public string OrderStateIdentifier
    {
        get { return OrderState.ToString(); }
        set { OrderState = value.ToEnum<OrderState>(); }
    }

    [NotMapped]
    [JsonIgnore]
    public OrderState OrderState { get; set; }


public static class EnumHelper
{
    /// <summary>
    /// Converts string to enum value (opposite to Enum.ToString()).
    /// </summary>
    /// <typeparam name="T">Type of the enum to convert the string into.</typeparam>
    /// <param name="s">string to convert to enum value.</param>
    public static T ToEnum<T>(this string s) where T: struct
    {
        T newValue;
        return Enum.TryParse(s, out newValue) ? newValue : default(T);
    }
}

[Column(TypeName = "nvarchar(50)")]
public FileTypes FileType { get; set; }

modelBuilder
  .Entity<File>()
  .Property(e => e.FileType)
  .HasConversion(new EnumToStringConverter<FileTypes>());