在实体框架中基于数据库列值显示枚举文本

Question

I have a model that maps to database table, I have an enum property in that model. I'm storing an int value in the table column and for managing things using enum for that (as I have small fix list).

My question is I want the text of enum for particular db column value.

public class Item
{
    public int ItemId { get; set; } // ItemId (Primary key)

    [Required]
    [DisplayName("Category")]
    public int? CategoryId { get; set; } // CategoryId

    [Required]
    public string Name { get; set; } // Name (length: 100)

    [DisplayName("Item Code")]
    public string ItemCode { get; set; } // ItemCode (length: 15)

    [DisplayName("Unit Type")]
    public int? UnitId { get; set; } // UnitId
    public DateTime? UpdatedOnUtc { get; set; } // UpdatedOnUtc
    public DateTime? CreatedOnUtc { get; set; } // CreatedOnUtc

    [DisplayName("Is Active")]
    public bool IsActive { get; set; } // IsActive

    // Reverse navigation
    public virtual ICollection<GatePass> GatePasses { get; set; }
    public virtual ICollection<MoveOrderItem> MoveOrderItems { get; set; }
    public virtual ICollection<ProjectItemPrice> ProjectItemPrices { get; set; }

    // Foreign keys
    public virtual Category Category { get; set; }

    [NotMapped]
    public Enums.UnitType UnitType { get; set; }
}

I'm storing enum value in UnitId column and for display it value I want to show text of that enum/enum display attribute.

My enum is UnitType :

public enum UnitType
{
    Set = 1,
    Km = 2,
    No = 3,
    Kg = 4,
    Mtr = 5
}

My main purpose is to manage display in EF query because In EF list I will have UnitId but I want to display UnitType's unit text like kg,set,no,mtr etc..

I did this stuff often time in SQL using case when as but I don't know how to manage in EF.

Answer 1

You can change a UnitType property type to string and then read enum constant as below:

public string UnitType 
{ 
   get
   { 
     return Enum.GetName(typeof(UnitType), UnitId); 
   } 
}