帶EF核心的TimeStamp/Rowversion列

我想弄清楚我應該如何通過實體框架代碼首先將時間戳/ rowversion列添加到sql服務器中的數據表中。帶EF核心的TimeStamp/Rowversion列

這是使用EF Core V2.0。

我試過兩種方法來實現這個，第一種;

public class Contact 
{ 

    public int ContactId { get; set; } 

    public string ContactName { get; set; } 

    public string CompanyName { get; set; } 

    public string FirstName { get; set; } 

    public string LastName { get; set; } 

    [Timestamp] 
    public byte[] RowVersion { get; set; } 
}

通過流暢API

protected override void OnModelCreating(ModelBuilder modelBuilder) 
    { 
     foreach (var entityType in modelBuilder.Model.GetEntityTypes()) 
     { 
      modelBuilder.Entity(entityType.Name).Property<DateTime>("Inserted"); 
      modelBuilder.Entity(entityType.Name).Property<DateTime>("LastModified"); 
      modelBuilder.Entity(entityType.Name).Property<byte[]>("RowVersion"); 

     } 
    }

第二個在這兩種情況後，我運行Add-遷移，我得到以下;

 protected override void Up(MigrationBuilder migrationBuilder) 
    { 
     migrationBuilder.CreateTable(
      name: "Contacts", 
      columns: table => new 
      { 
       ContactId = table.Column<int>(type: "int", nullable: false) 
        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn), 
       CompanyName = table.Column<string>(type: "nvarchar(max)", nullable: true), 
       ContactName = table.Column<string>(type: "nvarchar(max)", nullable: true), 
       FirstName = table.Column<string>(type: "nvarchar(max)", nullable: true), 
       Inserted = table.Column<DateTime>(type: "datetime2", nullable: false), 
       LastModified = table.Column<DateTime>(type: "datetime2", nullable: false), 
       LastName = table.Column<string>(type: "nvarchar(max)", nullable: true), 
       RowVersion = table.Column<byte[]>(type: "varbinary(max)", nullable: true) 
      }, 
      constraints: table => 
      { 
       table.PrimaryKey("PK_Contacts", x => x.ContactId); 
      }); 
    }

我會期望RowVersion列是類型時間戳，並且其可爲空屬性爲false。這是EF核心的限制還是我試圖做到這一點不正確？

來源

2017-10-18 Dom Sinclair

protected override void OnModelCreating(ModelBuilder modelBuilder) 
{ 
    base.OnModelCreating(modelBuilder); 

    modelBuilder.Entity<MyEntity>() 
     .Property(b => b.MyVersionProperty) 
     .IsRowVersion(); 
}

來源

2017-12-07 20:14:45

帶EF核心的TimeStamp/Rowversion列

回答

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