我必须在我们的框架中管理并发,但我无法生成 DbUpdateConcurrencyException。我们使用 SQL Server 2008、EF 6 和 AutoMapper 5。
SQL
ALTER TABLE [Keyword].[Keyword] ADD Rowversion [Rowversion] NOT NULL
模型
[Table("Keyword", Schema = "Mailing")]
public class KeywordModel : _Auditable
{
[Key]
public int KeywordId { get; set; }
public string Name { get; set; }
public string Hashtag { get; set; }
public string Namespaces { get; set; }
public string Html { get; set; }
[Timestamp]
[ConcurrencyCheck]
public virtual byte[] RowVersion { get; set; }
}
视图模型
public class KeywordEditViewModel
{
[HiddenInput(DisplayValue = false)]
public int KeywordId { get; set; }
[Display(Name = "Name")]
public string Name { get; set; }
[Display(Name = "Hashtag")]
public string Hashtag { get; set; }
[Display(Name = "Namespaces")]
[Description("Separate namespaces by ','")]
public string Namespaces { get; set; }
[Required]
[AllowHtml]
[UIHint("MultilineText")]
[Display(Name = "Html")]
[Description("Prefix or sufix your razor variables with #")]
public string Html { get; set; }
[Timestamp]
[ConcurrencyCheck]
public byte[] RowVersion { get; set; }
}
控制器
[HttpPost]
public virtual ActionResult Edit(KeywordEditViewModel model, string @return)
{
var data = new JsonResultData(ModelState);
if (ModelState.IsValid)
{
data.RunWithTry((resultData) =>
{
KeywordManager.Update(model.KeywordId, model, CurrentUser.UserId);
resultData.RedirectUrl = !string.IsNullOrEmpty(@return) ? @return : Url.Action("Index");
});
}
return Json(data);
}
商业
public KeywordModel Update(int id, object viewmodel, int userId)
{
var model = Get(id);
Mapper.Map(viewmodel, model);
SaveChanges("Update mailing keyword", userId);
return model;
}
自动映射器
CreateMap<KeywordModel, KeywordEditViewModel>();
CreateMap<KeywordEditViewModel, KeywordModel>();
在我的测试中,RowVersion 字段在数据库中具有不同的值,但 SaveChange 不会生成异常 DbUpdateConcurrencyException。
SQL 跟踪
UPDATE [Mailing].[Keyword]
SET [Namespaces] = @0, [audit_LastUpdate] = @1
WHERE (([KeywordId] = @2) AND ([RowVersion] = @3))
SELECT [RowVersion]
FROM [Mailing].[Keyword]
WHERE @@ROWCOUNT > 0 AND [KeywordId] = @2
@0: 'titi' (Type = String, Size = -1)
@1: '09/11/2016 13:35:54' (Type = DateTime2)
@2: '1' (Type = Int32)
@3: 'System.Byte[]' (Type = Binary, Size = 8)