Question

我正在使用entityframework和.net core在ABP上创建内容管理系统。使用InsertOrUpdateAsync时出现并发异常。我的表中没有任何数据。

请找到用于创建表格的模型。

   [Table("CMSContents")]
   public class CMSContent:Entity<int>
   {
       public const int MAXTITLELENGHT = 128;

       public const int MAXCONTENTLENGTH = 10000;

       [Key]
       [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
       public override int Id { get; set; }
       /// <summary>
       /// The title of the content.
       /// </summary>
       [Required]
       [StringLength(MAXTITLELENGHT)]
       public virtual string PageName { get;  set; }

       /// <summary>
       /// The Cms Content
       /// </summary>
       public virtual  string PageContent { get; set; }

       protected CMSContent()
       {

       }

       public static CMSContent CreateContent(int id,string title ,string contents)
       {
           var @content = new CMSContent
           {
               Id =  id, 
               PageName = title,
               PageContent = contents
           };

           return @content;
       }
   }
}

以下是用于调用存储库的应用程序服务。

public async Task<CMSContent> InsertOrUpdateCMSContent(CreateContentInput input)
        {
            var @content = CMSContent.CreateContent(input.Id,input.PageName, input.PageContent);
            return await _contentManager.InsertOrUpdateAsync(@content);
        }

从Swagger调用此API时发生异常，

Mvc.ExceptionHandling.AbpExceptionFilter-数据库操作应影响1行，但实际上影响0行。自加载实体以来，数据可能已被修改或删除。有关了解和处理乐观并发异常的信息，请参见http://go.microsoft.com/fwlink/?LinkId=527962。 Abp.Domain.Uow.AbpDbConcurrencyException：数据库操作预期会影响1行，但实际上影响0行。自加载实体以来，数据可能已被修改或删除。有关了解和处理乐观并发异常的信息，请参见http://go.microsoft.com/fwlink/?LinkId=527962。 ---> Microsoft.EntityFrameworkCore.DbUpdateConcurrencyException：数据库操作预期会影响1行，但实际上影响0行。自加载实体以来，数据可能已被修改或删除。有关了解和处理乐观并发异常的信息，请参见http://go.microsoft.com/fwlink/?LinkId=527962。在Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.ThrowAggregateUpdateConcurrencyException（Int32 commandIndex，Int32 ExpectedRowsAffected，Int32 rowsAffected）在Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.ConsumeResultSetWithoutPropagationAsync（Int32 commandIndex，RelationalDataReader阅读器，CancellationToken cancelledToken）在Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.ConsumeAsync（RelationalDataReader阅读器，CancellationToken cancelToken）在Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.ExecuteAsync（IRelationalConnection连接，CancellationToken cancelledToken）在Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync（DbContext _，ValueTuple 2 parameters, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func 4操作，Func 4 verifySucceeded, CancellationToken cancellationToken) at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IReadOnlyList 1个条目要保存，CancellationToken cancelledToken）中在Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync（Boolean acceptAllChangesOnSuccess，CancellationToken cancelToken）在Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync（Boolean acceptAllChangesOnSuccess，CancellationToken cancelToken）在D：\ Github \ aspnetboilerplate \ src \ Abp.EntityFrameworkCore \ EntityFrameworkCore \ AbpDbContext.cs：line 224中的Abp.EntityFrameworkCore.AbpDbContext.SaveChangesAsync（CancellationToken cancelleToken）处 ---内部异常堆栈跟踪的结尾--- 在Abp.EntityFrameworkCore.AbpDbContext.SaveChangesAsync（CancellationToken cancelleToken）在D：\ Github \ aspnetboilerplate \ src \ Abp.EntityFrameworkCore \ EntityFrameworkCore \ AbpDbContext.cs：line 230 在D：\ Github \ aspnetboilerplate \ src \ Abp.ZeroCore.EntityFrameworkCore \ Zero \ EntityFrameworkCore \ AbpZeroCommonDbContext.cs：line 170中的Abp.Zero.EntityFrameworkCore.AbpZeroCommonDbContext`3.SaveChangesAsync（CancellationToken cancelleToken）中在D：\ Github \ aspnetboilerplate \ src \ Abp.EntityFrameworkCore \ EntityFrameworkCore \ Uow \ EfCoreUnitOfWork.cs：line 167中的Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.SaveChangesInDbContextAsync（DbContext dbContext）位于D：\ Github \ aspnetboilerplate \ src \ Abp.EntityFrameworkCore \ EntityFrameworkCore \ Uow \ EfCoreUnitOfWork.cs：Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.SaveChangesAsync（）在D：\ Github \ aspnetboilerplate \ src \ Abp.EntityFrameworkCore \ EntityFrameworkCore \ Uow \ EfCoreUnitOfWork.cs：Abp.EntityFrameworkCore.Uow.EfCoreUnitOfWork.CompleteUowAsync（）在D：\ Github \ aspnetboilerplate \ src \ Abp \ Domain \ Uow \ UnitOfWorkBase.cs：line 273中的Abp.Domain.Uow.UnitOfWorkBase.CompleteAsync（）在Abp.AspNetCore.Mvc.Uow.AbpUowActionFilter.OnActionExecutionAsync（ActionExecutingContext context，ActionExecutionDelegate next）在D：\ Github \ aspnetboilerplate \ src \ Abp.AspNetCore \ AspNetCore \ Mvc \ Uow \ AbpUowActionFilter.cs：line 51 在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync（）在Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow（ActionExecutedContext上下文）处

Answer 1

我尝试了以下方法使其有效，因为评论不允许这么多字符，所以发布它作为答案。

      public async Task<CMSContent> InsertOrUpdateCMSContent(CreateContentInput input)
    {
        var exists = await _contentRepository
            .GetAll()
            .AnyAsync(e => e.Id == input.Id);
        if (!exists)
        {
           var @content = CMSContent.CreateContent(input.PageName, input.PageContent);
            return await _contentRepository.InsertAsync(@content);
        }
        else
        {
            var @content = CMSContent.CreateContent(input.Id, input.PageName, input.PageContent);
            return await _contentRepository.UpdateAsync(@content);
        }            
    }

IRepositoy.InsertOrUpdateAsync引发并发异常

1 个答案: