EF7 beta6：更新時出現ReadAsync錯誤

Question

我正在使用ASP.NET5和Entity Framework 7.0.0-beta 6創建一個API，當我嘗試執行更新時，出現此異常：

mscorlib.dll中發生類型'Microsoft.Data.Entity.DbUpdateException'的異常，但未在用戶代碼中處理。

{“更新條目時發生錯誤。有關詳細信息，請參閱內部異常。”}

當閱讀器關閉時，無效的嘗試調用ReadAsync。

更新操作正確完成，並且更改保存到數據庫中，但是出現此異常。

我的代碼非常簡單，並且在更新操作之后我不嘗試讀取任何內容：

public class CompanyRepository : ICompanyRepository
{

    MrBellhopContext _dbcontext;


    public async Task UpdateAsync(Company company)
    {
        _dbcontext.Update(company);
        await _dbcontext.SaveChangesAsync();
    }
}



[Route("api/[controller]")]
public class CompanyController : Controller
{


    [HttpPut]
    public async void UpdateAsync([FromBody] Company company)
    {
        if ((!ModelState.IsValid) || (company == null))
        {
            Context.Response.StatusCode = 400;
            return;
        }
        else
        {
            await _repository.UpdateAsync(company);
        }
    }

}

這是Stacktrace：

   at Microsoft.Data.Entity.Update.AffectedCountModificationCommandBatch.<ConsumeAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.Data.Entity.Update.ReaderModificationCommandBatch.<ExecuteAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at Microsoft.Data.Entity.Update.BatchExecutor.<ExecuteAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.Data.Entity.ChangeTracking.Internal.StateManager.<SaveChangesAsync>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Microsoft.Data.Entity.DbContext.<SaveChangesAsync>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at MrBellhop.Data.Repositories.Company.CompanyRepository.<UpdateAsync>d__5.MoveNext() in D:\SciOf\MrBellhop\MrBellhop.Data\Repositories\Company\CompanyRepository.cs:line 47
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at MrBellhop.API.Controllers.Company.CompanyController.<UpdateAsync>d__9.MoveNext() in D:\SciOf\MrBellhop\MrBellhop.API\Controllers\Company\CompanyController.cs:line 62

有誰知道如何解決這個問題？

Answer 1

解決了！

我已修改控制器以返回任務：

[Route("api/[controller]")]
public class CompanyController : Controller
{


    [HttpPut]
    public async Task UpdateAsync([FromBody] Company company)
    {
        if ((!ModelState.IsValid) || (company == null))
        {
            Context.Response.StatusCode = 400;
            return;
        }
        else
        {
            await _repository.UpdateAsync(company);
        }
    }

}

+ info： https : //github.com/aspnet/EntityFramework/issues/2786