اشتراکها
اشتراکها
مشاهده EntityValidationErrors
ارتقاء به EF Core 3.0
Query types که کمی بالاتر معرفی شد، در EF Core 3.0 منسوخ شده اعلام و با همان DbSet ادغام میشود (هدف آن کاهش سردرگمی بین DbQuery و DbSet است). در اینجا query type چیزی بجز یک entity بدون کلید نیست. بنابراین بجای تعریف ModelBuilder.Query، تنها از متد HasNoKey استفاده کنید؛ مانند ()ModelBuilder.Entity<>().HasNoKey. از این پس بجای DbQuery، از همان DbSet استفاده کنید. معادل DbContext.Query نیز DbContext.Set است.
اشتراکها
Visual Studio 2017 15.7 منتشر شد
- We added support to change installation locations.
- You can Save All your pending changes before you start your update.
- The update dialog provides you even more details about your update during installation.
- C# 7.3 is included in Visual Studio version 15.7.
- We improved solution load time for C# and VB projects.
- We made numerous updates to F# and its tools, with a focus on performance.
- We reduced the time to enable IntelliSense for large .NET Core projects by 25%.
- We made Quick Info improvements and new .NET refactorings like convert
for
-to-foreach
and make private fieldsreadonly
. - We added the ability to publish ASP.NET Core applications to App Service Linux without containers.
- Live Unit Testing works with embedded pdbs and supports projects that use reference assemblies.
- The Test Explorer has more responsive icons during test runs.
- C++ developers can use CodeLens for unit testing.
- We added new rules enforcing items from the C++ Core Guidelines.
- Debugging large solutions with /Debug:fastlink PDBs is more robust.
- CMake integration supports CMake 3.11 and static analysis.
- Python projects support type hints in IntelliSense, and a Run MyPy command has been added to look for typing errors in your code.
- Conda environments are supported in Python projects.
- We added a next version of our Python debugger based on the popular open source pydevd debugger.
- TypeScript 2.8 is included in Visual Studio version 15.7.
- We improved Kestrel HTTPs support during debugging.
- We added support for JavaScript debugging with Microsoft Edge.
- The Debugger supports VSTS and GitHub Authentication for Source Link.
- IntelliTrace’s step-back debugging feature is supported for debugging .NET Core projects.
- We added IntelliTrace support for taking snapshots on exceptions.
- We removed the blocking modal dialog from branch checkouts in Git when a solution or project reload is not required.
- There is an option to choose between OpenSSL and SChannel in Git.
- You can create and associate Azure Key Vaults from within the Visual Studio IDE.
- Visual Studio Tools for Xamarin can automatically install missing Android API levels required by Xamarin.Android projects.
- The Xamarin.Forms XAML editor provides IntelliSense and quick fixes for conditional XAML.
- We added support for Azure, UWP, and additional project types in Visual Studio Build Tools.
- You can create build servers without installing all of Visual Studio.
- The Windows 10 April 2018 Update SDK - Build 17134 is the default required SDK for the Universal Windows Platform development workload.
- We added support for Visual State Management for all UWP apps and more.
- We enabled automatic updates for sideloaded APPX packages.
- You have new tools for migrating to NuGet PackageReference.
- We added support for NuGet package signatures.
- We added Service Fabric Tooling for the 6.2 Service Fabric release.
- We updated Entity Framework Tools to work with the EF 6.2 runtime and to improve reverse engineering of existing databases.
نظرات مطالب
EF Code First #1
البته این مطلب اول هست. در مطالب بعدی در مورد «اعتبارسنجی» بیشتر بحث شده:
تمام اینها در مسیر آموزشی EF Code first به ترتیب لیست شدهاند؛ قسمتهای «اعتبارسنجی و بررسی استثناءها» و «ردیابی تغییرات».
- Entity Framework و InnerException
- استثناهایی که باید حین استفاده از EF Code first بررسی شوند
- اعتبارسنجی در Entity framework Code first
تمام اینها در مسیر آموزشی EF Code first به ترتیب لیست شدهاند؛ قسمتهای «اعتبارسنجی و بررسی استثناءها» و «ردیابی تغییرات».
ASP.NET Core applications can be tested with different testing
frameworks and Entity Framework Core makes testing specially easy by
removing different technical problems from our way by using in-memory
data provider. This blog posts shows how to unit test controllers that
use data from Entity Framework Core.
نظرات مطالب
EF Code First #7
- علت به Optional و Required بودن روابط بر میگردد. حالت Required یعنی فرزند، بدون والد نمیتواند وجود داشته باشد؛ برعکس حالت optional. بنابراین فقط در حالت Required حذف فرزندان در صورت حذف والد صورت خواهد گرفت.
- جزئیات بیشتر از زبان طراحان EF:
Deleting orphans with Entity Framework
+ طراحی پیش فرض است؛ مطابق مستندات MSDN:
- جزئیات بیشتر از زبان طراحان EF:
Deleting orphans with Entity Framework
+ طراحی پیش فرض است؛ مطابق مستندات MSDN:
If a foreign key on the dependent entity is nullable, Code First does not set cascade delete on the relationship, and when the principal is deleted the foreign key will be set to null.