Using Entity Framework Core 6.0.1 The following code should create a Module model with the HelpCard Foreign Key set, then set the Help Card Foreign Key to Null and save the model to the database, but instead the Cascade Delete is being triggered and the record is deleted from the databas...
/// Gets the foreign key to the association type. 32 changes: 6 additions & 26 deletions 32 src/EFCore/Metadata/Internal/EntityType.cs Original file line numberDiff line numberDiff line change @@ -1226,7 +1226,7 @@ public virtual ForeignKey RemoveForeignKey([NotNull] ForeignKey foreignKey...
Unable to create nullable foreign key using efcore, Since EF generated a NOT NULL column for InventoryID you probably have some mapping code that configures it as required. – Gert Arnold Working with Nullable Reference Types The introduction of nullable reference types (NRT) in C# 8 has enable...
I am working on an application where I am using .Net Core 2, EF Core and MySQL as database server via Code First approach. I have 2 tables: User Employee User table is the main table which contains the user information and Employee table is the child table which has a column ...
EF Core is pretty strict about nullable reference types.I wrote about this before in the context of migrations, but it also affects loading of data from the database. If you try to load a null value into a non-nullablestringproperty, aSqlNullValueExceptionwill be thrown: ...
IConventionForeignKey.SetIsOwnership(Nullable<Boolean>, Boolean) 方法 設定值,指出此關聯性是否定義擁有權。 如果true為 ,則一律必須透過主體實體的導覽來存取相依實體。 SetIsOwnership
net core 3.0? Entity Framework version Problem Entity Framework won't delete my entity from the database entity type has no key defined error - help please! Enum and [Display(Name = "")] enum args in controller action methods? Enum Display within View enum to convert int in c# MVC?
Assembly: Microsoft.EntityFrameworkCore.dll Package: Microsoft.EntityFrameworkCore v3.1.0 Configures whether this is a required relationship (i.e. whether none the foreign key properties can be assigned null). C# Copy public Microsoft.EntityFrameworkCore.Metadata.Bu...
Core.EntityException' occurred in EntityFramework.SqlServer.dll but was not handled in user code error : Attaching an entity failed because another entity of the same type already has the same primary key value... Error : One or more validation errors were detected during model generation Error...
File a bug I am using EF Core with PostgreSQL using Npgsql and I have set the Foreign Key of the dependent entity (Chapter, see below) as nullable int. I was expecting when I delete the principle entity (in this case Book) CASCADE NULL w...