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Add notes on DbContext Nullability

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Marcello Lamonaca 2021-05-08 11:46:09 +02:00
parent 8bfb001be1
commit cd1fa67960
1 changed files with 9 additions and 10 deletions
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19
.NET/Database/EntityFramework.md
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@ -30,7 +30,8 @@ namespace <Project>.Model
NuGet Packages to install: NuGet Packages to install:
- `Microsoft.EntityFrameworkCore` - `Microsoft.EntityFrameworkCore`
- `Microsoft.EntityFrameworkCore.Tools` to use migrations - `Microsoft.EntityFrameworkCore.Tools` to use migrations in Visual Studio
- `Microsoft.EntityFrameworkCore.Tools.DotNet` to use migrations in `dotnet` cli (`dotnet-ef`)
- `Microsoft.EntityFrameworkCore.Design` *or* `Microsoft.EntityFrameworkCore.<db_provider>.Design` needed for tools to work (bundled w\ tools) - `Microsoft.EntityFrameworkCore.Design` *or* `Microsoft.EntityFrameworkCore.<db_provider>.Design` needed for tools to work (bundled w\ tools)
- `Microsoft.EntityFrameworkCore.<db_provider>` - `Microsoft.EntityFrameworkCore.<db_provider>`
@ -39,15 +40,6 @@ using Microsoft.EntityFrameworkCore;
namespace <Project>.Model namespace <Project>.Model
{ {
class Context : DbContext
{
public Context(DbContextOptions options) : base(options)
{
}
}
// or
class Context : DbContext class Context : DbContext
{ {
private const string _connectionString = "Server=<server_name>;Database=<database>;UID=<user>;Pwd=<password>"; private const string _connectionString = "Server=<server_name>;Database=<database>;UID=<user>;Pwd=<password>";
@ -58,8 +50,15 @@ namespace <Project>.Model
optionsBuilder.UseSqlServer(_connectionString); // specify connection optionsBuilder.UseSqlServer(_connectionString); // specify connection
} }
// or
public Context(DbContextOptions options) : base(options)
{
}
//DBSet<TEntity> represents the collection of all entities in the context (or that can be queried from the database) of a given type //DBSet<TEntity> represents the collection of all entities in the context (or that can be queried from the database) of a given type
public DbSet<Entity> Entities { get; set; } public DbSet<Entity> Entities { get; set; }
public DbSet<Entity> Entities => Set<Entity>(); // with nullable reference types
} }
} }
``` ```