DbContext Constructors Reference Feedback Definition Namespace: System.Data.Entity Assembly: EntityFramework.dll Overloads DbContext() Constructs a new context instance using conventions to create the name of the database to which a connection will be made. The by-convention name is the full name...
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] public DbContext(string nameOrConnectionString); Parameters nameOrConn...
The DbContextOptionsBuilder uses the UseSQLServer extension method, which registers the SQL Server database provider to be used with entity framework core. We pass the connection string to the UseSqlServer method Injecting Context via constructor...
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability","CA2000:Dispose objects before losing scope")] [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage","CA2214:DoNotCallOverridableMethodsInConstructors")]publicDbContext(stringnameOrConnectionString); ...
DbContextMissingConstructor(typeof(TContext).ShortDisplayName())); } } 在CheckContextConstructors,我们看到反射去获取DBContext的继承类,查找构造函数,并且参数如果是0就会报异常。接下来在往下走,调用了一个AddCoreServices的方法,在这个方法里,我们是将DBContextOptions的泛型和非泛型注入到容器里面去,其中有一个...
cannot be used for constructor parameter of typeMicrosoft.EntityFrameworkCore.DbContextOptions [DbContextB] 当我将DbContextPool换成DbContext就没有问题了。我尝试过将注入顺序调换,结果是用DbContextPool只会记住最后一个注入的,前边的都是被覆盖掉。请问这是为什么?环境:.Net Core 2.1 RC1...
在CheckContextConstructors,我们看到反射去获取DBContext的继承类,查找构造函数,并且参数如果是0就会报异常。接下来在往下走,调用了一个AddCoreServices的方法,在这个方法里,我们是将DBContextOptions的泛型和非泛型注入到容器里面去,其中有一个CreateDbContextOptions的方法,里面去new了一个DbContextOptionsBuilder类,然后调...
This pattern also makes it easy to pass configuration like the connection string via theDbContextconstructor. For example: C# publicclassApplicationDbContext:DbContext{privatereadonlystring_connectionString;publicApplicationDbContext(stringconnectionString){ _connectionString = connectionString; }protectedoverrid...
This pattern also makes it easy to pass configuration like the connection string via the DbContext constructor. For example:C# نسخ public class ApplicationDbContext : DbContext { private readonly string _connectionString; public ApplicationDbContext(string connectionString) { _connectionString...
();14#endregion1516#regionConstructors17///18///类构造方法19///20staticDbFactory()21{22sysTimer.AutoReset =true;23sysTimer.Enabled =true;24sysTimer.Elapsed +=newSystem.Timers.ElapsedEventHandler(sysTimer_Elapsed);25sysTimer.Start();26}27#endregion2829#regionStatic Methods3031///32///订阅E...