I'm using .NET Core Version 7 and I want to use EF Core to access a SQL Server Compact (*.sdf) database file. What libraries to use and how to useScaffold-DbContextto build the existing database models and also the database has a password. I want to use database first m...
if use the default ServiceCollection to AddDbContextPool , it will not throw the exception . I want use the Context pool that read from read-only db node and write to read-write db node so I need two Context pool.. who can tell me how to do this? vagile-cnadded thecustomer-reported...
When EF Core detects an attempt to use a DbContext instance concurrently, you'll see an InvalidOperationException with a message like this:A second operation started on this context before a previous operation completed. This is usually caused by different threads using the same instance of Db...
You can useEF Power Toolsto reverse engineer an existing database instead of writing code manually. 您可以使用 EF Power Tools 对现有数据库进行反向工程,而不是手动编写代码。 Implement the followingDbContextdescendant. 实现以下 DbContext 后代。 usingSystem.Data.Entity;//...publicclassMyDbContext :...
这里和以前的EF保持一致,自定义我们的DbContext, 这里和以往的code first没有差别。 public class AppConfigDbContext : DbContext { public AppConfigDbContext(DbContextOptions options) : base(options) { //create database if no exsisted one this.Database.EnsureCreated(); ...
and another one called UserStore for the IUserStore interface. This makes it very straightforward for developers to know which data is stored and how it is stored. Finally there is an ApplicationDbContext class for the developers to setup a connection string to indicate the databa...
Now the strange part: when I useAddDbContextPoolinstead ofAddPooledDbContextFactoryin my application everything works flawlessly ... but withAddDbContextPoolI cannot attach state toMyDbContext. I think it has something to do with the scoped lease stuff, somehow this works differently when usin...
The DTO is used to define the table within the SQL database. To create the database entry, add a DbSet<> property to the DbContext you are using:C# Copy public class MobileServiceContext : DbContext { private const string connectionStringName = "Name=MS_TableConnectionStri...
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In EF Core, the DbContext has a virtual method called onConfiguring which will get called internally by EF Core, and it will also pass in an optionsBuilder instance, and you can use that optionsBuilder to configure options for the DbContext....