最后我找到了解决方案。我实现了自己的PersistKeysToDbContext版本。现在“TicketDataFormat”的代码（在...
So all you have to do is replace the default assemblies with these new assemblies and, in your data services, specify DataServiceProtocolVersion as V3 rather than V2. Here’s an example of what a simple data service might look like exposing a context (PersonModelContext)...
我正在使用SQL数据库构建一个应用程序,使用以下CRUD操作: public Foo Add(Foo foo) { _dbContext.Foos.Add(foo); _dbContext.SaveChanges(); return foo; } public Foo Delete(int id) { Foo foo = _dbContext.Foos.Find(id); if(foo != null) { _dbContext.Foos.Remove(foo); _dbContext.SaveChang...
The options to be used by a DbContext. You normally override OnConfiguring(DbContextOptionsBuilder) or use a DbContextOptionsBuilder to create instances of this class and it is not designed to be directly constructed in your application code.
Here is my Code: public class GetGlobalCovidData { public AppDbContext _context { get; set; } public GetGlobalCovidData(AppDbContext context) { _context = context; } //Empty Constructor to instantiate class in TimedHostedServices public GetGlobalCovidData() { } public async Task GetData(...
// Do our best here to dispose as much as we can even if we get errors along the way. // Now is not the time to throw. Correctly implemented applications will have called // either Commit() or Rollback() first and would have got the error there. if (!_completed) { try { if ...
在多个方法中使用相同的DbContext是一种常见的做法,它可以提高代码的可维护性和性能。DbContext是Entity Framework中的一个关键组件,用于管理数据库连接和执行数据库操作。 ...
Entity isNOT removedfrom dependent maps, which seems somewhat due to the TryCreateFromCurrentValues(entry, out var key) in DependentMap.Remove returning false (due to the Id property having been flagged as null). So the entry stays in the internal cache in stead of being removed on Detach. ...
I've been working on switching a ASP.NET Core Web API from using .NET 6 to .NET 8. This project is database first and uses Entity Framework (6 and 8 respectively) to scaffold the DBContext and models into the API. I have tried several di...
"Object reference not set to an instance of an object." ??? "PostAsJsonAsync" is not invoking web api POST action method "System.Data.Entity.Internal.AppConfig" type initializer causes an exception "The given key was not present in the dictionary." when passing null non-Route paramater ...