With the rise of multi-core processors and multi-threading, Asynchronous Programming has become an essential tool for building efficient and responsive C# applications. Fortunately, C# provides a rich library for making Asynchronous calls. However, this complex and advanced topic can be challenging for many developers.
Today we are releasing the final version of Entity Framework Core 2.0, alongside .NET Core 2.0 and ASP.NET Core 2.0.
Entity Framework (EF) Core is the lightweight, extensible, and cross-platform version of Entity Framework, the popular Object/Relational Mapping (O/RM) framework for .NET.
.NotSupportedException: The method 'Max' is not supported
This topic provides information about the way in which LINQ queries are composed and executed when you are using the WCF Data Services client and limitations of using LINQ to query a data service that implements the Open Data Protocol (OData). For more information about composing and executing queries against an OData-based data service, see Querying the Data Service (WCF Data Services). Composing LINQ Queries LINQ enables you to compose queries against a collection of objects that implements IEnumerable. Both the Add Service Reference dialog box in Visual Studio and the DataSvcUtil.exe tool are used to generate a representation of an OData service as an entity container class that inherits from DataServiceContext, as well as objects that represent the entities returned in feeds. These tools also generate properties on the entity container class for the collections that are exposed as feeds by the service. Each of these properties of the class that encapsulates the data service return a DataServiceQuery. Because the DataServiceQuery class implements the IQueryable interface defined by LINQ, the WCF Data Services you can compose a LINQ query against feeds exposed by the data service, which are translated by the client library into a query request URI that is sent to the data service on execution. Note: The set of queries expressible in the LINQ syntax is broader than those enabled in the URI syntax that is used by OData data services. A NotSupportedException is raised when the query cannot be mapped to a URI in the target data service. For more information, see the Unsupported LINQ Methods in this topic.
.NET 7 minimal API from scratch | FULL COURSE | clean architecture, repository pattern, CQRS MediatR
In this course I want to provide you a project structure and code organization to get you started with real .NET 7 minimal API projects. It's a full course on this topic where I start from creating and explaining the project structure, setting up different layers using EF Core, repository pattern, CQRS and MediatR. The biggest part of the video is however around the .NET 7 minimal API, taking you from the initial setup, explaining route handlers, implementing all CRUD operations and so on. Last but not least, this course walks you through the process of refactoring the .NET 7 minimal API so that it becomes readable, maintainable and scalable. At the end, you'll have a full project structure organized according to modern architectural patterns that you can take as a template for your own projects.
Contents
1. Intro: 00:00
2. Structuring the solution: 01:00
3. Coding the domain layer: 05:25
4. Coding the data access layer: 08:22
5. Creating repositories: 11:17
6. Adding migrations and database update: 22:30
7. CQRS with MediatR: 29:07
8. Route and rout handlers: 52:06
9. Dependency injection: 55:52
10. Implementing GET by ID : 57:40
11. Implementing POST route: 01:00:26
12. Implementing GET all route: 01:03:41
13. Implement PUT and DELETE: 01:04:57
14. Testing with Postman: 01:09:01
15. Is there a problem? 01:12:41
16. Refactoring service registrations: 01:15:49
17. Refactoring route registrations: 01:20:01
18. Automatic registration of endpoints: 01:26:28
19. Introducing route groups: 01:31:43
20. Extract lambdas into instance methods: 01:34:31
21: Model validation with endpoint filters: 01:45:58
22. Global exception handling: 01:55:10
23. Conclusions: 01:59:49
| Check | Code | Description |
| Is Null | if(variable is null) return true; |
|
| Is Not Null | if(variable is { }) return false |
|
| Is Not Null | if(variable is object) return false |
|
| Is Null | if(variable == null) return true |
|
| Is Not Null | if(variable != null) return false |
|
what I want is just a smaller jQuery. Enter Umbrella JS by Francisco Presencia , a tiny 8kb (3kb gzipped) alternative with a very familiar, fluent API.
This update is the latest in a cumulative series of feature additions and bug fixes for Visual Studio 2012.
The May release of Visual Studio Code is out, including better IntelliSense, faster step-by-step debugging, and more.
This syntax supports static analysis such that later code will know whether variable is null or not.
Doesn’t produce a warning even when comparing against a non-nullable value type making the code to check pointless.
Requires C# 7.0 because it leverages type pattern matching.