k6 is an open-source load testing tool for testing the performance of your systems. It’s built with Go and JavaScript to integrate well into your development workflow, so you can stay on top of performance without fuzz.
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A table can have multiple FILESTREAM columns, but the data from all FILESTREAM columns in a table must be stored in the same FILESTREAM filegroup. If the FILESTREAM_ON clause is not specified, whichever FILESTREAM filegroup is set to be the default will be used. This may not be the desired configuration and could lead to performance problems.
Angular 2.0 will be built using the TypeScript language. It will embrace TypeScript's idioms for working with immersive web experiences in larger applications.
You can get those same benefits by working with TypeScript and Angular together. In this session, you'll learn how Angular and TypeScript work together to create single page applications. You'll see how you can leverage the features of ECMAScript 6, and still support today's browsers. You'll see how adopting TypeScript can be as easy as changing the extensions on your .js files. How you use the TypeScript features is completely in your control.
This release will be shortly followed by R Tools 1.0 for Visual Studio 2017 in early May. RTVS is a free and open source plug-in that turns Visual Studio into a powerful and productive R development environment.
Here are some of the reasons why nullable reference types are less than ideal:
- Invoking a member on a null value will issue a System.NullReferenceException exception, and every invocation that results in a System.NullReferenceException in production code is a bug. Unfortunately, however, with nullable reference types we “fall in” to doing the wrong thing rather than the right thing. The “fall in” action is to invoke a reference type without checking for null.
- There’s an inconsistency between reference types and value types (following the introduction of Nullable<T>) in that value types are nullable when decorated with “?” (for example, int? number); otherwise, they default to non-nullable. In contrast, reference types are nullable by default. This is “normal” to those of us who have been programming in C# for a long time, but if we could do it all over, we’d want the default for reference types to be non-nullable and the addition of a “?” to be an explicit way to allow nulls.
- It’s not possible to run static flow analysis to check all paths regarding whether a value will be null before dereferencing it, or not. Consider, for example, if there were unmanaged code invocations, multi-threading, or null assignment/replacement based on runtime conditions. (Not to mention whether analysis would include checking of all library APIs that are invoked.)
- There’s no reasonable syntax to indicate that a reference type value of null is invalid for a particular declaration.
- There’s no way to decorate parameters to not allow null.
dnSpy is a debugger and .NET assembly editor. You can use it to edit and debug assemblies even if you don't have any source code available.
Some Features
- Debug .NET Framework, .NET Core and Unity game assemblies, no source code required
- Set breakpoints and step into any assembly
- Locals, watch, autos windows
- All metadata can be edited
- Edit methods and classes in C# or Visual Basic with IntelliSense, no source code required
- Add new methods, classes or members in C# or Visual Basic
- IL editor for low level IL method body editing
نکته تکمیلی
در سناریوهای منفصل در زمان حذف یا به روز رسانی یک رکورد، در صورت عدم وجود چنین رکوردی در دیتابیس و بدون توجه به اینکه برای موجودیت مورد نظر ConcurrencyToken یا RowVersion ای تنظیم شده است یا خیر، نیز استثناء DbUpdateConcurrencyException پرتاب خواهد شد.
var student = new Student() {
StudentId = 50
};
using (var context = new SchoolContext()) {
context.Remove<Student>(student);
context.SaveChanges();
} In the above example, a Student with StudentId = 50 does not exist in the database. So, EF Core will throw the following DbUpdateConcurrencyException:Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded.
.NET Conf 2023
.NET Conf 2023 is the largest .NET event hosted online! Co-organized by the .NET community and Microsoft and backed by the support of the .NET Foundation and ecosystem partners, it's your ticket to learning and finding inspiration for your upcoming software projects. Dive into the world of web, mobile, cloud, desktop, gaming, IoT, AI, and beyond, all powered by .NET. Whether you're just starting your coding journey or you're a seasoned pro, these sessions are tailored for everyone. Be prepared for presentations covering the exciting new features of .NET 8, C# 12, Azure, Visual Studio, and so much more. Tune in to learn about the fastest release of .NET yet!
At Microsoft Build 2021 .NET MAUI Preview 4 was launched. This version is already pretty complete and starts to reflect what the end result is going to look like. In this video I will show you the new .NET MAUI template in Visual Studio 2019 and walk you through the Weather 21 demo app.
