Oleg Kyrylchuk ✙ 🇺🇦
@okyrylchuk
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I write about @dotnet | Microsoft MVP | .NET Foundation member | .NET Enthusiast Help for Ukraine or
Joined July 2009
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Pinned Tweet
📢 Exciting News: Introducing the New .NET Pulse Website! 🚀
It's not only a new look.
You can now read, comment, and share my previously sent issues.
There are five latest posts, but I'll add them all in the following days.
Check it out:
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I'm a Ukrainian living in Poland for 12 years. But many of my relatives and friends are in Ukraine.
I see how many people try to justify russia's aggression. If you do it for ANY reason, unfollow me.
I wish you never call your parents and discuss what to do because of war.
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There is a new hot topic in .NET!!
What's your favorite version of code? 😏
I like v3 😬
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.NET 6 introduces two long-awaited types - DateOnly and TimeOnly.
They represent the date or time portion of a DateTime.
Have you been waiting for them? 🤓
#dotnet6
#coding
#devcommunity
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All my tweets about C# 10 features in one thread. 🧵
Retweets are appreciated 😊
#dotnet
#csharp
#coding
#devcommunity
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.NET 6 introduces the new Enumerable.*By methods. A 'keySelector' is provided to compare elements by.
New methods:
• MinBy
• MaxBy
• DistinctBy
• ExceptBy
• IntersectBy
• UnionBy
IMHO, these new methods are super helpful 🤌
#dotnet6
#coding
#devcommunity
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In .NET 6, Parallel.ForEachAsync has been finally added 🥳
It allows you to control the degree of parallelism for scheduled asynchronous work.
#dotnet6
#coding
#devcommunity
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C# 11 introduces a new `required` modifier to properties and fields to enforce constructors and callers to initialize those values.
A new `SetsRequiredMembers` attribute on the constructor informs the compiler that it initializes all required members.
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Nice small improvement for ArgumentNullException in .NET 6.
No need to check for null in every method before throwing an exception.
Now it is a one-liner. 🙌
#dotnet6
#coding
#devcommunity
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Find vs FirstOrDefault.
When you use List<T>, you should use the Find method instead of the FirstOrDefault.
The Find method is generally faster than FirstOrDefault because Find is specifically designed for List<T> and optimized for this collection type.
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A big thread of new APIs in the .NET 6. 🧵
Retweets are appreciated ☺️
#dotnet6
#coding
#devcommunity
#programming
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Meet a new data structure in .NET 6 🙌
PriorityQueue represents a min priority queue.
Each element is enqueued with an associated priority that determines the dequeue order.
The elements with the lowest priority get dequeued first.
#dotnet6
#coding
#devcommunity
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In .NET 6, you can override the default value for '*OrDefault' LINQ methods if no element is found.
Improved methods:
• SingleOrDefault
• FirstOrDefault
• LastOrDefault
A pretty handy feature, isn't it? 🙂
#dotnet6
#coding
#devcommunity
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It was impossible to set a more specific return type in method override in a derived class in C#.
C# 9 makes it possible with covariant returns.
#csharp
#dotnet
#csharp9
#dotnetcore
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A thread about LINQ improvements in .NET 6 🧵
As always, retweets are appreciated 😌
#dotnet6
#linq
#coding
#devcommunity
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EF Core 6.0 new features. 48 code samples.
The biggest thread of mine so far. With sub-threads. The last this year.
It took me almost two months to go through many new features in EF Core 6.
Retweets are appreciated 😊
#dotnet6
#efcore6
#coding
#devcommunity
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Hi folks!
I've published a lot of my latest code samples from my tweets about .NET 6 on GitHub.
You can find samples for:
• C# 10 features
• LINQ features
• System.Text.Json features
• New APIs
#dotnet6
#csharp10
#json
#linq
#devcommunity
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A thread of System.Text.Json features in the .NET 6. 🧵
Retweets are appreciated ☺️
#dotnet6
#coding
#devcommunity
#json
#programming
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If you need to split elements of a sequence into chunks, you don't have to implement it on your own anymore in .NET 6.
Meet a new IEnumerable extension method, 'Chunk' 🙌
#dotnet6
#coding
#devcommunity
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Please, go out on protests in your cities! Demand from your governments to help Ukraine!
Ukraine is strong, but we need help!
#UkraineUnderAttack
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EF 7 introduces a bulk update and deletion.
Restrictions:
• EF doesn't track bulk changes.
• Any tracked entities will not be kept in sync.
• Additional commands may need to be sent in the correct order so as not to violate database constraints.
Finally 🎉
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C# 11 introduces a new access modifier 𝗳𝗶𝗹𝗲.
The visibility of created type is scoped to the source file in which it is declared.
This feature helps source generator authors avoid naming collisions.
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Redis for .NET Developers!
A complete Redis development course for the .NET programmer.
Starts today.
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.NET 6 introduces a new low-level API for reading and writing files without a FileStream.
A new type, RandomAccess, provides offset-based APIs for reading and writing files in a thread-safe manner.
#dotnet6
#coding
#devcommunity
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.NET 6 introduces a new fully async 'PeriodicTimer'.
It's enables waiting asynchronously for timer ticks.
It has one method, 'WaitForNextTickAsync', which waits for the next tick of the timer or for the timer to be stopped.
#dotnet6
#coding
#devcommunity
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In C#, if you want to pass the type to an attribute, you can use the 'typeof' expression.
However, there is no way to constrain what types are allowed to be passed.
C# 10 allows generic attributes🙂
The feature is still in preview.
#dotnet
#coding
#devcommunity
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C# 11 preview introduces raw string literals.
It allows containing of arbitrary text without escaping.
The format is at least three double quotes """.."""
Combining with string interpolation, the count of $ denotes how many consecutive braces start and end the interpolation.
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The 'Range' struct has been introduced in the .NET Core 3.0. It is used by the C# compiler to support a range operator '..'
In .NET 6, the 'Take' method from IEnumerable<T> supports the 'Range'.
Now you can skip the 'Skip' method 😉
#dotnet6
#coding
#devcommunity
#linq
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.NET 7 introduces new structs Int128 and UInt128.
They represent 128 signed and 128 unsigned integers respectively.
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Since .NET 5, Core has built-in support for the Swashbuckle project (Swagger).
Core 9 removes Swashbuckle from the template as the project is not actively maintained.
The .NET team added support for OpenAPI document generation.
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.NET Core 3.0 has introduced the 'Index' struct, which is used by the C# compiler to support a new unary prefix "hat" operator (^).
It means index "from the end" of collection.
In .NET 6, 'ElementAt' method from IEnumerable<T> supports the Index.
#dotnet6
#coding
#devcommunity
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All my tweets about C# 11 features in one thread 🧵
Twelve features!
Which one is your favorite? I'm waiting for the required members 🔥
Retweets are appreciated 😊
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I've converted another of my Twitter threads to a blog article.
LINQ improvements in .NET 6
#dotnet6
#linq
#devcommunity
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In .NET 6, you can enable validation of NuGet packages.
It validates if:
• there are no breaking changes across versions
• the package has the same set of public APIs for all runtime-specific implementations
It also determines any target-framework gaps
#dotnet6
#devcommunity
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C# 12 introduces collection expressions.
It's a new terse syntax to initialize collections.
It works with arrays, Span<T>, and types that support collection initializers.
A new spread operator .. allows inlining other collections into a collection expression.
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.NET 9 significantly improves exception handling performance.
The previous structured exception handling on Windows (SEH) and its emulation on Unix were removed.
The new implementation is based on the NativeAOT runtime's exception-handling model.
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.NET 6 has an implementation of the OpenTelemetry Metrics API specification.
A 'Meter' class creates instrument objects.
There are instrument classes:
• Counter
• Histogram
• ObservableCounter
• ObservableGauge
You can even listen to the meter.
#dotnet6
#devcommunity
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.NET 6 includes preview support for HTTP/3 (not Web3).
HTTP/3 uses a new connection protocol QUIC.
/1
#dotnet6
#devcommunity
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EF Core 6.0 gets its own minimal APIs.
New extension methods register a DbContext type and supply a database provider's configuration in a single line.
#dotnet6
#efcore6
#coding
#devcommunity
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.NET 6 SDK introduces a new command.
dotnet sdk check
It shows you if there is a new version available for any of the .NET SDKs, runtimes, or workloads you have installed.
#dotnet6
#coding
#devcommunity
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C# 11 introduces static abstract members in interfaces.
You can add static abstract members in interfaces to define interfaces that include overloadable operators, other static members, and static properties.
It's one of the features to enable generic math support.
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In .NET 6, System.Text.Json exposes notifications for (de)serialization.
There are four new interfaces to implement according to your needs:
• IJsonOnDeserialized
• IJsonOnDeserializing
• IJsonOnSerialized
• IJsonOnSerializing
#dotnet6
#json
#coding
#devcommunity
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EF Core supports querying via stored procedures.
EF 7 introduces support for mappings for 𝗶𝗻𝘀𝗲𝗿𝘁𝘀, 𝘂𝗽𝗱𝗮𝘁𝗲𝘀, and 𝗱𝗲𝗹𝗲𝘁𝗲𝘀 to SP.
An example below shows how to map insert SP for a 𝗧𝗮𝗴 entity type.
Insert of 𝗧𝗮𝗴 will execute 𝗧𝗮𝗴𝘀_𝗜𝗻𝘀𝗲𝗿𝘁 SP.
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In .NET 5 new HttpClient extension methods have been added.
Now you can easily GET data from JSON and POST data as JSON.
HttpContent also got new extension methods to read and then parse from JSON.
#dotnet
#programming
#DEVCommunity
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.NET 9 in the preview introduces the Task.WhenEach method.
It allows to join scheduled tasks and iterate through them as each of them is completed.
Previously, you had to repeatedly use Task.WaitAny on a set of tasks to pick off the next one that completes.
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.NET 6 introduces implicit namespace support for C# projects.
Namespaces are implicitly included by utilizing the 'global using' feature introduced in C# 10.
Since RC1 the option is enabled by default.
#dotnet
#coding
#devcommunity
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LINQ query enhancements in EF Core 6.0 thread.
12 features with code samples.
Retweets are appreciated 😊
#dotnet6
#efcore6
#coding
#devcommunity
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.NET 7 introduces new type converters for the newly added primitive types as:
• DateOnly
• TimeOnly
• Half
• Int128
• UInt128
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𝗘𝗙 7 introduces entity splitting.
It maps a single entity type to multiple tables.
The example below shows how a single 𝗣𝗲𝗿𝘀𝗼𝗻 entity maps to three separate tables - 𝗣𝗲𝗼𝗽𝗹𝗲, 𝗣𝗵𝗼𝗻𝗲𝗡𝘂𝗺𝗯𝗲𝗿𝘀, and 𝗔𝗱𝗱𝗿𝗲𝘀𝘀𝗲𝘀.
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.NET 9 introduces a new Base64Url type.
The existing Convert.ToBase64String method can produce a string with '/', '+', or '=' characters. They are not safe for URLs because they have special meanings in URLs.
The Base64Url helper produces the string without these characters.
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Today is the end of support for .NET 7.
Have you been able to upgrade to .NET 8 yet?
Goodbye, .NET 7 🤝
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In .NET 6, you can easier wait for the task to complete execution asynchronously.
The 'TimeoutException' is thrown when the timeout of operation expires.
⚠️ This is for un-cancellable operations!
#dotnet6
#coding
#devcommunity
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In .NET, there are LINQ methods 𝘖𝘳𝘥𝘦𝘳𝘉𝘺 and 𝘖𝘳𝘥𝘦𝘳𝘉𝘺𝘋𝘦𝘴𝘤𝘦𝘯𝘥𝘪𝘯𝘨 to sort sequence elements according to a key.
.NET 7 introduces new methods 𝘖𝘳𝘥𝘦𝘳 and 𝘖𝘳𝘥𝘦𝘳𝘋𝘦𝘴𝘤𝘦𝘯𝘥𝘪𝘯𝘨 to sort sequence elements using the default comparer.
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EF 7 introduces a new 𝗜𝗠𝗮𝘁𝗲𝗿𝗶𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻𝗜𝗻𝘁𝗲𝗿𝗰𝗲𝗽𝘁𝗼𝗿 that intercepts object creation and initialization by EF, typically when data is returned by a query.
In the example below, the interceptor sets the time when an entity is retrieved from the database.
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My first blog post this year! 🥳
Seven System.Text.Json features in the .NET 6.
#dotnet6
#json
#devcommunity
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I'm on Scott's blog. Now I can retire 😀
Thank you,
@shanselman
, for recommendation to follow me 💚
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C# 11 preview introduces list patterns.
It extends pattern matching to match sequences of elements in an array or a list.
You can use list patterns with any pattern, including constant, type, property, and relational patterns.
Bonus example in the reply 👇
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GitHub Copilot is now available from Visual Studio 2022 for everyone in the technical preview.
I got access to Copilot for VS Code several months ago. I didn't play too much with it, but I was impressed with what it could do.
I'm curious how it'll work in Visual Studio.
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New .NET is a cross-platform. You can run your app across different platforms.
However, using platform-specific APIs means you have to be careful with it.
There are new APIs and platform compatibility analyzer to deal with cross-platform issues.
🧵 1/6
#dotnet
#devcommunity
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.NET 6 introduced a new fully async PeriodicTimer.
It enables waiting asynchronously for timer ticks.
It has one method, WaitForNextTickAsync, which waits for the next tick of the timer or for the timer to be stopped.
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I've been awarded Microsoft MVP in Developer Technologies.
I'm grateful, but I can't rejoice it due the war in Ukraine with russia.
I suspended my community work since Feb 24th. I hope I'll be able to be back soon when Ukraine wins.
Stay safe and support Ukraine 🇺🇦
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System.Text.Json 9 in preview introduces a new type, JsonSchemaExporter.
It allows generating a JSON schema that represents a .NET type.
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Entity Framework Core 5.0 introduces new entity mappings.
You can map an entity to:
• a SQL query
• a table-valued function
• a view
Example below.
#dotnet
#EFCore
#EntityFramework
#coding
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C# 11 preview introduces newlines in string interpolation.
It allows any valid C# code between { }, including newlines, to improve readability.
It's helpful when you want to use longer C# expressions in interpolation, like pattern matching switch expressions or LINQ queries.
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Starting with EF Core 2.2, you could add a tag to your query for better debug purposes.
EF Core 6.0 went further, and now you can tag queries with the filename and line number of the LINQ code.
Pretty cool, huh? 😎
#dotnet6
#efcore6
#coding
#devcommunity
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.NET 6 introduces a new API to allocate native memory.
A new NativeMemory type has methods for allocation and freeing memory.
What do you think about the feature? 🧐
#dotnet6
#coding
#devcommunity
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.NET 8 introduces a new TimeProvider abstraction.
It allows time mocking in the test scenarios.
It is supported by other features that rely on time, for example, Task.Delay.
Also, a netstandard 2.0 library Microsoft.Bcl.TimeProvider has been created with this provider.
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Starting from C# 10, you can reference nested properties or fields within a proper pattern.
The property pattern becomes more readable and requires fewer curly brackets 🙂
What do you think about the feature?
#dotnet
#coding
#devcommunity
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With .NET 6, you can now search NuGet .org for new templates.
dotnet new --search
For installed templates, you can check updates via --update-check and apply them via --update--apply.
#dotnet6
#cli
#devcommunity
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EF Core 6.0 supports SQL Server temporal tables.
A table can be configured as a temporal table with the SQL Server defaults for the timestamps and history table.
1/2 👇
#dotnet6
#efcore6
#coding
#devcommunity
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Another small improvement in .NET 6.
You can access a process path without allocation a new Process instance.
#dotnet6
#coding
#devcommunity
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.NET 6 introduced a new low-level API for reading and writing files without a FileStream.
A new type, RandomAccess, provides offset-based APIs for reading and writing files in a thread-safe manner.
4
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By default, EF Core maps aggregate types to the same table as the owning entity type. Each property is mapped to a column.
Also, you can map aggregate to its own table.
In EF 7, you can map aggregate to a JSON column.
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.NET 6 introduced a new data structure.
PriorityQueue implements an array-backed, quaternary min-heap.
Each element is enqueued with an associated priority that determines the dequeue order.
The elements with the lowest priority get dequeued first.
7
24
180
EF Core supports splitting a single LINQ query into multiple SQL queries.
EF Core 6.0 can split a LINQ query where non-navigation collections are contained in the query projection.
#dotnet6
#efcore6
#coding
#devcommunity
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Last year I tweeted about generic attributes, which were supposed to be in C# 10.
However, the release was postponed to C# 11.
So I enhanced my old graphic 🙂
C# 11 introduces the generic attributes.
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.NET 9 preview introduces the new LINQ method Index.
It returns the implicit index with an enumerated item.
Do you like it?
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C# 12 introduces the using directives for additional types.
You can now alias almost any type.
It's beneficial for tuples because you can name tuple elements.
11
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The C# 13 preview introduces a new Lock object for better thread synchronization through its API.
For example, the EnterScope method enters an exclusive scope and returns the struct with the Dispose method, which supports the Dispose pattern.
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Recently I've booked a slot in .NET Advent Calendar. The problem is I didn't have a blog 😬
So I've created one powered by
@hashnode
✍️
I am thrilled to announce my first blog post about new APIs in .NET 6🥳
#dotnet6
#devcommunity
#hashnode
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C# 10 introduces a new way of namespace declarations - file scoped namespaces.
However, you cannot declare a nested namespace or a second file-scoped namespace in the same file.
C# continue to rid of curly brackets {😀}
#dotnet
#programming
#devcommunity
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You're offered $1 million, but you can never use .NET again. Do you accept?
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System.Text.Json 9 introduces a new JsonStringEnumMemberName attribute.
It allows customizing enum member names.
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Are you annoyed when you open many files in Visual Studio, and they disappear at the end of the screen?
You don't know how many files you opened and don't see them?
It's fixed! In the newest Visual Studio 17.3, you can show tabs in multiple rows!
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A new ConfigureHostOptions API on IHostBuilder has been added in .NET 6.
It makes the application setup simpler.
#dotnet6
#coding
#devcommunity
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Anonymous functions are not cheap.
Lambda can unintentionally capture local variables, resulting in unexpected additional allocations.
The static modifier on lambdas since C# 9 helps to avoid it.
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.NET 6 introduces new helpers for working with powers of 2.
'IsPow2' evaluates whether the specified value is a power of two.
'RoundUpToPowerOf2' rounds the specified value up to a power of two.
#dotnet6
#coding
#devcommunity
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.NET 6 introduces a new CreateAsyncScope method for creating AsyncServiceScope.
The existing CreateScope method throws an exception when you dispose of an IAsyncDisposable service.
The CreateAsyncScope provides a straightforward solution.
#dotnet6
#coding
#devcommunity
0
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.NET 6 introduces source generators for System.Text.Json.
(De)serialization is based on runtime reflection, which is not the best for high-performance scenarios.
A compile-time source generation is an alternative for such scenarios.
#dotnet6
#json
#coding
#devcommunity
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C# 10 introduces a new caller expression attribute.
It allows capturing an expression passed for a parameter as a string.
Like other CompilerServices attributes, it is applied to an optional parameter.
#dotnet6
#csharp10
#coding
#devcommunity
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.𝐍𝐄𝐓 𝟖 introduces the frozen collections.
Two helper methods, 𝐓𝐨𝐅𝐫𝐨𝐳𝐞𝐧𝐃𝐢𝐜𝐭𝐢𝐨𝐧𝐚𝐫𝐲 and 𝐓𝐨𝐅𝐫𝐨𝐳𝐞𝐧𝐒𝐞𝐭, provide a read-only dictionary and set optimized for fast lookup and enumeration.
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When you use inheritance in models, you can be not satisfied with the default EF Core columns order in the created tables.
In EF Core 6.0, you can specify columns order with ColumnAttribute.
#dotnet6
#efcore6
#coding
#devcommunity
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All my 26 tweets about Entity Framework Core 5.0 features in one thread for better accessibility 🧵
It's not a complete list, more features you can find by the link below 👇
Retweets are appreciated 😊
#dotnet
#efcore
#coding
#DEVCommunity
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Did you know you can write an extension method for GetEnumerator for Range type?
It allows the use of range syntax directly in the foreach loops.
7
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New math APIs have been added in .NET 6.
New methods:
• SinCos
• ReciprocalEstimate
• ReciprocalSqrtEstimate
New overloads:
• Min, Max, Abs, Sign, Clamp supports nint and nuint
• DivRem variants return a tuples
#dotnet6
#coding
#devcommunity
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A year ago I posted my first tweet about .NET.
Twitter forced me to create a blog and give my first public talks.
I have been rewarded Microsoft MVP.
More than 10k people followed me here and more than 3k on LI.
When I started, I couldn't imagine the outcome.
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