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Thursday, April 15, 2021
dotPeek: a Totally Free Alternative for .NET Reflector
Friday, April 9, 2021
Problems Migrating From SQL Server Management Studio (SSMS) v17 to v18
Wednesday, March 31, 2021
Reorder Columns in Spark DataFrame with Select() and Scala
Sometimes, when dealing with a Spark data frame it may be necessary to reorder columns in a certain order. For example, to keep data consistent when trying to union two or more data frames with the same schema but different order of columns. Let's explore how that can be done relatively easy using a select()
Spark SQL function.
Thursday, March 18, 2021
Incorrect ReSharper Behavior for CS1591 Warning
After upgrading from Visual Studio 16.8.x to 16.9.x the JetBrains ReSharper suddenly started marking a lot of public identifiers in the code as compiler errors with a message: "Missing XML comment for publicly visible type or member...". You can imagine how that can be very annoying.
Wednesday, February 3, 2021
.NET Web API: Confusing 404 Response to OPTIONS Request for CORS pre-flight

Problem: when a Angular applications sends an OPTIONS request to its own backend to satisfy CORS preflight policy it unexpectedly receives a 404 response from a .NET Core Web API application that effectively blocks an actual data data request from executing correctly. If you have ever experienced this problem, continue reading to understand what the problem is and how to fix it.
Saturday, December 26, 2020
C#/.NET: Validate Anonymous Objects During Unit Testing
Say, we have developed a REST API based on .NET Web API framework and need to write a unit test for an end point that returns a collection of objects. This sounds like a usual trivial task that many developers do all the time. Unless, the API method that we need to test, returns a collection of anonymous objects, that is the API method is written using a C# anonymous or dynamic type to construct objects that are included in the list.
It's totally fine when the endpoint is consumed over HTTP as the result is first serialized into JSON for transfer and then de-serialized back into a JavaScript object on a consumer side. If, however, the endpoint is called directly in C# without JSON conversion, like in a unit test, it's an entirely different story. Let's discuss how we can overcome this issue.
Friday, December 18, 2020
Angular: Mock NgRedux for Unit Testing
If you use Redux
in your Angular web application (likely it is an NgRedux
from Angular Redux) and develop unit tests for components that depend on the Redux
store sometimes it's easier to mock the Redux
store rather than deal with incorrect values that it may supply in a test scenario. If this sounds like your situation, read on.
Friday, November 27, 2020
.NET Core OData: How to Construct a DateTime Filter
Friday, November 20, 2020
Reuse a MemoryStream without Writing to a FileStream
MemoryStream
is a very useful class as it allows working with a Stream-like data in memory without having dependencies on any external resources like files, etc. Even though the MemoryStream
implements an IDisposable
interface it does not actually have any critical resources to dispose of, so, explicitly disposing of a MemoryStream
object is not strictly necessary as the .NET memory management will take care of it. This specifics presents an opportunity of reusing the MemoryStream
object if needed across multiple code scopes.