Global query filters in Entity Framework Core 2.0
Entity Framework Core 2.0 introduces global query filters that can be applied to entities when model is created. It makes
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.NET
Like-operator in Entity Framework Core 2.0
Entity Framework Core 2.0 was announces yesterday and it brings some new and cool features. One of them is SQL Like-operator we can use now using directly in our code. Here is the example of using new Like-operator.
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Converting System.Drawing.Color to hex
One quick code note to make during building my Azure Cognitive Services demo application. I needed a way how to convert colors of System.Drawing to hex strings that I can use in views. Here is my simple and elegant solution.
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Running PHP applications on .NET Core
Ever wondered about mixing up simplicity and flexibility of PHP with power and performance of .NET Core? The solution is
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Local functions in C# 7.0
One of new features of C# 7.0 is support for local functions. Local functions are methods that are defined inside other methods to simplify more complex code and by example to support local recursion. This blog post shows how to use local functions in C# 7.0 and gives some advice in context of technical design of code.
Read moreSimple .NET Core application using VB.NET
.NET Core 2 Preview 1 bits bring us support for VB.NET on .NET Core. Although tooling for web applications is not ready yet we can start with console applications and also some web applications like I will show in some of my later posts. Visual Studio 2017 Preview 2 is needed to try VB.NET out on .NET Core. This blog post is short demo about how to build simple utility application on .NET Core 2 Preview 1 using VB.NET.
Read moreThrow expressions in C# 7.0
C# 7.0 introduces throw expressions. We can add exception throwing to expression-bodied members, null-coalescing expressions and conditional expressions. This blog post introduces throw expressions, demonstrates how to use them and also provides a peek behind a compiled throw expressions.
Read moreTuple literals in C# 7.0
C# 7.0 brings some new features to tuples and with code editors that support these new features we can use tuples with named members instead of names like Item1…ItemN. This blog post goes through practical example that demonstrates how to move on classic method that returns multiple values to new tuples.
Read moreOut variables in C# 7.0
C# 7.0 brings some features to out variables. These new features help us write cleaner code and handle out variables better. This blog post provides samples of these new features in C# 7.0 and as a surprise it also demonstrates what compiler is doing with these new features.
Read morePaging with Entity Framework Core
Paging query results is timeless topic and some days ago I got question about how to do it with Entity Framework Core. Using my previous work on paging I wrote some simple extension methods that work with IEnumerable
Fallback logger for Windows 10 IoT Core
We love to use our favorite logging solutions as much as possible but if external storage or external services are involved we cannot guarantee that logging works in crisis situation. This blog post introduces wrapper logger that uses main one to log all the messages and secondary one when main logger fails. Implementation is easy but there’s a good chance that log messages doesn’t get completely lost when main logging service goes down.
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Running Visual Studio Code on Linux
For my up-coming presentation “ASP.NET Core on Linux” I need Linux VM I can access with Remote Desktop to run Visual Studio Code. After hours of different problems that grew fast over my head I was able to make things work and now I have functioning VM I can use for demos. This post is short overview about what I did and it is for those readers who also want to have Linux VM with Visual Studio Code.
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Azure Search Suggesters: Helping users to find search keywords
Search is important feature of many apps and web sites because it is the main way for users to find quickly the information they are looking for. Typing search keywords to search box is not the end point of search we can provide to users. Sites that have huge amount of data can also help users to find out what keywords to use. In this post I will show how to use Azure Search suggesters to help users to find out these keywords.
Read moreWriting simple REST-client for Azure Search
In my last blog post about REST-clients Why Azure REST API-s and how to prepare for using them? I introduced how to write simple base class for Azure REST API-s. In this post we will implement simple REST-client for Azure Search. This is the same code that I’m using in my beer store sample application. I also make some notes about how to use search clients in domain models.
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Why Azure REST API-s and how to prepare for using them?
When new Microsoft Azure services come they usually have REST API-s available. Of course, there are usually client libraries available too as NuGet packages but usually not for every .NET flavour. Although Microsoft has plans to publish libraries for CoreCLR too it doesn’t happen always fast. Let’s see how REST API-s work and how to prepare for using them.
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BaseServer: Abstract class for timer based jobs
In one of my systems I’m using background process that hosts jobs that import and update some data and communicate with external services. These jobs are running after some interval or on specific moments. I generalized the common base part of these jobs so I can handle them as one in different background processes like Azure worker roles and Windows services. This blog post introduces my work and shows real-life implentation of jobs base.
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Beer IoT: Building Universal Windows Application to monitor cooling process
Our beer cooling solution is not controllable through IoT Hub and it reports data there. We can control our device through simple command line application but it is not enough for us. In this post we start building Universal Windows Application that helps us monitor temperatures. In this post we focus on mobile application.
Read moreBeer IoT: Visualizing sensors data using Power BI
We are eager to try out our beer cooling solution and we want to see it in action. We want to visualize our data and keep eye on temperature of cooling beer. Before doing anything more complex like building web or mobile app we make a quick shortcut and bring our data to web, desktop and mobile. This post is about Power BI in action.
Read moreBeer IoT: Using Stream Analytics to save data from IoT Hub to SQL database
When cooling beer we want to store history of temperatures for two reasons. First, it gives us valuable history data for next cooling sessions. As a second thing we can ask measurements when we temporarily lost connection with IoT Hub. In this posting we make some analyzis and then build up database for our beer cooling solution.
Read moreBeer IoT: Reporting measurements to Azure IoT Hub
As we have now fully functioning thermal solution running on Windows 10 IoT Core it’s time to focus to other components of our beer freezing solution. Our solution measures and calculates metrics of cooling beer but it doesn’t report this data anywhere. In this blog post we will set up Azure IoT Hub for our solution so it starts reporting measurements to Microsoft Azure.
Read moreBeer IoT: Estimating beer cooling time
In my last beer IoT post we measured out cooling rate of beer. In this post we try to estimate how long it takes for beer to start freezing. It’s actually simple calculation and we add it to our beer IoT background service before we focus on data reporting and persisting questions.
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