8 11 2017
Microsoft Cognitive Services offers us computer vision services to describe images and to detect printed or handwritten text. Text recognition provides interesting scenarios like cloud based OCR or providing automated translations for texts on images. This blog post focuses on recognizing printed text using Azure Computer Vision API.
3 11 2017
Windows 10 has something called Windows Subsystem for Linux and this something enables us to run Linux applications on Windows 10 using Linux without need for Hyper-V or other virtual machines. When building multi-platform applications like my open-source TemperatureStation solution then having Linux right there for testing comes very handy. This blog post shows how to get Linux running on Windows, how to install .NET Core and how to run web applications on Linux.
25 10 2017
ASP.NET Core introduces Node services that allow applications to run Node scripts on server. We can send data from controller action to Node script and get back some output we can use in view. This blog post shows how to use Node services to render d3.js charts on server-side to PNG files.
5 10 2017
Another day, another surprise on .NET Core. Tried to load a file with Windows-1252 encoding and got the following exception: NotSupportedException: No data is available for encoding 1252. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method. Here’s how to solve the problem.
29 09 2017
When running ASP.NET Core on IIS one may get weird error Application ‘‘ with physical root ‘’ failed to start process with commandline ‘”dotnet” .\MyApp.dll’, ErrorCode = ‘0x80004005 : 80008083. Here is one and most probable solution for this issue.
4 09 2017
In multi-tenant applications where tenants share same data store cross-tenant operations must be avoided. There are many ways how bugs like this can happen. Be it hard to debug threading issue or some other complex situation, it is better when application components are ready for this kind of situations and better fail instead of going to glory end with illegal operations. This blog post introduces defensive database context that throws exception when data from other tenants is about to be updated.
29 08 2017
My saga on supporting multiple tenants in ASP.NET Core web applications has come to point where tenants can use separate databases. It’s time now to write some tests for data context to make sure it behaves correct in unexpected situations. This post covers unit tests for data context and multi-tenancy.
24 08 2017
My last post about multi-tenants applications with ASP.NET Core Implementing database per tenant strategy on ASP.NET Core I proposed some ideas about tenant providers but I didn’t focused on issues related to missing tenants. This post proposes missing tenant middleware that redirects faulty requests to some public page of company web site.
23 08 2017
Let’s continue with multi-tenancy in ASP.NET Core web applications and focus on solutions where every tenant has its own database. It’s not only about database – there can be more services where every tenant has its own instance. It makes solution provided here easily extendable to also other services besides SQL Server or any other relational database.
22 08 2017
In my previous post about global query filters in Entity Framework 2.0 I proposed an idea how to automatically apply filters to all entities so they are always coming from same tenant. This post digs deeper to possible solutions for detecting current tenant in ASP.NET Core we applications.
21 08 2017
There are not much examples available about ASP.NET Core and acquiring access token. I found good and pretty big sample by Microsoft Patterns & Practices called multitenant-saas-guidance, Based on this I wrote my simple “boiler plate” ASP.NET Core solution that authenticates against Azure Active Directory and asks current user data using Microsoft Graph.
18 08 2017
I have page in SharePoint where users can search for specific type of items and see different results in Search Results Web Parts. The page I have has eight results web parts and when nothing is found I want to keep results web parts laconic and minimal so they don’t waste space on screen.
17 08 2017
16 08 2017
Entity Framework Core 2.0 introduces global query filters that can be applied to entities when model is created. It makes it easier to build multi-tenant applications and support soft deleting of entities. This blog post gives deeper overview about how to use global query filters in real-life applications and how to apply global query filters […]
15 08 2017
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.
14 08 2017
Today Microsoft announced versions 2.0 of .NET Standard, .NET Core, ASP.NET Core and Entity Framework Core. Also new updated to Visual Studio 2017 are available (both stable and preview version). This blog post is summary of most important features announced today.
14 08 2017
11 08 2017
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.
10 08 2017
After some Windows 10 IoT Core updates I discovered that it detected LifeCam Cinema camera connected to it. I tried it also few months ago but then Windows 10 IoT Core was not able to detect it. To find out if and how it works I wrote a primitive UWP application that shows picture from camera and saves photos made using webcam.
9 08 2017