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    Recognizing printed text on images using Azure Computer Vision API

    # 2017-11-08 13:30:00, DT blogi
    Microsoft Azure Cognitive Services offer 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 print...
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    Running ASP.NET Core applications on Windows Subsystem for Linux

    # 2017-11-03 12:01:00, DT blogi
    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 Linu...
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    Server-side charts with ASP.NET Core, Node services and D3.js

    # 2017-10-25 10:49:00, DT blogi
    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. Why Node...
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    NotSupportedException: No data is available for encoding 1252

    # 2017-10-05 09:22:00, DT blogi
    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. H...
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    ASP.NET Core and IIS: 502.5 Process Failure 0x80004005 : 80008083

    # 2017-09-29 10:24:00, DT blogi
    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. It usually comes d...
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    Defensive database context for multi-tenant ASP.NET Core applications

    # 2017-09-04 10:40:00, DT blogi
    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 situat...
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    Unit testing multi-tenant database provider

    # 2017-08-29 11:36:00, DT blogi
    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-tena...
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    Handling missing tenants in ASP.NET Core

    # 2017-08-24 10:00:00, DT blogi
    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 request...
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    Implementing database per tenant strategy on ASP.NET Core

    # 2017-08-23 10:22:00, DT blogi
    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 servic...
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    Implementing tenant providers on ASP.NET Core

    # 2017-08-22 10:29:00, DT blogi
    In my previous post about global query filters in Entity Framework 2.0 I proposed an idea how to automatically apply query filters to all domain entities when model is built so enitites are always coming from the same tenant. This post digs deeper to possible solutions for detecting current tenant i...
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    Using bearer tokens in ASP.NET Core

    # 2017-08-21 10:34:00, DT blogi
    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 Dir...
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    Hiding search suggestion in Search Results Web Part

    # 2017-08-18 09:38:00, DT blogi
    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. What I w...
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    ASP.NET Core: Building enum provider to convert C# enums to JavaScript

    # 2017-08-17 09:30:00, DT blogi
    My previous post about ASP.NET Core and getting C# enums to JavaScript was primitive and used simple attribute on enums to detect ones we need in JavaScript. This blog post extends the idea and makes some generalizations to support also those enums that are located in the libraries we don’t control ...
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    Global query filters in Entity Framework Core 2.0

    # 2017-08-16 09:00:00, DT blogi
    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 applic...
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    Like-operator in Entity Framework Core 2.0

    # 2017-08-15 11:11:00, DT blogi
    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 simple web application that demonstrates using of new Like-operator. Let’s start with simple Songs table in SQL Server ...

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