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In one of my current projects, I needed to render some barcodes. Google has a nice “Code 128” barcode font which makes rendering a barcode in a website pretty easy. However, in this particular application, I wound up needing to render the barcodes as images since the HTML that I render is fed into a PDF creator that doesn’t support font-face CSS stylings.

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Exceptions in .NET can be difficult to log or inspect due to their hierarchical nature with inner exceptions. Since the InnerException on a given exception is not an enumerated list, it requires a little bit of work to flatten the hierarchy.

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A while back, I started looking at ways to port EF6 code, that uses a lot of the API hooks and such, to Entity Framework Core. Over the past week, I managed to port a large scale application that was using EF6 to utilize EF Core. Here are some observations/tips in continuing with my Dotnet Core porting.

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Since the OAuth server I’ve detailed previously is using OWIN, I’ve been looking at what it will take to move it to .NET Core. The OWIN OAuth Server provides all of the Secure Token creation. This functionality is not provided with .NET Core’s native middleware.

My first thought is to integrate with IdentityServer4 or Openiddict which provide Secure Token generation and are .NET Core compatible. After some cursory information gathering, I’m putting a few research links here for later use.

https://blogs.msdn.microsoft.com/webdev/2016/10/27/bearer-token-authentication-in-asp-net-core/
https://blogs.msdn.microsoft.com/webdev/2017/01/23/asp-net-core-authentication-with-identityserver4/
https://github.com/openiddict/openiddict-core
https://www.scottbrady91.com/Identity-Server/Getting-Started-with-IdentityServer-4
http://stackoverflow.com/questions/35304038/identityserver4-register-userservice-and-get-users-from-database-in-asp-net-core

A while back, I wrote an application that processes sales information. These sales actually represent a hierarchy of data because there can be refunds, charge backs, charge backs of charge backs, refunds of refunds, adjustments, and so on and so forth. The way the data processing is handled, though, treating the entire hierarchy as a single transaction is important. This requires a bit of recursion.

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In one of my previous posts, I detailed using Table Value parameters. That method works great for my uses. However, I ran into one gotcha worth pointing out.

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One deficiency with Entity Framework is the ability to load data from a stored procedure or a direct query when the column names don’t match your model property names exactly. In one of my previous posts, I detailed how the EF API can be used to retrieve column mappings. These column mappings can be used in conjunction with a SqlDataReader to map a query result, properly, to your EF model.

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