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Preview: Rick Strahl's Web Log

Rick Strahl's Web Log

Life, Surf, Code and everything in between


New CODE Magazine Article: Getting down to Business with ASP.NET Core

Thu, 12 Jan 2017 20:19:27 GMT

The January/February 2017 issue of Code Magazine has an ASP.NET Core article of mine as the lead cover article: Yay! You can check out the magazine when it arrives, or you can take a look online on the CODE Magazine Site to read it there: Getting down to Business with ASP.NET Core Get a print copy of CODE Magazine Two ways to approach ASP.NET Core The article is a follow up to my previous Getting to the Core of ASP.NET Core Article article which took a very low level approach to describing how ASP.NET Core works from the ground up using command line tools and working its way up from the very basics to a simple Web application. This new article takes a different approach and discusses how to build a more typical ASP.NET Core backend to an Angular front end application. The article focuses only on the backend (I'll cover the Angular 2 front end in a later article perhaps) and building a REST based service to provide the data to the Angular 2 front end. The sample application is a mobile friendly Album Viewer Web application that you can check out here: Album Viewer online Sample West Wind AlbumViewer on GitHub Here's what the app looks like in desktop mode: and here in Mobile mode on a phone: This CODE magazine article focuses entirely on the ASP.NET back end portion of the application and describes how to set up a new ASP.NET Core project, separate business and Web logic into separate projects. As with the last article the pace is such that I start at the very beginning with the basics and then build up from there. You'll see how to build up an entity model to return your data, deal with Entity Framework 7's different and more limiting features in a business object, and much more. I start with simple query results, go into more complex queries and updates that require more than a simple update. In short - the typical things you run into when you build a real world application. While the sample is fairly simple, it does highlight many real world issues that you run into. In addition the article also points out a few side issues like ensuring your app can serve proper CORS content so you can test a Javascript front end application that runs on a different domain/port properly and setting very simple authentication without delving into the .NET Identity morass. At the end I also demonstrate how to switch the database engine - I start with SQL Server and then switch to SqLite - and then move the entire application as is to a Mac and run the ASP.NET server without changes from there. All in all this article covers a wide swath of features that you are very likely to deal with in even the simplest applications. Check it out - I hope it'll be interesting and or useful to you in picking up ASP.NET Core. Read a Magazine! There aren't many magazines left around with so much online content around, but it sure is nice holding a paper copy in your hand sometimes. I still love the feel of reading an actual paper issue - especially if it has one of my own articles in there :-) CODE has a special deal going for signing up for a subscription, so check it out Sign up special for CODE Magazine this post created with Markdown Monster © Rick Strahl, West Wind Technologies, 2005-2017Posted in ASP.NET Core   ASP.NET   Angular   Tweet [...]

Back to Basics: String Interpolation in C#

Tue, 27 Dec 2016 08:12:59 GMT

String Interpolation provides string templating for string literals in C#. Rather than using string.Format you can use string interpolation to produce much more readable code that embeds expression values directly into string literals rather than escaping numeric arguments as you do with string.Format(). In this post I look at how string interpolation works, what the compiler does under the covers and some common use cases where it makes life easier.(image)

Downgrading a .NET Applications from 64 bit to 32 bit for the WebBrowser Control

Fri, 23 Dec 2016 09:14:52 GMT

Recently while working on Markdown Monster I ran into some odd crashes and behaviors when interacting with the Web Browser control in this WPF application. It turns out that some of these inconsistent behaviors are apparently caused by running hte application in 64 bit mode. Switching to 32 bit mode has made the application and Web Browser interaction much more responsive and has stopped the nagging unexplainable crashes. In this post I look at 32 and 64 bit applications in .NET and outline some of the issues I ran into and how I fixed the problem by switching to building a 32 bit app.(image)

Visual Studio Debugging and 64 Bit .NET Applications

Mon, 19 Dec 2016 08:26:59 GMT

Recently while debugging a 64 bit application I found out the hard way that Visual Studio by default will use 32 bit debugging even when running what would otherwise be a 64 bit .NET application. There are a number of options that determine the bitness of your application, but the debugger often behaves differently than your standalone application. In this post I describe, why this might be a problem in some situations and how you can get the debugger to run in 64 bit.(image)

WPF Rendering DUCE.Channel Crashes due to Image Loading

Thu, 15 Dec 2016 09:43:47 GMT

I ran into a nasty WPF rendering bug that affected only a few select machines. Rendering problems in WPF can be terribly difificult to debug because there often is no additional information on what failed and the exceptions that occur are not trappable but fall back to application wide error handling. In this post I describe a specific failure caused by a 'bad' image WPF can't deal with and how I tracked it down and fixed it.(image)

Loading .NET Assemblies out of Seperate Folders

Mon, 12 Dec 2016 09:49:25 GMT

In the process of updating the Addin manager in Markdown Monster I ran into a few snags with loading .NET assemblies out of separate folders. Assembly loading out of non base folders in .NET can be problematic and sure enough I ran into a few issues that took a while to find a work around for. In this post I describe some of the issues of folder based assembly loading and a brute force solution to deal with assembly resolution.(image)

.NET Standard 2.0 - Making Sense of .NET Again

Wed, 23 Nov 2016 09:29:40 GMT

It's taken awhile but it seems Microsoft is finally nailing the message for .NET going forward and .NET Standard with its common API specification is a huge part in making sure that the same base library of .NET is available on all .NET platforms. In this post I look at what .NET Standard is, how it works and what some of the surrounding issues and impacts are for the .NET Eco system.(image)

Introducing Markdown Monster - a new Markdown Editor

Fri, 04 Nov 2016 08:14:57 GMT

I'm happy to announce Version 1.0 of Markdown Monster a Markdown Editor and Weblog Publishing tool for Windows. In this post I give a quick tour of Markdown Monster and provide links to all you need to know to check out this great new Markdown editor.(image)

Windows Update Hell

Thu, 03 Nov 2016 19:26:45 GMT

I've been fighting Windows Update Hell for the last month with failed updates wreaking havoc on my machine. Updates fail to install completely and roll back and then continue to retry each day. Attempts to turn off the particular update now fails as well, so I'm stuck in this groundhog day like loop of pain. This is a cry for help, in hopes somebody has additional ideas on what to try.(image)

C# NumberFormat Sections

Thu, 03 Nov 2016 17:27:56 GMT

In all the years I've been using C#, I've completely missed that the NumberFormat features using .ToString() or string expressions support sections for positive, negative and zero values. In this post I describe the feature and how it works.(image)

Excluding the node_modules Folder in Visual Studio WebSite Projects

Sun, 30 Oct 2016 19:42:40 GMT

If you're working on a client side project that includes an NPM folder with a large number of dependencies and you're using a WebSite Project in Visual Studio, you've probably found that this is a terrible combination out of the box. In this post I describe why this is a problem and how you can work around it with a simple hack.(image)

Automating Installation Builds and Chocolatey Packaging

Wed, 26 Oct 2016 06:08:01 GMT

Having a quick and easy way to build a final deployable applicationsin a few minutes has been a huge motivation for me. I can update code and release a new build as soon as a feature is added or a bug is fixed, and my release cycle is much more frequent than it was before. I used to be much more conservative with releases - if something was broken it'd have to wait. But with an easy release mechanism all of that has changed and I can push new releases out much more frequently and I really like the fact that it works this way. In this post I describe my deployment processing for Markdown Monster for creating an installer, publishing it on my Web site and creating and publishing a Chocolatey package.(image)

Error Handling and ExceptionFilter Dependency Injection for ASP.NET Core APIs

Mon, 17 Oct 2016 06:14:05 GMT

Exception handling in API applications is important as errors - both handled and unhandled - need to be passed to clients in some way to let them display error information. ASP.NET's default error handling doesn't provide for object error results by default, but you can use an ExceptionFilter to intercept exceptions and format them yourself. In this post I look at how to create an API exception filter to create error object responses, and hook up custom logging of those errors to disk.(image)

Dealing with Anti-Virus False Positives

Wed, 05 Oct 2016 20:22:27 GMT

I've been struggling with false positive Anti-Virus warnings for Markdown Monster. In this post I describe what problems I was running into and how eventually managed to get a clean distribution of Markdown Monster out the door.(image)

External Network Access to Kestrel and IIS Express in ASP.NET Core

Thu, 29 Sep 2016 01:19:50 GMT

Recently I needed to connect to my Windows based ASP.NET Core API from my Mac and in order for that to work some configuration settings are necesary so that the ASP.NET applications can serve HTTP content to the external network connection that this entails. In this post I show what you have to do to enable remote connections both using the Kestrel and IIS Express Web servers.(image)

ASP.NET Core and CORS Gotchas

Mon, 26 Sep 2016 21:34:08 GMT

CORS is a requirement for cross domain XHR calls, and when you use Angular 2.0 default dev server and talk to an ASP.NET Core application you'll need to use CORS to get XHR to talk across the domain boundaries. Here's how to set up CORS and how to test it.(image)

Bootstrap Modal Dialog showing under Modal Background

Wed, 14 Sep 2016 17:42:32 GMT

On more than a few occasions I've run into issues with Bootstrap's Modal dialog rendering incorrectly with the dialog showing underneath the overlay. There are a number of ways around this problem, but none of them are universal that depend on how your pages are laid out. It's especially problematic for applications that dynamically render components where there's no good control on where the elements are placed outside of the components DOM containership. In this post, I describe a few of the workarounds and their limitations.(image)

External JavaScript dependencies in Typescript and Angular 2

Mon, 12 Sep 2016 08:21:30 GMT

Angular 2.0 and Typescript make it very easy to import external Typescript classes and references using the module loading functionality built into Typescript (and ES6). However, if you need to work with external libraries that aren't built with Typescript you need to do a little extra work in importing and referencing the external libraries. In this post I show two approaches for importing libraries as modules and dereferencing library globals so that the Typescript compiler is happy.(image)

Capturing Zoom Operations in the WPF Web Browser Control

Tue, 06 Sep 2016 01:55:14 GMT

If you need to capture Zoom operations in the Web Browser control - either to avoid letting hte user zoom or to capture the zoom operation and take action on it - you need to dig into the Web Browser's DOM events to capture the scroll wheel and key events. In this post I describe how you can do just that by looking at an application that captures scrolling and rather than zooming adjusts the font size of the content.(image)

Detecting and Setting Zoom Level in the WPF WebBrowser Control

Mon, 22 Aug 2016 07:25:01 GMT

Zoom level detection in the Web Browser control is a pain and in this article I describe one approach I used to both capture the current Zoom level in order to adjust font sizes, and then also explicitly set the Zoom level in the Web Browser control of a WPF application.(image)

Moving to Lets Encrypt SSL Certificates

Sat, 09 Jul 2016 19:18:32 GMT

This week marks the expiration of my last paid for SSL certificates and moving all certificates to Lets Encrypt. In the process I had a chance to moving some of my smaller personal and hobby sites as well as moving my wildcard cert for the main site. In this post I'll describe the process I'll describe what tools I used and the process I went through to gradually move my sites over to Lets Encrypt.(image)

First Steps: Exploring .NET Core and ASP.NET Core

Wed, 29 Jun 2016 23:30:51 GMT

In this post I'll demonstrate how to get started with .NET Core and ASP.NET using the Command Line Tools. I'll create a few very simple projects and starting with a plain console application, show how to hook up ASP.NET, run an API and MVC app and then run the app locally on Windows and then move it over to run on the Mac. This is not meant to be your typical getting started tutorial that jumps right into Visual Studio and creating a Web project from there. Rather, the purpose of this post is to demonstrate some of the core underpinnings of how .NET Core and ASP.NET Core projects are bootstrapped to run.(image)

ASP.NET Web Site Project Publishing and Changing ACLs

Wed, 29 Jun 2016 06:02:01 GMT

When publishing ASP.NET Web Site Projects, the project publish will overwrite server ACLs by clearing them to the inherited defaults and removing rights from common accounts. The result is that if you have custom ACLs set on the server they will be wiped by default. This occurs only on Web Site projects and in this post I remind myself of the .pubxml override setting that disables this default behavior(image)

Upgrading to ASP.NET Core RTM from RC2

Mon, 27 Jun 2016 19:04:29 GMT

I installed and upgraded an ASP.NET Core Sample application today and while the actual project upgrade process from RC2 was relatively easy, there were a few hiccups with installation and one of the breaking changes for the RTM release. In this post I'll go over some of the things I ran into and the workarounds.(image)