Convert iformfile to memorystream


  • Uploading Files In Blazor
  • Zip and unzip a string of data in memory
  • unit testing an iformfile that is converted into system.drawing.image in c#
  • Uploading Files In ASP.NET Core
  • 15 Lessons Learned while Converting from ASP.NET to .NET Core
  • How to Convert Image to PDF in ASP.NET Core
  • Uploading Files In Blazor

    NET to. NET Core over the last few months. We ported StackifyLib and our logging appenders over. We have also made sure that our app performance tools, Prefix and Retrace, can be used to profile. NET Core based apps. Below are some of the things we have learned to help convert ASP.

    NET Core. NET Core 1. You move everything to xproj, but then you can no longer use MSBuild. It is possible to use xproj and csproj files both at the same time which is ultimately what we ended up doing for our Windows targeted builds of Prefix. Check out our other blog post on this topic.

    Building for deployment If you are planning to build an app that targets non-Windows, you have to build it on the target platform. You can do that with a netstandard library, but not a netcoreapp. They are hoping to remove this limitation in the future. NetStandard vs NetCoreApp1. NetStandard is designed as a common standard so that.

    NET 4. So, if you are making a shared library that will be a nuget package, it should be based on NetStandard. If you are targeting Windows, you can also just target.

    IIS is dead, well sort of As part of. The goal behind it has been to make it as lean, mean, and fast as possible. IIS is awesome but comes with a very dated pipeline model and carries a lot of bloat and weight with it.

    In some benchmarks , I have seen Kestrel handle up to 20x more requests per second. Kestrel is essentially part of. NET Core which makes deploying your web app as easy as deploying any console app.

    As matter of fact, every app in. NET Core is essentially a console app. When your ASP. This is similar to how self hosted Web Api projects worked with Owin. Things like virtual hosts, logging, security, etc. NET Core apps. You simply use Kestrel. All the self hosted packages for WebApi, SignalR and others are no longer needed. Every web app is basically self hosted now. It is similar to how Owin and other languages handle this sort of functionality. They are very easy to work with.

    Check out the ASP. NET docs to learn more. They are all set in code. FileStream moved to System. Some basic classes that everyone uses on a daily basis have been moved around to different packages. Something as common as FileStream is no longer in the System. You now have to add the package System. StreamReader constructor no longer works with a file path Some simple uses of standard libraries have changed. A good example is the StreamReader which was often used by passing in a file path to the constructor.

    Now you have to pass in a stream. This will cause small refactorings to use a FileStream in addition to the StreamReader everywhere. Another good example of this is around reflection. GetType now returns a more simplified object for performance reasons and you must do a GetTypeInfo to get the full details.

    Luckily that is backwards compatible to. Platform specific code… like Microsoft specific RSA. But some of your code could potentially compile on Windows but then fail at runtime when you run it on a Mac or Linux.

    Instead you have to use RSA. Create which is a more generic implementation and has slightly different methods. Both are in System. Confusing huh? Newtonsoft now defaults to camelCase. We ended up using the JsonProperty attribute on some things to force their casing how we needed them. This one is a big land mine, so watch out for it.

    TeamPascalCase Log4net is a pretty fundamental library used by countless developers. It has not been ported to core, yet. NLog and Serilog work and you will have to switch logging providers. Before converting anything to core, you need to review all of your referenced dll dependencies to ensure they will work with core. But as long as you are targeting Windows, you can target. If you have to go cross platform… watch out for dependency problems.

    Be sure to check out our entire article about ASP. NET Core Logging. Update: log4net has been updated to work with. NET Core Not with the. NET framework currently. There are some community projects that you can use. NET 5 Actually, some do. Works like a charm. Visual Studio Tooling We have seen a lot of weirdness with intelligence and Visual Studio in general.

    Sometimes it highlights code like it is wrong, but it compiles just fine. Being able to switch between your framework targets is awesome for testing your code against each. Although we just removed net as a target framework from my project, but Visual Studio still thinks we are targeting it….

    There are still a few bugs to be worked out. HttpWebRequest weird changes In. Well, in core they decided to reverse course and you have to use the header collection. This requires some hackery and compiler directives… Otherwise you get errors like this from your. We need some extension methods for core to make it backwards compatible. Creating a Windows Service in.

    NET Framework. You will need move your. Read More: How to Create. They have always been very similar to work with and either could be used for API type applications. So in a lot of ways, merging them made sense. NET core features. Entity Framework Core has quite a few differences. If you are working with.

    Zip and unzip a string of data in memory

    Uploading files in ASP. We will go over both methods of uploading a file in ASP. Model Binding IFormFile Small Files When uploading a file via this method, the important thing to note is that your files are uploaded in their entirety before execution hits your controller action. What this means is that the disk on your server holds a temporary file while you decide where to push it.

    With this small files this is fine, larger files you run into issues of scale. If you have many users all uploading large files you are liable to run out of ram where the file is stored before moving it to disk , or disk space itself.

    Your controller action is actually very simple. Other than that, you are there and done. There is nothing more than you need to do. Streaming Files Large Files Instead of buffering the file in its entirety, you can stream the file upload. This does introduce challenges as you can no longer use the built in model binding of ASP.

    NET core. First, take this helper class and stick it in your project. This code is taken from a Microsoft project here. RemoveQuotes contentType. NET Core 2. IsNullOrEmpty contentDisposition. It takes an input stream which is where your file will be written to. This is kept as a basic stream because the stream can really come from anywhere.

    IsMultipartContentType request. Parse request. ReadNextSectionAsync ; while section! TryParse section. RemoveQuotes contentDisposition. ReadToEndAsync ; if String. Equals value, "undefined", StringComparison. Append key. Value" from key if formAccumulator. Form, new FormCollection formAccumulator. GetResults , CultureInfo. Equals mediaType. This is important otherwise C will still try and load the contents of the request regardless.

    The attribute looks like : [AttributeUsage AttributeTargets. Class AttributeTargets. We create a stream and pass it into the StreamFile extension method. The output is our FormValueProvider which we use to bind out model manually after the file streaming. Remember to put your custom attribute on the action to force the request to not bind.

    The biggest downside is ofcourse that the viewmodel details are not available until the file has been streamed. Learned Something New?

    By buying me a coffee As a one off or monthly , you ensure I have the optimal caffeine levels to continue reading patch notes and wading through shoddy documentation to give you nothing but the important bits of. Related Posts.

    unit testing an iformfile that is converted into system.drawing.image in c#

    NET Core over the last few months. We ported StackifyLib and our logging appenders over. We have also made sure that our app performance tools, Prefix and Retrace, can be used to profile. NET Core based apps. Below are some of the things we have learned to help convert ASP. NET Core. NET Core 1. You move everything to xproj, but then you can no longer use MSBuild.

    It is possible to use xproj and csproj files both at the same time which is ultimately what we ended up doing for our Windows targeted builds of Prefix. Check out our other blog post on this topic. Building for deployment If you are planning to build an app that targets non-Windows, you have to build it on the target platform. You can do that with a netstandard library, but not a netcoreapp.

    Uploading Files In ASP.NET Core

    They are hoping to remove this limitation in the future. NetStandard vs NetCoreApp1. NetStandard is designed as a common standard so that. NET 4. So, if you are making a shared library that will be a nuget package, it should be based on NetStandard.

    If you are targeting Windows, you can also just target. IIS is dead, well sort of As part of. The goal behind it has been to make it as lean, mean, and fast as possible. IIS is awesome but comes with a very dated pipeline model and carries a lot of bloat and weight with it. In some benchmarksI have seen Kestrel handle up to 20x more requests per second. Kestrel is essentially part of. NET Core which makes deploying your web app as easy as deploying any console app.

    As matter of fact, every app in. NET Core is essentially a console app. When your ASP. This is similar to how self hosted Web Api projects worked with Owin. Things like virtual hosts, logging, security, etc. NET Core apps. You simply use Kestrel.

    15 Lessons Learned while Converting from ASP.NET to .NET Core

    All the self hosted packages for WebApi, SignalR and others are no longer needed. Every web app is basically self hosted now. It is similar to how Owin and other languages handle this sort of functionality. They are very easy to work with. Check out the ASP. NET docs to learn more. They are all set in code. FileStream moved to System. Some basic classes that everyone uses on a daily basis have been moved around to different packages. Something as common as FileStream is no longer in the System.

    You now have to add the package System. StreamReader constructor no longer works with a file path Some simple uses of standard libraries have changed. A good example is the StreamReader which was often used by passing in a file path to the constructor. Now you have to pass in a stream. This will cause small refactorings to use a FileStream in addition to the StreamReader everywhere. Another good example of this is around reflection.

    IsMultipartContentType request. Parse request. ReadNextSectionAsync ; while section! TryParse section. RemoveQuotes contentDisposition. ReadToEndAsync ; if String. Equals value, "undefined", StringComparison. Append key. Value" from key if formAccumulator. Form, new FormCollection formAccumulator. GetResultsCultureInfo. Equals mediaType. This is important otherwise C will still try and load the contents of the request regardless.

    The attribute looks like : [AttributeUsage AttributeTargets.

    How to Convert Image to PDF in ASP.NET Core

    Class AttributeTargets. We create a stream and pass it into the StreamFile extension method. The output is our FormValueProvider which we use to bind out model manually after the file streaming.

    Remember to put your custom attribute on the action to force the request to not bind. The biggest downside is ofcourse that the viewmodel details are not available until the file has been streamed.

    Learned Something New?


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