I need to use the REST feature, HttpMultipartMimeForm, which I believe belongs to Microsoft.Http.dll. But in my .Net 4.0 project I couldn't find it anywhere. I do have my project's Target framework configured as .Net Framework 4, not ..Client Profile, and as an evidence, I do have the System.ServiceModel.Web assembly in the available .net reference list. But I still don't have the Microsoft.Http.dll and therefore, don't have the class I need. I think I may be able to get the dll if I download and install WCF REST Starter Kit but why do I have to do that? .Net 4 is supposed to have it as part of standard, isn't it?
It's now called MultipartFormDataContent and it is in System.Net.Http. You can get the nuget from here http://nuget.org/packages/Microsoft.Net.Http/2.0.20710.0
Related
I'm in the process of converting an Asp.Net Core 2.2 Website that targeted the Full Framework to an Asp.Net Core 3.1 App that targets .Net Core 3.1. I'm a bit unclear about dependencies related to System.Drawing and how to fulfill them.
My project uses System.Drawing and when compiling under Asp.Net Core 3.1 I get this error that suggests that I add a reference to System.Drawing.Common.dll :
Error CS1069: The type name 'Image' could not be found in the namespace 'System.Drawing'. This type has been forwarded to assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' Consider adding a reference to that assembly. 1-wwwGiftOasis3 C:\Users\Ron\source\repos\wwwGiftOasis3\wwwGiftOasis3\site\seller\profile\about\s-photos.cs
In Visual Studio I don't see a way to add a reference directly to the bare System.Drawing.Common.dll so I assume that I should add the reference via NuGet.
In NuGet I see a System.Drawing.Common package which looks like what I want but it's unclear to me whether my project fulfills the dependencies:
My Project shows these dependencies:
So I have a couple questions related to all this:
1) Does the fact my the project depends on Framework Microsoft.NETCore.App fulfill the NuGet package's Microsoft.NETCore.Platforms dependency?
2) Does the fact that I intend to only run this Asp.Net Core 3.1 website on windows fulfill the NuGet package's Microsoft.Win32.SystemEvents dependency?
System.Drawing utilizes Windows-specific APIs, and as such, is incompatible with .NET Core, which is cross-platform. Microsoft created System.Drawing.Common as an in-place replacement for System.Drawing for .NET Core. It is an exact API replacement, but performs the image operations in a cross-platform, rather than Windows-specific, way.
Long and short, yes, you just drop the NuGet into your project and go to town. There's nothing else you need to worry about.
I'm building a Web API in .NET Core 2. I'm using some custom nuget packages to leverage their built in functionality. These custom packages were built against an older .NET version (4.6.1). The problem is some of these packages have references to the old System.Web dll. I'm getting this warning on some of the custom packages in the solution
package was restored using '.net framework version=v4.6.1 instead of using the proj target framework.
The app is also throwing this exception below when I call code in one of the custom packages
System.IO.FileNotFoundException: Could not load file or assembly System.Web.ApplicationServices, Version=4.0.0.0, Culture=neutral,The system cannot find the file specified
Is there any way around this other than re-writing the code in my web Api?
No. System.Web is completely incompatible with Core. While Microsoft opened up NuGet packages that target .NET Framework to be utilized in with .NET Core, it did so based only on .NET Standard 2.0 compatibility, and makes no assurances that the packages will function in part or whole. You'll actually get a warning during compile telling you as much. Also, while you can actually have something like an ASP.NET Core app actually target .NET Framework, again, compatibility of third-party components is not guaranteed, simply because they target the same framework.
Long and short, if there's any dependency on System.Web at all, you can't use it.
Need to embed a json file as a source for testing in my .NET Core application. The author of this post http://codeopinion.com/asp-net-core-embedded-resource/ provided sample code that included the use of var assembly = Assembly.GetExecutingAssembly();However when I try this I get the error: Cannot resolve symbol ‘GetExecutingAssembly’ and ‘Assembly’ does not contain a definition for ‘GetExecuringAssembly’
If you are targeting .NET Standard 1.5 or above, you may call any of the following:
System.Reflection.Assembly.GetExecutingAssembly();
System.Reflection.Assembly.GetEntryAssembly();
System.Reflection.Assembly.GetCallingAssembly();
If targeting earlier versions of .NET Standard then the typeof(SomeClass).GetTypeInfo().Assembly method is the only way.
There is no "static" Assembly class in .NET Standard prior to version 1.5. Instead you have to do something like:
typeof(<AClassHere>).GetTypeInfo().Assembly
Where <AClassHere> should be replaced by the name of a class/type in the assembly you wish to load.
Nope, it's not available in .NET Core 1.0/1.1.
However, if I remember correctly it will be back in .NET Core 2.0 and the netstandard2.0 which is to be released later this year, which will have a much bigger API surface and increased compatibility with libraries written against .NET >= 4.5 making it easier to port these to .NETStandard 2.0/2.1.
But many of the APIs implementations will be platform dependent. Means, you will be able to call SomeAPI.GetSomething() everywhere, but if run on .NET Core it may throw a PlatformNotSupportedException.
But most APIs about assembly scanning and discovering should be back in .NET Core/Standard 2.0. Stuff around AppDomain will still be missing as there are no AppDomains in .NET Core and processes should be used for isolation.
Our project structure is like,
native.dll :- This contains pure native code written in c\c++.
This native.dll exposes some functions using *def file.
Wrapper Library(wrapper.dll compiled with .Net framework v4.0) :-
In order to use functionality of native.dll, a Wrapper lib(wrapper.dll)
is written in C++\CLI using :clr\oldsyntax. This wrapper has all
code of Interoperability and Marshalling.
Application(Console App v4.0) directly uses wrapper.dll to use functionality provided
by native.dll.
Now this project needs to run in .Net Core. This means we will have an
.Net Core application that will reference wrapper.dll that in turn will refer
native.dll.
I know this will not directly work. But the issue is whether .Net Core(CoreCLR) supports
C++\CLI (clr\oldsyntax) runtime environment ?
If no, what can be the possible solutions to this application work ?
whether .Net Core(CoreCLR) supports C++\CLI (clr\oldsyntax) runtime environment ?
As far as I know there is no plan to support C++/CLI with .NET Core.
If no, what can be the possible solutions to this application work ?
You can (should) provide a C API. Mono e. g. supports P/Invoke and .NET Core also supports P/Invoke (see also this Stack overflow question and this DllMap related ticket).
Update (2022-09-02): This answer is from 2016. See the other answers (e.g., this) for what is possible with recent .Net Core versions.
Officially announced eventually...
(next wish... support linux # .Net 5 ^^)
https://devblogs.microsoft.com/cppblog/the-future-of-cpp-cli-and-dotnet-core-3/
C++/CLI will have full IDE support for targeting .NET Core 3.1 and higher. This support will include projects, IntelliSense, and mixed-mode debugging (IJW) on Windows. We don’t currently have plans for C++/CLI for targeting macOS or Linux. Additionally, compiling with “/clr:pure” and “/clr:safe” won’t be supported for .NET Core.
The first public previews for C++/CLI are right around the corner. Visual Studio 2019 16.4 Preview 1 includes an updated compiler with “/clr:netcore”
Updat: From replied of origin url:
"We are still working on the IDE and MSBuild integration, so I can’t share a sample project quite yet. Once it’s available, likely with 16.4 Preview 2 or 3"
(16.4 Preview1 cannot create C++/CLI with .NetCore project.)
191015
16.4 Preview2 Released.
I'v tried asp.net core 3.1 with c++/CLI dll, it works.
(need set plateform to x64 both asp.net core and c++/CLI dll)
.net Core team will only commit (now?) to supporting C++/CLI for Windows only.
The intention was to deliver it for .net Core 3.0. While I haven't found explicit mention of it yet in the release notes, C++/CLI support was a prerequisite for delivering WPF (windows-only), which is now supported in .net Core 3.0.
Support mixed-mode assemblies on Windows - #18013
This issue (#18013) will track progress toward supporting loading and running
mixed-mode assemblies on CoreCLR. The main goal is to provide support
for WPF and other existing C++/CLI code on .NET Core. Some of the work
will be dependent on updates to the MSVC compiler.
The github issue (#659) mentioned above by #Tomas-Kubes, Will CoreCLR support C++/CLI crossplat? - #659, is about cross-platform C++/CLI.
BTW, I am getting compiler warnings on "clr\oldsyntax" with VS2017/.net-4.7. So this compiler flag is already deprecated.
UPDATE: This isn't coming till .Net Core 3.1
Another potential solution (though obviously quite a difficult task) if you want to stick with C++ (i.e. expose an OO interface to .NET) might be to have a look at CppSharp from the mono project. It is able to expose native C++ code through an automatically generated C# wrapper. It supports Windows, Linux as well as OSX. However, I don't know if the generated code can be compiled to a .NET standard target (didn't try to). I can only suppose it would because the generated code does not use any fancy API (it is basically interop and marshalling code); and, by the way, it is also possible to customize the generation process (although, once again, probably not an easy task).
For those who are looking at this for general .Net Core stuff without specific clr parameters (as this is a high result on google) Microsoft have written a guide on how to port C++/CLI to .Net Core:
https://learn.microsoft.com/en-us/dotnet/core/porting/cpp-cli
Port a C++/CLI project
To port a C++/CLI project to .NET Core, make the following changes to the .vcxproj file. These migration steps differ from the steps needed for other project types because C++/CLI projects don't use SDK-style project files.
Replace <CLRSupport>true</CLRSupport> properties with <CLRSupport>NetCore</CLRSupport>. This property is often in configuration-specific property groups, so you may need to replace it in multiple places.
Replace <TargetFrameworkVersion> properties with <TargetFramework>netcoreapp3.1</TargetFramework>.
Remove any .NET Framework references (like <Reference Include="System" />). .NET Core SDK assemblies are automatically referenced when using <CLRSupport>NetCore</CLRSupport>.
Update API usage in .cpp files, as necessary, to remove APIs unavailable to .NET Core. Because C++/CLI projects tend to be fairly thin interop layers, there are often not many changes needed. You can use the .NET Portability Analyzer to identify unsupported .NET APIs used by C++/CLI binaries just as with purely managed binaries.
Build without MSBuild
It's also possible to build C++/CLI projects without using MSBuild. Follow these steps to build a C++/CLI project for .NET Core directly with cl.exe and link.exe:
When compiling, pass -clr:netcore to cl.exe.
Reference necessary .NET Core reference assemblies.
When linking, provide the .NET Core app host directory as a LibPath (so that ijwhost.lib can be found).
Copy ijwhost.dll (from the .NET Core app host directory) to the project's output directory.
Make sure a runtimeconfig.json file exists for the first component of the application that will run managed code. If the application has a managed entry point, a runtime.config file will be created and copied automatically. If the application has a native entry point, though, you need to create a runtimeconfig.json file for the first C++/CLI library to use the .NET Core runtime.
There are some more nuances but these are the actual steps to port
I'm having a problem with assembly resolution on an end-user machine and I believe it's related to using Portable Class Libraries....
I have a .NET 4.0 application that was originally written in Visual Studio 2010. Recently we upgraded to Visual Studio 2012 and we've created a few projects that are Portable Class Libraries. I don't believe we need these features now, but we're also building a Windows 8 Store application that might benefit from these libraries.
When I compile my project, what exactly does the portable library feature do? I expect that it allows me to run it on different frameworks without modification or recompiling.
When I look at the library in reflector dotPeek it shows the Platform attribute as:
.NETPortable,Version=v4.0,Profile=Profile5
And the references seem 2.0-ish:
mscorlib, Version=2.0.5.0
System, Version=2.0.5.0
System.Runtime.Serialization, Version=2.0.5.0
When I run the application on this end-user's machine, I see an error in the log file:
Could not load file or assembly, 'System.Core, Version=2.0.5.0...'
Googling System.Core 2.0.5.0 seems to refer to SilverLight -- which appears to be one of the targeted frameworks.
This machine does not have Visual Studio installed, but has .NET 4.0 (4.0.3 update)
Is there something I should be doing differently to compile, something I should investigate in my dependencies or something I should be looking to install on the end-user machine? What does the 2.0.5.0 refer to?
For .NET 4, you need an update (KB2468871) for Portable Class Libraries to work. From the KB Article:
Feature 5
Changes to the support portable libraries. These changes include API
updates and binder modifications. This update enables the CLR to bind
successfully to portable libraries so that a single DLL can run on the
.NET Framework 4, on Silverlight, on Xbox, or on the Windows Phone.
This update adds public Silverlight APIs to the .NET Framework 4 in
the same location. The API signatures will remain consistent across
the platform. All modifications are 100 percent compatible and will
not break any existing code.
Also see the "Deploying A .NET Framework App" section of the MSDN Portable Class Library Documentation.
EDIT: Actually, if the machine has .NET 4.0.3 installed as you mention, that should be sufficient. Can you double-check to make sure that it is actually installed?