i am having the following problem. i try to invoke platform specific code in the .NET MAUI from the microsoft tutorial.
https://learn.microsoft.com/en-us/dotnet/maui/platform-integration/invoke-platform-code
The problem here is that it can be compiled and builded with Visual Studio, but with Rider from Jetbrains it cant be compiled.
i m getting the following error message:
DeviceOrientationService.cs(5, 38): [CS8795] Partial method 'DeviceOrientationService.GetOrientation()' must have an implementation part because it has accessibility modifiers.
Anyone got an idea what i am missing?
So the thing is you need to create an implementation for your abstract method on all platform classes for it to be able to build since you are targeting multiple platforms.
So just like you have an implementation in your Android and iOS platforms you need it on others as well.
There is another way as well which is you can create an abstract method with an implementation that already does something on other platforms so assume this method is only relevant on Android and iOS then you would do something like below in this class:
public partial class DeviceOrientationService
{
#if ANDROID || IOS
public partial DeviceOrientation GetOrientation();
#else
public partial DeviceOrientation GetOrientation()
{
return DeviceOrientation.Undefiend;
}
#endif
}
Also if you don't want to support Tizen, Windows or MacCatalyst you can just remove their references from the csproj file and then you can delete their platform folders and you won't need to do the above-mentioned things at all your app will only expect Android and iOS code for the above project.
Related
I have a class library in .NET Framework 4.7.2 and I use a reference to Newtonsoft.Json Version 12... something.
If I run the app as a windows application (there is a winform) everything works just fine. However, it is actually a class library that is being called by another program as a plugin. Inside that program I get however this error
Which translates basically to "couldn't find the Assembly...". There Version=12.0.0.0 is begin referenced and the dll in that particular folder (the plugin folder) says version 12.0.3.23909
I tried to clean the solution, delete every reference to newtonsoft I found etc. but the result is always identical. What am I missing?
Sorry if this question has been answered before, I searched dozens of previous questions, but I can't seem to understand what is going on appart from "redo everything", which doesn't work here.
UPDATE
The output bin is as follows
If I change the program to a windows application and run it by calling the exe, it works, but not via the other program where it should run as a plugin. Interestingly, the core dll is being opened and the baseform works, but not newtonsoft.
Change at least one of the versions. I mean:
Change the version of Newtonsoft of your class library to -> 12.0.3.23909 and then build the class library and use it as a plugin.
Or change the Newtonsoft version of your project to 12.0.0 and then use your class lib as a plugin inside it.
Or:
You can carry Newtonsoft (12.0.0) with your class library and load both of Newtonsft and your class library as a plugin. (this works too but you should be aware of Dll conflict between 12.0.0 and 12.0.3)
I recently use Roslyn to compile and execute code at the runtime of a game application. Thank to some useful ressource such as this web site and Vendettamit answer, I manage to code a program on a C# Console Net Core project on window 10 which execute this code located in a txt file at the root of the application.
using System;
namespace Test15
{
public class Program
{
public static int Main()
{
System.Console.WriteLine("Hello World from external Dll !");
System.Console.WriteLine("And it work !");
return 10;
}
}
}
I'm not going to share code because it is really similar to Vendettamit answer, and this program work well on a C# Console Net Core project on window 10.
So next step, I try to make this program work with the C# Monogame Framework on a Android project which use Xamarin.
First problem : when trying to add the nugget package "Microsoft.CodeAnalysis" which seem necessary for Roslyn, I have the 2 following error :
Unable to resolve reference 'Humanizer', referenced by `Microsoft.CodeAnalysis.CSharp.Workspaces`.
Add NuGet package or assembly reference for 'Humanizer', or remove the reference to
'Microsoft.CodeAnalysis.CSharp.Workspaces'. Game2
Unable to resolve reference 'SQLitePCLRaw.core', referenced by `Microsoft.CodeAnalysis.Workspaces`.
Add NuGet package or assembly reference for 'SQLitePCLRaw.core', or remove the reference to
'Microsoft.CodeAnalysis.Workspaces'. Game2
(Translated from French)
When replacing the "Microsoft.CodeAnalysis" nugget package by "microsoft.CodeAnalysis.CSharp", both errors disappears.
However at the runtime, adding the MetadataReference don't work.
For instance in the Console project I use :
MetadataReference.CreateFromFile(typeof(object).GetTypeInfo().Assembly.Location);
To add a MetadataReference to mscorlib.dll, but on an Android project, it crash because typeof(object).GetTypeInfo().Assembly.Location return "mscorlib.dll" instead of somethings like "C:\Program Files\dotnet\shared\Microsoft.NETCore.App\3.1.9\System.Private.CoreLib.dll", because we are on Android I guess. (same with other MetadataReference )
So when calling the method CSharpCompilation.Create(), the "reference" argument is an array of null MetadataReference and it crash.
Based on what I read, I think (but I'm not sure) that Roslyn can't work on android because of the missing location of System.Object.
So can someone can confirm (or invalidate) if there is a way to work with Roslyn on Android ?
(Bonus point if you know some other way to compile/execute or "interpret" C# code on any device)
Thank for reading and stay safe.
I've a class which implements Android.Webkit.WebViewClient in my C# Xamarin project. However, the following error show up after I built the project with a fresh-install Microsoft Visual Studio 2017 in another machine:-
'CustomWebViewClient.ShouldOverrideUrlLoading(WebView, IWebResourceRequest)': no suitable method found to override
I guess it's due to the installed AVD API Level as the previous overload was deprecated in Android Nougat but I'm not sure how to fix it. Can someone throw me some light?
Additional info:-
Installed AVD (Android 6.0 | API Level 23)
Overload bool ShouldOverrideUrlLoading(WebView, string) (this should be marked obsolete but it's not the case when I check the class definition in Mono.Android.dll)
You have to put the ShouldOverrideUrlLoading override into CustomWebViewClient class, if you want to have access to your webview from this class the override has the webview in the parameters.
Alright I think I've found the solution. I need to download the latest API Level via Android SDK Manager as the project was set to compile using the latest platform by default which is missing in the new machine.
I am looking for System.speech to work in unity? Is there any way how to include this DLL in unity and MonoDevelop?
Because I'm trying to make a sound text to speech without spend the money from asset store. If System.Speech Library DLL could handle this why not. Just how to make it work with unity 5.3.5 ?
Also I have already try speechLib.dll. It is work while in editor but when Build to APK it is error and can't build.
Dlls files don't work on Android or iOS unless it is an unmanaged dll file without Windows specified API. If it is a Windows API or a managed dll then it won't work on Android or iOS.
You have two options: Buy a plugin or make your own. If you are only targeting Android and iOS then go for this Easy TTS which cost $5.
If you want to make one yourself then the process is very similar to my Speech to Text solution. The only difference are the classes used. Making one your self is easy. The only downside is that it is time consuming to make one for each platform.
Android:
TextToSpeech class.
iOS:
AVSpeechSynthesizer class
MacOS:
NSSpeechSynthesizer class
Windows:
ISpVoice class
There are tons of examples of how to use these on the internet. You have to make plugin for the Android class using Java, Objective-C for the iOS and MacOs classes. C++ for the Windows class.
For putting them together, you should use Unity's directive to do that.
class TextToSpeech
{
#if UNITY_ANDROID
Use TextToSpeech class
#endif
#if UNITY_IOS
Use AVSpeechSynthesizer class
#endif
#if UNITY_STANDALONE_OSX || UNITY_EDITOR_OSX
Use NSSpeechSynthesizer class
#endif
#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
Use ISpVoice class
#endif
}
I'm following this tutorial from Microsoft to use a Portable Class Library in a Windows Phone 8.1 WinRT Project. At the end they show an example in WPF.
It works well with WPF, you can use a class from the external library in the xaml for example to set the d:DataContext property of the window.
However with Windows Phone app, after adding the namespace alias in xaml, intellisense won't find the classes, and compiler insults me.
I found a workaround by creating dummy classes in the app project namespace, like this:
namespace App
{
public class dummyClass : externalLibrary.externalClass
{}
}
Using this, intellisense works.
Any idea how to fix this?