Cannot install Visual Studio C# NuGet package

Question

I'm writing a Unity app, and i keep experiencing game engine freeze when I use LoadImage on a large JPG, so i decide to try to decode the JPG image on a thread (so as not to freeze the main thread by decoding the JPG on the main thread which is my theory as to why the freeze is happenning).

The plan is, after the thread decodes the JPG, use the main thread to call LoadRawImageData to load the decoded image data into a texture, which should be fast since it doesnt have to decode anything.

To do all that i need to find a JPG decoder package, so in the Visual Studio NuGet package manager i saw the package "LibJpeg.NET" which claims to have no dependencies, but when i try to install the package in my Visual Studio Unity project which uses .Net 3.5 i get the Nuget error

Could not install package 'LibJpeg.NET-ts 2.0.1'. You are trying to install this package into a project that targets '.NETFramework,Version=v3.5', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

Anybody knows how to solve this, or maybe anybody knows another free .NET 3.5 compatible cross platform (Windows/Mac/iOS/Android) JPEG decoder package i can use on a thread in Unity to decode a JPG?

You could look at ImageMagick packages - i remember using them 10 years ago — Piotr Kula
– Piotr Kula, Commented Mar 1, 2019 at 16:29

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

If you check the nuget package page, it says that you cannot install it if your application targets any version lower than .Net framework 4.

Supported platforms .NET 4 and higher, Windows 8 and higher, Windows Phone Silverlight 8 and 8.1, Windows Phone 8.1 and higher, Silverlight 5, Xamarin Android, Xamarin iOS (Classic and Unified API). The package also includes an assembly for .NET Core, Standard Library 1.0.

If you want your project to be used on windows / linux / max, then it should be targetting to .net standard (i.e. .Net core ) version.

Once you target to .net standard, you would be either able to use same package or you would be able to use some other libraries e.g. BitMiracle.LibJpeg.NET OR libjpeg-turbo-net

Hope this helps.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Mar 1, 2019 at 16:27

Manoj Choudhari

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6 Comments

programmer3 Over a year ago

oh right, i see that now. Thanks! So a unity app can target the .net standard also?

NibblyPig Over a year ago

If you pick an older version of the library, there are no dependencies, so just select an older version in the nuget browser such as 1.5.0.1

programmer3 Over a year ago

Thanks for the suggestion, but Its very strange that it only shows version 2.0.1, no other version is shown in the NUGET dialog box for libjpeg.net

Manoj Choudhari Over a year ago

Unity targets to .net core. Please refer this blog for more details - loekvandenouweland.com/content/…

Heretic Monkey Over a year ago

.NET Framework 4.7.2 conforms to .NET Standard 2.0 also, not just .NET Core. so you may want to remove the "(i.e. .Net core framework)"...

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