CODEWITHSUNDEEP
asp.net-corenugetsystem.drawingasp.net-core-3.0
RonC
RonC

Reputation: 33879

How to access System.Drawing ie System.Drawing.Common in Asp.Net Core 3

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:

enter image description here

My Project shows these dependencies:

enter image description here

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?

Upvotes: 16

Views: 16593

Answers (1)

Chris Pratt
Chris Pratt

Reputation: 239430

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.

Upvotes: 22

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