问题
Program.cs(1,14): error CS0234: The type or namespace name 'Drawing' does not exist in the namespace 'System' (are you missing an assembly reference?
Is it possible to fix that? or I am not meant to be using this lib, if I am developing in Linux with C#?
回答1:
The System.Drawing namespace is at the moment not part of corefx as it relies on the GDI+ features from Windows.
But there are plans to support it in the future.
But there are multiple alternatives:
CoreCompat.System.Drawing
CoreCompat.System.Drawing is a .NET Core port of the Mono implementation of System.Drawing. Like System.Drawing in .NET Framework and in Mono, CoreCompat.System.Drawing also relies on GDI+ on Windows. Caution is therefore advised, for the same reasons.
ImageSharp
ImageSharp is a brand new, pure managed code, and cross-platform image processing library. Its performance is not as good as that of libraries relying on native OS-specific dependencies, but it remains very reasonable. Its only dependency is .NET itself, which makes it extremely portable: there is no additional package to install, just reference ImageSharp itself, and you’re done.
Magick.NET
Magick.NET is the .NET wrapper for the popular ImageMagick library. ImageMagick is an open-source, cross-platform library that focuses on image quality, and on offering a very wide choice of supported image formats. It also has the same support for EXIF as ImageSharp.
(The .NET Core build of Magick.NET currently only supports Windows.)
SkiaSharp
SkiaSharp is the .NET wrapper for Google’s Skia cross-platform 2D graphics library, that is maintained by the Xamarin team. SkiaSharp is now compatible with .NET Core, and is extremely fast.
FreeImage-dotnet-core
This library is to the native FreeImage library what Magick.NET is to ImageMagick: a .NET Core wrapper. It offers a nice choice of image formats, good performance, and good visual quality.
Here are some good examples and performance analyses of the libraries mentioned above.
来源：https://stackoverflow.com/questions/44428405/i-am-using-net-core-with-c-sharp-on-linux-lib-system-drawing-is-missing