.Net Core 无法使用位图

Question

I am working on a Web Service using .Net Core 2.1.

I have a byte array containing all pixels values (in grey scale), a width, a height. I want to create a bitmap from theses parameters.

There is my code (from a working .Net Framework 4 project) :

public FileResult PostSealCryptItem(Byte[] matrix, int width, int height)
{
    Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
    for (int y = 0; y < height; y++)
        for (int x = 0; x < width; x++)
            bmp.SetPixel(x, y, Color.FromArgb(ToArgb(matrix, x, y)));

    Byte[] data = BitmapToByteArray(bmp);
    FileContentResult result = new FileContentResult(data , "image/png");

    return result;
}

But in .NET Core, I've the error :

The type or namespace name 'Bitmap' could not be found (are you missing a using directive or an assembly reference?)

I've try to add reference to System.Drawing but it did not work.

Answer 1

Install Nuget Package System.Drawing.Common

It is no longer included with .net core and must be added manually.

Answer 2

You can use ImageSharp instead of System.Drawing

https://github.com/SixLabors/ImageSharp

Nuget console

Install-Package SixLabors.ImageSharp -Version 1.0.0-beta0005

Answer 3

Aspose.Drawing is a drop-in cross-platform replacement for System.Drawing. The library is fully managed and supports Web Services using .Net Core 2.1. (I'm one of the developers.)

Answer 4

有一个 NuGet 包而不是 System.Drawing，你可以使用它

Install-Package System.Drawing.Common

Answer 5

这个对我dotnet add package System.Drawing.Common --version 5.0.3