Read image files in a Docker container

GemBox.Imaging is a cross-platform imaging library for .NET so you can use it inside docker containers that are running .NET Docker images. To run this example locally, you must first install Docker Desktop.

Visual Studio container tool for adding Docker to existing .NET Core project — Screenshot of Visual Studio container tool

The following code presents a project file for the .NET Core application with added Docker support.

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
    <DockerfileContext>.</DockerfileContext>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="GemBox.Imaging" Version="*" />
    <PackageReference Include="SkiaSharp.NativeAssets.Linux" Version="*" />
  </ItemGroup>

</Project>

To configure or customize a Docker image, you'll need to edit the Dockerfile.

The example below shows how you can read image files from Docker containers and configure Docker images with Dockerfile.

Dockerfile
C#
VB.NET

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FROM mcr.microsoft.com/dotnet/runtime:8.0 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY ["ImagingDocker.csproj", ""]
RUN dotnet restore "./ImagingDocker.csproj"
COPY . .
WORKDIR "/src/."
RUN dotnet build "ImagingDocker.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "ImagingDocker.csproj" -c Release -o /app/publish /p:UseAppHost=false

FROM base AS final

WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "ImagingDocker.dll"]

using GemBox.Imaging;
using System;

class Program
{
    static void Main()
    {
        ComponentInfo.SetLicense("FREE-LIMITED-KEY");
        
        using (var image = Image.Load("FragonardReader.jpg"))
        {
            // Display image information.
            Console.WriteLine($"Image size: {image.Width}x{image.Height}");
        }
    }
}

Imports GemBox.Imaging
Imports System

Module Program

    Sub Main()

        ComponentInfo.SetLicense("FREE-LIMITED-KEY")

        Using image As Image = Image.Load("FragonardReader.jpg")
            ' Display image information.
            Console.WriteLine($"Image size: {image.Width}x{image.Height}")
        End Using

    End Sub

End Module

Next steps

GemBox.Imaging is a .NET component that provides an easy way to load, edit, save images. GemBox.Imaging also supports file format conversions and image transformations (resize, crop, rotate and flip).

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Read image files in a Docker container

See also

Next steps