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I have an <http://ASP.NET|ASP.NET> application which has a Docker File and am trying to create the Docker Image using Pulumi.  When I specify the Docker.ImageArgs, I can set the Build to the relative path of the directory where the Docker File is located.  However, I need to pass the working directory to Docker.  I am currently doing the following when using Docker build:

docker build -f ./Dockerfile [/working_directory_path]

When using Pulumi (C#), I am doing something like:
            var image = new Docker.Image("app-img", new Docker.ImageArgs
            {
                Build = "../path_to/directory_of_docker_file",
                ImageName = appRepo.RepositoryUrl,
                Registry = new Docker.ImageRegistry
                {
                    Server = appRepo.RepositoryUrl,
                    Username = appRepoCredentials.GetAt(0),
                    Password = appRepoCredentials.GetAt(1)
                },
            });

However I need to be able to specify the working directory for the docker file (in a similar way to when using docker build).  Does anyone know how to achieve this with the C# API?

I managed to solve this one myself.  For anyone else with the same issue, instead of using a string for Build which is set to the directory containing the Dockerfile, instead use the following:

Build = new Docker.DockerBuild()
{
    Context = "../relative_path_of_directory_you_want_to_be_provided_to_the_dockerfile",
    Dockerfile = "../path_to_docker_directory/Dockerfile"
}