How to build in parallel with Microsoft.Build.Execution.BuildManager?

Question

I am trying to use the MsBuild api to run a build frpm C#. The following seems to work, but only runs the build single threaded. I really need this to run multi-threaded. When I run from the command line by running msbuild I can use the /m switch to start a parallel build. How can I achieve the same programmatically?

            var logger = new BasicLogger();

            var buildParameters = new BuildParameters()
            {
                Loggers = new List<Microsoft.Build.Framework.ILogger>() { logger },
                DetailedSummary = false,
                EnableNodeReuse = false,
                OnlyLogCriticalEvents = false,
                ShutdownInProcNodeOnBuildFinish = true
            };

            var globalProperties = new Dictionary<string, string>
            {
                { "Platform", platform },
                { "Configuration", configuration },
                { "BuildInParallel", "True" } // guessed at this, doesn't seem to have an effect
            };

            var targets = new string[] { target };

            var buildRequestData = new BuildRequestData(projectFileName, globalProperties, "15.0", targets, null);
            BuildManager.DefaultBuildManager.ResetCaches();

            var buildResult = BuildManager.DefaultBuildManager.Build(buildParameters, buildRequestData);

I've seen this: social.msdn.microsoft.com/Forums/vstudio/en-US/… — Scott Langham
– Scott Langham, Commented Nov 29, 2017 at 9:46

Rainer Sigwald · Accepted Answer · 2020-02-25 15:43:21Z

1

The API mechanism to specify that builds should be attempted in parallel when possible is BuildParameters.MaxNodeCount.

To mimic the default behavior of msbuild.exe -m, you might want to specify "as many processes as the machine has logical processors:


            var buildParameters = new BuildParameters()
            {
                Loggers = new List<Microsoft.Build.Framework.ILogger>() { logger },
                DetailedSummary = false,
                EnableNodeReuse = false,
                MaxNodeCount = System.Environment.ProcessorCount,
                OnlyLogCriticalEvents = false,
                ShutdownInProcNodeOnBuildFinish = true
            };

answered Feb 25, 2020 at 15:43

Rainer Sigwald

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