// Based on MSBuild.exe's restore logic when using /restore. https://github.com/Microsoft/msbuild/blob/master/src/MSBuild/XMake.cs#L1242
private static BuildResult ExecuteRestore(ProjectInstance projectInstance, BuildManager buildManager)
{
const string UniqueProperty = "MSBuildRestoreSessionId";
// Set a property with a random value to ensure that restore happens under a different evaluation context
// If the evaluation context is not different, then projects won't be re-evaluated after restore
projectInstance.SetProperty(UniqueProperty, Guid.NewGuid().ToString("D", CultureInfo.InvariantCulture));
// Create a new request with a Restore target only and specify:
// - BuildRequestDataFlags.ClearCachesAfterBuild to ensure the projects will be reloaded from disk for subsequent builds
// - BuildRequestDataFlags.SkipNonexistentTargets to ignore missing targets since Restore does not require that all targets exist
// - BuildRequestDataFlags.IgnoreMissingEmptyAndInvalidImports to ignore imports that don't exist, are empty, or are invalid because restore might
// make available an import that doesn't exist yet and the <Import /> might be missing a condition.
var request = new BuildRequestData(
projectInstance,
targetsToBuild: RestoreTargets,
hostServices: null,
flags: BuildRequestDataFlags.ClearCachesAfterBuild | BuildRequestDataFlags.SkipNonexistentTargets | BuildRequestDataFlags.IgnoreMissingEmptyAndInvalidImports);
var result = ExecuteBuild(buildManager, request);
// Revert the property
projectInstance.RemoveProperty(UniqueProperty);
return(result);
}
