public void LinkedFiles()
{
// We want to assert that if the open document is linked into multiple projects, we
// update all documents at the same time with the changed text. Otherwise things will get
// out of sync.
var exportProvider = TestExportProvider.MinimumExportProviderFactoryWithCSharpAndVisualBasic.CreateExportProvider();
using var workspace = new AdhocWorkspace();
var textBufferFactoryService = exportProvider.GetExportedValue <ITextBufferFactoryService>();
var buffer = textBufferFactoryService.CreateTextBuffer("Hello", textBufferFactoryService.TextContentType);
var sourceTextContainer = buffer.AsTextContainer();
// We're going to add two projects that both consume the same file
const string FilePath = "Z:\\Foo.cs";
var documentIds = new List <DocumentId>();
for (var i = 0; i < 2; i++)
{
var projectId = workspace.AddProject($"Project{i}", LanguageNames.CSharp).Id;
var documentId = DocumentId.CreateNewId(projectId);
workspace.AddDocument(DocumentInfo.Create(documentId, "Foo.cs", filePath: FilePath));
workspace.OnDocumentOpened(documentId, sourceTextContainer);
documentIds.Add(documentId);
}
// Confirm the files have been linked by file path. This isn't the core part of this test but without it
// nothing else will work.
Assert.Equal(documentIds, workspace.CurrentSolution.GetDocumentIdsWithFilePath(FilePath));
Assert.Equal(new[] { documentIds.Last() }, workspace.CurrentSolution.GetDocument(documentIds.First()).GetLinkedDocumentIds());
// Now the core test: first, if we make a modified version of the source text, and attempt to get the document for it,
// both copies should be updated.
var originalSnapshot = buffer.CurrentSnapshot;
buffer.Insert(5, ", World!");
var newDocumentWithChanges = buffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChanges();
// Since we're calling this on the current snapshot and we observed the text edit synchronously,
// no forking actually should have happened.
Assert.Same(workspace.CurrentSolution, newDocumentWithChanges.Project.Solution);
Assert.Equal("Hello, World!", newDocumentWithChanges.GetTextSynchronously(CancellationToken.None).ToString());
Assert.Equal("Hello, World!", newDocumentWithChanges.GetLinkedDocuments().Single().GetTextSynchronously(CancellationToken.None).ToString());
// Now let's fetch back for the original snapshot. Both linked copies should be updated.
var originalDocumentWithChanges = originalSnapshot.GetOpenDocumentInCurrentContextWithChanges();
Assert.NotSame(workspace.CurrentSolution, originalDocumentWithChanges.Project.Solution);
Assert.Equal("Hello", originalDocumentWithChanges.GetTextSynchronously(CancellationToken.None).ToString());
Assert.Equal("Hello", originalDocumentWithChanges.GetLinkedDocuments().Single().GetTextSynchronously(CancellationToken.None).ToString());
}