C
C#•2mo ago
VoidPointer

Avoid a Build Every Time I Call MSBuildWorkspace.OpenSolutionAsync

I'm working on an app to help me do some analysis or querying of a codebase, using the Microsoft.CodeAnalysis features. I start out like this: 
  public async Task<SolutionModule> OpenSolutionAsync(string solutionFilePath)
  {
    var workspace = ConfigureWorkspace();
    var solution = await workspace.OpenSolutionAsync(solutionFilePath);
    var solutionModule = new SolutionModule(solution);
    var projIds = solution.Projects
        .Where(p => p.Language == LanguageNames.CSharp && !string.IsNullOrWhiteSpace(p.FilePath))
        .Select(p => p.Id);
    foreach (var id in projIds)
    {
        var csproj = solution.GetProject(id);
    ...
  public async Task<SolutionModule> OpenSolutionAsync(string solutionFilePath)
  {
    var workspace = ConfigureWorkspace();
    var solution = await workspace.OpenSolutionAsync(solutionFilePath);
    var solutionModule = new SolutionModule(solution);
    var projIds = solution.Projects
        .Where(p => p.Language == LanguageNames.CSharp && !string.IsNullOrWhiteSpace(p.FilePath))
        .Select(p => p.Id);
    foreach (var id in projIds)
    {
        var csproj = solution.GetProject(id);
    ...
Then I loop through each document in each project, each class in each document, and each method in each class. My issue that something invokes a build of the solution at solutionFilePath every time I run the app, and I would like to avoid this. My worst solition so far is saving my output in a cache json file, and when I run the app, if that file is recent enough, just deserialize it instead of calling my OpenSolutionAsync method. I'm hoping the workspace or solution objects have a setting or something that Roslyn judges for itself whether to build again or not, and not my rudimentary caching solution.
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