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lang: ja-jp
breaks: true
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# `VSIX` で、 ソリューションが開かれたイベントを取得する方法 2022-01-26

    [PackageRegistration(UseManagedResourcesOnly = true, AllowsBackgroundLoading = true)]
    [Guid(VSIXProject19Package.PackageGuidString)]
    public sealed class VSIXProject19Package : AsyncPackage
    {
        /// <summary>
        /// VSIXProject19Package GUID string.
        /// </summary>
        public const string PackageGuidString = "08490e99-c061-4fa0-88d0-00684788af8c";

        #region Package Members

        /// <summary>
        /// Initialization of the package; this method is called right after the package is sited, so this is the place
        /// where you can put all the initialization code that rely on services provided by VisualStudio.
        /// </summary>
        /// <param name="cancellationToken">A cancellation token to monitor for initialization cancellation, which can occur when VS is shutting down.</param>
        /// <param name="progress">A provider for progress updates.</param>
        /// <returns>A task representing the async work of package initialization, or an already completed task if there is none. Do not return null from this method.</returns>
        protected override async Task InitializeAsync(CancellationToken cancellationToken, IProgress<ServiceProgressData> progress)
        {
            // When initialized asynchronously, the current thread may be a background thread at this point.
            // Do any initialization that requires the UI thread after switching to the UI thread.
            //await this.JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);

            bool isSolutionLoaded = await IsSolutionLoadedAsync(cancellationToken);

            if (isSolutionLoaded)
            {
                HandleOpenSolution();
            }

            // Listen for subsequent solution events
            SolutionEvents.OnAfterOpenSolution += HandleOpenSolution;

            SolutionEvents.OnAfterLoadProject += SolutionEvents_OnAfterLoadProject;
            SolutionEvents.OnAfterBackgroundSolutionLoadComplete += SolutionEvents_OnAfterBackgroundSolutionLoadComplete;
            SolutionEvents.OnAfterLoadAllDeferredProjects += SolutionEvents_OnAfterLoadAllDeferredProjects;
        }

        #endregion

        private void SolutionEvents_OnAfterLoadAllDeferredProjects(object sender, EventArgs e)
        {
            Debug.WriteLine($"SolutionEvents_OnAfterLoadAllDeferredProjects");
        }

        private void SolutionEvents_OnAfterBackgroundSolutionLoadComplete(object sender, EventArgs e)
        {
            Debug.WriteLine($"SolutionEvents_OnAfterBackgroundSolutionLoadComplete");
        }

        private void SolutionEvents_OnAfterLoadProject(object sender, LoadProjectEventArgs e)
        {
            Debug.WriteLine($"SolutionEvents_OnAfterLoadProject {e.ToString()}");
        }

        private async Task<bool> IsSolutionLoadedAsync(CancellationToken cancellationToken)
        {
            await JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);
            var solService = await GetServiceAsync(typeof(SVsSolution)) as IVsSolution;

            ErrorHandler.ThrowOnFailure(solService.GetProperty((int)__VSPROPID.VSPROPID_IsSolutionOpen, out object value));

            return value is bool isSolOpen && isSolOpen;
        }

        private void HandleOpenSolution(object sender = null, EventArgs e = null)
        {
            // Handle the open solution and try to do as much work
            // on a background thread as possible
            Debug.WriteLine($"HandleOpenSolution");
        }

    }

###### tags: `VSIX` `AsyncPackage` `SolutionEvents`