C# 解决方案中的Visual Studio 2017扩展性项目计数

我有两个Visual Studio解决方案，比如SolutionOne和Solution2，如下所示：

SolutionOne

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
VisualStudioVersion = 15.0.26403.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{2408EC7B-2E06-46A5-B6AC-D4E985E30CBB}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{DFF21B2A-7F52-448D-8867-D1C4EEAF73A7}"
EndProject
Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Clients", "Clients", "{BABF1C97-CB5C-4AC5-81C6-6A81B0D45E27}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Api", "src\Api\Api.csproj", "{7059F655-BBD7-4CA3-9A76-2FF198996DA8}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Client", "src\Client\Client.csproj", "{B707F1AF-DD46-45D6-B4C5-BC2E9A3FB9B7}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ResourceOwnerClient", "src\ResourceOwnerClient\ResourceOwnerClient.csproj", "{40674C67-6A97-4B85-8154-92AEC74A37A0}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MvcClient", "src\MvcClient\MvcClient.csproj", "{4CFB4883-9929-4814-BE22-2E19476CE4A3}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IdentityServerWithAspNetIdentity", "src\IdentityServerWithAspNetIdentity\IdentityServerWithAspNetIdentity.csproj", "{1ECB5581-FFA5-4C11-A491-C85ABD962033}"
EndProject

解决方案二

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
VisualStudioVersion = 15.0.26403.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebApplication1", "WebApplication1\WebApplication1.csproj", "{C495AA01-06E7-47A1-B5A4-97352C689596}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ClassLibrary1", "ClassLibrary1\ClassLibrary1.csproj", "{250ABB36-7C50-48BC-AEC7-7B0EA549C277}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp1", "ConsoleApp1\ConsoleApp1.csproj", "{9C73E333-1C3D-4BB4-91B6-2C1C73BFB726}"
EndProject

**注：为简洁起见，删除了两种解决方案中的“全局”部分

我正在尝试使用以下代码从这两个解决方案中获取项目详细信息

    private void MenuItemCallback(object sender, EventArgs e)
    {
        var dte = Package.GetGlobalService(typeof(DTE)) as DTE2;
        Solution2 sln = dte.Solution as Solution2;

        string msg = string.Empty;
        foreach (Project prop in sln.Projects)
        {
            msg += prop.Name  +"\n";
        }
        MessageBox.Show(msg);
    }

上述代码的输出用于

SolutionOne是：

• src
• 解决方案项

解决方案二是：

• WebApplication1
• 班级图书馆1
• 控制台AP1

---

我这里的问题是，尽管SolutionOne有5个项目，但它并没有捕获所有这5个项目，而是在输出中只提供了两个解决方案文件夹。为什么会这样？它只是捕获一级项目吗？

解决方案的项目结构是递归的，而不是线性的，因为可能存在解决方案文件夹（建模为EnvDTE.project），而这些文件夹又包含其他解决方案文件夹或项目。请参见如何在此处导航的示例：