如何获得解决方案中的所有项目名称？

选中此MSDN，它将解决您的查询。

.sln文件包含环境用于查找和加载持久数据及其引用的项目VSPackages的名称-值参数的基于文本的信息。当用户打开解决方案时，环境会循环浏览.sln文件中的preSolution，Project和postSolution信息，以加载解决方案，解决方案中的项目以及与解决方案相关的所有持久性信息。

还要检查EnvDTE：获取所有项目。

还要检查此主题（对John Leidegren的感谢，因为他提供了很好的答案）

public class Solution
{
    //internal class SolutionParser
    //Name: Microsoft.Build.Construction.SolutionParser
    //Assembly: Microsoft.Build, Version=4.0.0.0

    static readonly Type s_SolutionParser;
    static readonly PropertyInfo s_SolutionParser_solutionReader;
    static readonly MethodInfo s_SolutionParser_parseSolution;
    static readonly PropertyInfo s_SolutionParser_projects;

    static Solution()
    {
        s_SolutionParser = Type.GetType("Microsoft.Build.Construction.SolutionParser, Microsoft.Build, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", false, false);
        if (s_SolutionParser != null)
        {
            s_SolutionParser_solutionReader = s_SolutionParser.GetProperty("SolutionReader", BindingFlags.NonPublic | BindingFlags.Instance);
            s_SolutionParser_projects = s_SolutionParser.GetProperty("Projects", BindingFlags.NonPublic | BindingFlags.Instance);
            s_SolutionParser_parseSolution = s_SolutionParser.GetMethod("ParseSolution", BindingFlags.NonPublic | BindingFlags.Instance);
        }
    }

    public List<SolutionProject> Projects { get; private set; }

    public Solution(string solutionFileName)
    {
        if (s_SolutionParser == null)
        {
            throw new InvalidOperationException("Can not find type 'Microsoft.Build.Construction.SolutionParser' are you missing a assembly reference to 'Microsoft.Build.dll'?");
        }
        var solutionParser = s_SolutionParser.GetConstructors(BindingFlags.Instance | BindingFlags.NonPublic).First().Invoke(null);
        using (var streamReader = new StreamReader(solutionFileName))
        {
            s_SolutionParser_solutionReader.SetValue(solutionParser, streamReader, null);
            s_SolutionParser_parseSolution.Invoke(solutionParser, null);
        }
        var projects = new List<SolutionProject>();
        var array = (Array)s_SolutionParser_projects.GetValue(solutionParser, null);
        for (int i = 0; i < array.Length; i++)
        {
            projects.Add(new SolutionProject(array.GetValue(i)));
        }
        this.Projects = projects;
    }
}

[DebuggerDisplay("{ProjectName}, {RelativePath}, {ProjectGuid}")]
public class SolutionProject
{
    static readonly Type s_ProjectInSolution;
    static readonly PropertyInfo s_ProjectInSolution_ProjectName;
    static readonly PropertyInfo s_ProjectInSolution_RelativePath;
    static readonly PropertyInfo s_ProjectInSolution_ProjectGuid;

    static SolutionProject()
    {
        s_ProjectInSolution = Type.GetType("Microsoft.Build.Construction.ProjectInSolution, Microsoft.Build, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", false, false);
        if (s_ProjectInSolution != null)
        {
            s_ProjectInSolution_ProjectName = s_ProjectInSolution.GetProperty("ProjectName", BindingFlags.NonPublic | BindingFlags.Instance);
            s_ProjectInSolution_RelativePath = s_ProjectInSolution.GetProperty("RelativePath", BindingFlags.NonPublic | BindingFlags.Instance);
            s_ProjectInSolution_ProjectGuid = s_ProjectInSolution.GetProperty("ProjectGuid", BindingFlags.NonPublic | BindingFlags.Instance);
        }
    }

    public string ProjectName { get; private set; }
    public string RelativePath { get; private set; }
    public string ProjectGuid { get; private set; }

    public SolutionProject(object solutionProject)
    {
        this.ProjectName = s_ProjectInSolution_ProjectName.GetValue(solutionProject, null) as string;
        this.RelativePath = s_ProjectInSolution_RelativePath.GetValue(solutionProject, null) as string;
        this.ProjectGuid = s_ProjectInSolution_ProjectGuid.GetValue(solutionProject, null) as string;
    }
}