c# - 仅在 Visual Studio 中调试时出现 Automapper 性能问题

Question

在我的 WPF 应用程序中，我使用 AutoMapper 从实体映射到域对象。

对于一个特定的映射，我发现使用调试 (F5) 与不使用 (CTRL + F5) 运行应用程序时速度明显变慢。如果不调试，此映射需要 < 1 秒，但调试需要约 14 秒。

域对象(为简洁起见进行了简化):

public class CompanyModel : UpdateableModel
{
    public CompanyModel() : this(true){}

    public CompanyModel(bool isNewModel) : base(isNewModel)
    {
        Projects = new ObservableCollectionEx<ProjectModel>();
        Projects.ItemPropertyChanged += (sender, args) => OnPropertyChanged("Projects");
    }

    public int? Id { get; set;}
    public string Name { get; set; }
    public string CompanyXref { get; set; }
    public bool IsActive { get; set; }
    public ObservableCollectionEx<ProjectModel> Projects { get; set;}
    public DateTime? DateUpdated { get; set;}
}

public class ProjectModel : UpdateableModel
{
    public ProjectModel() : this(true){}

    public ProjectModel(bool isNewModel) : base(isNewModel)
    {
        Tasks = new ObservableCollectionEx<ProjectTaskModel>();

        SetPropertyDefault(() => StartDate, DateTime.Today);
        SetPropertyDefault(() => EndDate, DateTime.Today);

        // ReSharper disable once ExplicitCallerInfoArgument
        Tasks.ItemPropertyChanged += (sender, args) => OnPropertyChanged("Tasks");
    }

    public int? Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
    public string BillingCurrency { get; set; }
    public string ExternalXref { get; set; }
    public bool IsChargeable { get; set; }        
    public bool IsActive { get; set; }
    public int TimeTypeId { get; set; }
    public ObservableCollectionEx<ProjectTaskModel> Tasks { get; set;}
    public DateTime? DateUpdated { get; set; }
}

public class ProjectTaskModel : UpdateableModel
{
    public ProjectTaskModel() : this(true){}

    public ProjectTaskModel(bool isNewModel) : base(isNewModel)
    {
        SetPropertyDefault(() => StartDate, DateTime.Today);
        SetPropertyDefault(() => EndDate, DateTime.Today);
    }

    public int? Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public DateTime StartDate { get; set; }        
    public DateTime EndDate { get; set; }
    public string ExternalXref { get; set; }
    public bool IsActive { get; set; }
    public DateTime? DateUpdated { get; set; }
}

实体:

public class CompanyEntity : BaseEntity
{
    public virtual string CompanyName { get; set; }
    public virtual string CompanyXref { get; set; }
    public virtual bool IsActive { get; set; }
    public virtual IList<ProjectEntity> Projects { get; set; }

    public virtual DateTime? DateUpdated { get; set; }
}

public class ProjectEntity : BaseEntity
{
    public virtual string ProjectName { get; set; }
    public virtual string Description { get; set; }
    public virtual DateTime StartDate { get; set; }
    public virtual DateTime EndDate { get; set; }
    public virtual string ExternalXref { get; set; }
    public virtual bool IsChargeable { get; set; }
    public virtual bool IsActive { get; set; }

    public virtual int TimeTypeId { get; set; }
    public virtual string CurrencyId { get; set; }

    public virtual CompanyEntity ClientCompany { get; set; }
    public virtual DateTime? DateUpdated { get; set; }

    public virtual IList<ProjectTaskEntity> Tasks { get; set; }
}

public class ProjectTaskEntity : BaseEntity
{
    public virtual string ProjectTaskName { get; set; }
    public virtual string Description { get; set; }
    public virtual DateTime StartDate { get; set; }
    public virtual DateTime EndDate { get; set; }
    public virtual string ExternalXref { get; set; }
    public virtual bool IsActive { get; set; }

    public virtual DateTime? DateUpdated { get; set; }

    public virtual ProjectEntity Project { get; set; }
}

最后是映射，所有属性当前都已显式映射:

CreateMap<CompanyEntity, CompanyModel>()
    .ConstructUsing((CompanyEntity src) => new CompanyModel(false))
    .MapMember(dest => dest.Id, src => src.Id)
    .MapMember(dest => dest.Name, src => src.CompanyName)
    .MapMember(dest => dest.CompanyXref, src => src.CompanyXref)
    .MapMember(dest => dest.IsActive, src => src.IsActive)
    .MapMember(dest => dest.Projects, src => src.Projects)
    .IgnoreMember(dest => dest.State);

CreateMap<ProjectEntity, ProjectModel>()
    .ConstructUsing((ProjectEntity src) => new ProjectModel(false))
    .MapMember(dest => dest.Id, src => src.Id)
    .MapMember(dest => dest.Name, src => src.ProjectName)
    .MapMember(dest => dest.Description, src => src.Description)
    .MapMember(dest => dest.BillingCurrency, src => src.CurrencyId)
    .MapMember(dest => dest.StartDate, src => src.StartDate)
    .MapMember(dest => dest.EndDate, src => src.EndDate)
    .MapMember(dest => dest.ExternalXref, src => src.ExternalXref)
    .MapMember(dest => dest.IsActive, src => src.IsActive)
    .MapMember(dest => dest.IsChargeable, src => src.IsChargeable)
    .MapMember(dest => dest.Tasks, src => src.Tasks)
    .MapMember(dest => dest.TimeTypeId, src => src.TimeTypeId)
    .IgnoreMember(dest => dest.State);

CreateMap<ProjectTaskEntity, ProjectTaskModel>()
    .ConstructUsing((ProjectTaskEntity src) => new ProjectTaskModel(false))
    .MapMember(dest => dest.Id, src => src.Id)
    .MapMember(dest => dest.Name, src => src.ProjectTaskName)
    .MapMember(dest => dest.Description, src => src.Description)
    .MapMember(dest => dest.StartDate, src => src.StartDate)
    .MapMember(dest => dest.EndDate, src => src.EndDate)
    .MapMember(dest => dest.ExternalXref, src => src.ExternalXref)
    .MapMember(dest => dest.IsActive, src => src.IsActive)
    .IgnoreMember(dest => dest.State);

映射时有16家公司，122个项目，每个项目目前只有一个任务。

我确实尝试忽略映射上的各种属性，这似乎是项目级别的任务集合导致的；忽略它，映射需要 2 秒而不是 14 秒。

是否有关于 Visual Studio 如何托管应用程序进行调试的内容可能会导致此性能问题？

Answer 1

您可以下载一个备用的 CSharp IDE，在那里以 Debug模式运行它，看看是否存在差异。SharpDev 是一个非常好的开源 IDE，支持 C# 项目。

http://www.icsharpcode.net/OpenSource/SD/Download/

这至少会是一种有趣且简单的尝试替代方法的方法。SharpDev 还内置了一个代码分析器，可以指出问题所在。

祝你好运。