仅当在Visual Studio中调试时，Automapper性能问题

Question

在WPF应用程序中，我正在使用AutoMapper将实体映射到域对象。

对于一个特定的映射，在运行带有调试（F5）而不运行（CTRL + F5）的应用程序时，我发现运行速度大大降低。 如果不调试，此映射将花费不到1秒的时间，但是如果进行调试，则需要花费约14秒的时间。

域对象（为简便起见简化）：

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，映射，当前已显式映射所有属性：

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);

执行映射时，有16个公司，总共122个项目，并且每个项目当前只有一个任务。

我确实尝试忽略了映射上的各种属性，而这似乎是导致此问题的项目级别的Tasks集合。 忽略它，映射将花费2秒而不是14秒。

关于Visual Studio如何托管应用程序进行调试，这可能会导致此性能问题吗？

Answer 1

您可以下载替代的CSharp IDE，在其中以调试模式运行它，看看是否存在差异。 SharpDev是一个非常好的开源IDE，它支持C＃项目。

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

至少这是一种有趣且简单的尝试替代方法。 SharpDev还内置有代码分析器，可以指示问题所在。

祝好运。