Zan Person's questions

有 2 个全局变量。controlDisable 变量绑定到窗口元素的 IsEnabled 属性。：

private bool completedLogin = true;
    public bool CompletedLogin
    {
        get
        {
            return completedLogin;
        }
        set
        {
            completedLogin = value;
            NotifyPropertyChanged();
        }
    }

private bool controlDisable = true;
    public bool ControlDisable
    {
        get
        {
            return controlDisable;
        }
        set
        {
            controlDisable = value;
            NotifyPropertyChanged();
        }
    }

有一个方法是在另一个线程中单击按钮时执行的（使用的是 BackgroundWorker 类）：

 private RelayCommand loginCommand;

    public RelayCommand LoginCommand
    {
        get
        {
            return loginCommand ??
              (loginCommand = new RelayCommand(obj =>
              {
                  ControlDisable = false;
                  CompletedLogin = false;
                  Password = GetPassword(obj);
                  worker = new BackgroundWorker();
                  worker.DoWork += (obj, ea) => LoginUser();
                  worker.RunWorkerAsync();
                  worker.RunWorkerCompleted += (obj, ea) => OpenGeneral();
              }));
        }
    }

private async void LoginUser()
    {
        if (Login != "" && Password != "")
        {
            using (MSGCoreContext db = new MSGCoreContext())
            {
                user = await db.Users.FirstOrDefaultAsync(u => u.Login == Login);

                if (user != null)
                {
                    userId = user.UserId;
                    userRole = user.Role;

                    if (PBKDF2HashHelper.VerifyPassword(Password, user.Password))
                    {
                        CompletedLogin = true;
                    }
                    else { Warning = "Неверный логин или пароль!"; CompletedLogin = false; ControlDisable = true; }
                }
                else { Warning = "Пользователь не существует!"; CompletedLogin = false; ControlDisable = true; }
            }
        }
        else
        {
            Warning = "Заполните все поля!";
            CompletedLogin = false;
            ControlDisable = true;
        }
    }

在 LoginUser 方法完成执行后，会触发 RunWorkerCompleted 事件，该事件会调用 OpenGeneral 方法：

private void OpenGeneral()
    {
        if (CompletedLogin)
        {
            var displayRootRegistry = (Application.Current as App).displayRootRegistry;
            var dialogWindowViewModel = new GeneralViewModel(Login, userRole);
            displayRootRegistry.ShowPresentation(dialogWindowViewModel);
            Application.Current.MainWindow.Close();
        }
    }

ControlDisable 值已更改，窗口中的元素设置为 IsEnabled = false 状态。而且 OpenGeneral 方法中 CompletedLogin 变量的值总是假的，我怎样才能让 CompletedLogin 的值也改变呢？

MS SQL Server 中有 2 个表。你需要得到这样的树视图：

我正在使用实体框架从表中获取数据。上下文代码：

public partial class MSGContext : DbContext
{
    public MSGContext()
        : base("name=MSGContext")
    {
    }

    public virtual DbSet<article> article { get; set; }
    public virtual DbSet<section> section { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<article>()
            .Property(e => e.articleName)
            .IsFixedLength();

        modelBuilder.Entity<section>()
            .Property(e => e.sectionName)
            .IsFixedLength();

        modelBuilder.Entity<section>()
            .HasMany(e => e.article)
            .WithRequired(e => e.section)
            .HasForeignKey(e => e.articleSection)
            .WillCascadeOnDelete(false);
    }
}

文章表型号：

[Table("article")]
public partial class article
{
    public int articleId { get; set; }

    [Required]
    [StringLength(200)]
    public string articleName { get; set; }

    public int articleSection { get; set; }

    [Required]
    public string articleText { get; set; }

    public byte[] articlePhoto { get; set; }

    public virtual section section { get; set; }
}

截面表型号：

[Table("section")]
public partial class section
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public section()
    {
        article = new HashSet<article>();
    }

    public int sectionId { get; set; }

    [Required]
    [StringLength(100)]
    public string sectionName { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<article> article { get; set; }
}

数据库架构：

如何使用 HierarchicalDataTemplate 填充树视图？

需要有关向量数组的帮助。您需要将数组中的向量设置为某个长度（每个向量随机）。并用随机数填充每个向量。

int m; m = Convert::ToInt32(numericUpDown1->Value); // здесь я задаю переменную и присваиваю ей значение из numericupdown
    vector<vector<int>> vc; // создаю массив векторов
    vc.resize(m); // задаю кол-во векторов