小编use*_*283的帖子

我想知道ViewState ["object"]和Page.Items ["object"]之间有什么区别？

你好,我有点困惑的是如何从单个项目中的表中获得单个"项目"而不是集合...

这是我的viewmodel:

public class ProjectViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    private int _loadedProjectId;
    public int LoadedProjectId
    {
        get
        {
            return _loadedProjectId;
        }
        set
        {
            if (value != _loadedProjectId)
            {
                _loadedProjectId = value;
                _Context.Load(_Context.GetProjectFromIdQuery(_loadedProjectId)); 
                PropertyChanged(this, new PropertyChangedEventArgs("LoadedProjectId"));
            }
        }
    }

    public Project loadedProject { get; set; }
    public IEnumerable<Project> Projects { get; set; }

    private myDomainContext _Context = new myDomainContext();

    public ProjectViewModel()
    {

        Projects = _Context.Projects;
        if (!DesignerProperties.IsInDesignTool)
        {
            _Context.Load(_Context.GetProjectsQuery());
        }

    }
}

问题出在这里

_Context.Load(_Context.GetProjectFromIdQuery(_loadedProjectId)); …