Question

我有一个绑定到BindingListCollectionView（＆＃34; MyView＆＃34;）的DataGrid，它引用了一个Dataset.table.defaultview。当我刷新MicrosoftSQL表中的数据时，计时器中的DataTable会更新，但不会更新我的视图中的数据网格。

XAML：

<DataGrid Name="dataGrid1" IsReadOnly="True" ItemsSource="{Binding Path=MyView, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" KeyDown="dataGrid1_KeyDown" />

代码背后的代码：

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private DataSet _exhibitionTeam;
    private static string CONN_STRING = @"Server=testServer;Database=TestDB;Uid=TestUser;Pwd=TestPwd;";
    string SELECT_SQL = "SELECT kurzzeichen,name,mail,telefon from pers_didacta";
    BackgroundWorker worker;

    private BindingListCollectionView _view;

    public BindingListCollectionView MyView
    {
        get { return this._view; }
        protected set
        {
            this._view = value;
            //this.NotifyPropertyChanged(() => this.MyView);
            RaisePropertyChanged("MyView");
        }
    }

    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
        _exhibitionTeam = new DataSet("dsExhibitionTeam");
        ReadDataIntoDataSet();

        this.MyView = (BindingListCollectionView)CollectionViewSource.GetDefaultView(_exhibitionTeam.Tables["Team"].DefaultView);

        worker = new BackgroundWorker();
        worker.DoWork += new DoWorkEventHandler(worker_DoWork);
        worker.RunWorkerAsync();
    }

    private void worker_DoWork(object sender, DoWorkEventArgs e)
    {
        while (true)
        {
            RefreshDataIntoDataSet();
            this.MyView.Refresh();
            Thread.Sleep(2000);
        }
    }


    public DataSet ExhibitionTeam
    {
        get
        {
            return _exhibitionTeam;
        }
        set
        {
            _exhibitionTeam = value;
            RaisePropertyChanged("ExhibitionTeam");
        }
    }

    private void ReadDataIntoDataSet()
    {
        using (SqlConnection con = new SqlConnection(CONN_STRING))
        {
            SqlCommand cmd = new SqlCommand(SELECT_SQL, con);
            SqlDataAdapter myMySqlDataAdapter = new SqlDataAdapter(cmd);
            myMySqlDataAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
            myMySqlDataAdapter.Fill(_exhibitionTeam, "Team");
            myMySqlDataAdapter.Dispose(); //not needed any longer!
        }
    }

    private void RefreshDataIntoDataSet()
    {
        using (SqlConnection con = new SqlConnection(CONN_STRING))
        {
            con.Open();
            DataSet myDataSet;
            SqlCommand cmd = new SqlCommand(SELECT_SQL, con);
            SqlDataAdapter myMySqlDataAdapter = new SqlDataAdapter(cmd);
            myMySqlDataAdapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
            myDataSet = new DataSet("dsExhibitions");
            myMySqlDataAdapter.Fill(myDataSet, "Team");
            ExhibitionTeam.Merge(myDataSet, false);
            myMySqlDataAdapter.Dispose(); //not needed any longer!
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void RaisePropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = this.PropertyChanged;
        if (handler != null)
        {
            var e = new PropertyChangedEventArgs(propertyName);
            handler(this, e);
        }
    }

    private void dataGrid1_KeyDown(object sender, KeyEventArgs e)
    {
        RefreshDataIntoDataSet();
    }
}

当我按下数据网格上的任意键时，数据会更新。但是我背景工作者的方法也不行。

我也试图绑定对于ExhibitionTeam.Tables [团队]，但这是相同的结果。

我的解决方案有什么问题？为什么我的数据网格没有更新？合并期间数据集更新（在调试器中看到）。

稍后我想通过使用SqlDependency检测更改来更新数据集。

Answer 1

如果您调试代码并且

之后数据表中的值正常

this.MyView.Refresh();

然后你可以简单地调用

$a=10;
$z=30;
for($prime = $a; $prime<$z; $prime++)
{ if
(Prim($prime) == TRUE)
{  echo $prime."<br/>";}}

我不知道合并是否会引发notifypropertychanged

绑定到数据集的数据网格未更新

1 个答案: