如何防止datagridview为每个选定的行触发UserDeletingRow事件？

在我已经消费第一行后，我如何停止触发UserDeletingRow -event的DataGridView控件？如何防止datagridview为每个选定的行触发UserDeletingRow事件？

这个网格绑定到我的wcf-webservice中的对象，我想只对所有应该删除的对象执行一次delete方法。

此触发事件处理程序对每个选定行也触发总是“你真的要删除” -messageboxes：

private void Grid_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e) 
{ 
    switch (this.Type) 
    { 
     case AdminType.Channel: 
      List<Channel> channels = GrdChannel.SelectedRows.Cast<DataGridViewRow>() 
       .Select(row => (Channel)row.DataBoundItem).ToList(); 
      e.Cancel = !Delete_Channels(channels); 
      break; 
     // other types ... 
     default: 
      break; 
    } 
}

此方法调用确认后的web服务：

private bool Delete_Channels(List<Channel> channels) 
{ 
    var msg = string.Format("Do you really want to delete {0}?", channels.Count == 1 ? "this channel" : "these channels"); 
    var title = channels.Count == 1 ? "Delete channel" : "Delete channels"; 
    bool yes = MessageBox.Show(msg, title, MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes; 
    if (yes) 
    { 
     using (var db = new ERP_ServiceClient()) 
      db.DeleteChannels(channels, this.IdUser); 
     string message = string.Format("{0} deleted successfully: {1}" 
             , channels.Count == 1 ? "Channel" : "Channels" 
             , string.Join(",", channels.Select(p => p.Name))); 
     channelBindingSource.Remove(channels); 
     Main.ShowStatusMessage(message); 
    } 
    return yes; 
}

来源

2013-03-18 Tim Schmelter

因此，'Delete_Channels'等处理您的删除过程，但您希望将其组合到'Delete_Objects' - 例如？ – LukeHennerley 2013-03-18 10:36:36

你可能应该考虑构建一个你想要的行为。 AFAIK不存在多个删除处理的事件。对你来说可能就足够了：1.获取选定行数。 2.在每个事件中减少它并收集可删除的行信息到某个列表中3.在最后一行事件中将它添加到集合中，就像以前的所有事件一样，并立即删除它们调用服务或您需要执行的操作。 – Tigran 2013-03-18 10:38:30

@LukeHennerley：是的，没有。 'Delete_Channels'确认后通过web服务删除所有通道对象。但它需要所有的频道作为'列表'，所以我想一次通过所有选定的频道。 – 2013-03-18 10:43:43

好吧，显然没有更好的方法（就可读性而言），所以我实现了Tigrans建议在事件处理程序中使用count变量，并且仅在最后一个选定行触发此事件后才开始删除。

这里的变通方法：UserDeletingRow的与此事件

private int _deleteCount = 0; 
private bool _deleting = false; 
private bool _reallyDelete = false; 
private IEnumerable<object> _deleteEntities = null; 

private void Grid_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e) 
{ 
    DataGridView grid = (DataGridView)sender; 

    if (!_deleting) 
    { 
     _deleting = true; 
     _deleteCount = grid.SelectedRows.Count; 
     _deleteEntities = grid.SelectedRows.Cast<DataGridViewRow>().Select(r => r.DataBoundItem).ToList(); 
     string msg = ""; 
     string title = ""; 

     switch (this.Type) 
     { 
      case AdminType.Channel: 
       msg = string.Format("Do you really want to delete {0}?", _deleteCount == 1 ? "this channel" : "these channels"); 
       title = _deleteCount == 1 ? "Delete channel" : "Delete channels"; 
       break; 
      // other types ... 
      default: 
       break; 
     } 
     _reallyDelete = MessageBox.Show(msg, title, MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes; 
    } 

    e.Cancel = !_reallyDelete; 

    // wait until all events are triggered before starting to delete 
    if (--_deleteCount == 0) 
    { 
     switch (this.Type) 
     { 
      case AdminType.Channel: 
       List<Channel> channels = _deleteEntities.Cast<Channel>().ToList(); 
       Delete_Channels(channels); 
       break; 
      // other types ... 
      default: 
       break; 
     } 
     _deleting = false; 
     _reallyDelete = false; 
     _deleteEntities = null; 
    } 
}

来源

2013-03-18 11:25:53

我认为这有一个错误。如果您取消消息框“Delete_Channels（channels）”，仍然在最后一次迭代中调用。 – 2016-12-12 11:07:39

RPLACE事件KEY_DOWN

如果（e.KeyValue == 46）//删除键

{ e.Handled = MessageBox.Show（“你真的想删除选中的行”， “Confirm”，MessageBoxButtons.OKCancel，MessageBoxIcon.Question）！= DialogResult.OK; }

来源

2015-12-31 23:54:59

如何防止datagridview为每个选定的行触发UserDeletingRow事件？

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