对话框必须由用户启动-带有导出数据的SearchScreen [英] Dialogs must be user-initiated - SearchScreen with export data

问题描述

你好

我具有SearchScreen，并希望在LS应用程序的Web变体中导出为CSV.

I have SearchScreen and want to export to CSV in Web variant of LS app.

当我首先单击btn进行导出一切正常，但是当添加搜索条件并点击Enter或单击一行以获取详细数据，然后再次单击以导出btn时例外对话框必须由用户启动".

When I firstly click btn for Export everything is OK, but when add Search Criteria and hit Enter or click on one row to get detailed data and then click again to Export btn I got exception "Dialogs must be user-initiated".

代码为:

partial void Employees_Loaded(bool succeeded)
{
	SetupExportCSVBtn();
}

private void SetupExportCSVBtn()
{
	string csv = GetCSVData(this.DataWorkspace.ApplicationData.Employees); 

	this.FindControl("ExportToCSV").ControlAvailable += new EventHandler<ControlAvailableEventArgs>
	((object1, eventargs1) =>
	{
		Button btnExport = (Button)eventargs1.Control;
		btnExport.Click += new RoutedEventHandler(
		(object2, eventargs2) =>
		{
			var dialog = new SaveFileDialog();
			dialog.Filter = "CSV (*.csv)|*.csv";
			
			if (dialog.ShowDialog() == true)
			{
				using (StreamWriter stream = new StreamWriter(dialog.OpenFile()))
				{
					stream.Write(csv);
					stream.Close();
				}
			}
		});
	});
}

private string GetCSVData(IEntitySet collumn)
{
//code for getting data
}

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