C# Programming :: Databinding takes high time


	Databinding takes high time Hi, In my usercontrol I bind the BindingSource I pass via property to all the control inside the usercontrol. For example Control ctl=new TextBox(); ctl.DataBindings.Add("Text", binding, prop, false, DataSourceUpdateMode.OnPropertyChanged); via ANTS Profiler I see that it takes so much time and the UI seems freeze (I have at least 10 controls to bind) The behaviour slow down if I bind a combobox... cmb.ValueMember = "Id"; cmb.DisplayMember = "Etichetta"; cmb.DataSource = binding; cmb.DataBindings.Add("SelectedItem", binding, prop, true, DataSourceUpdateMode.OnValidation, null); at least 0,7 seconds for each control. What is wrong? How can I speed up the binding task? Thanks Mauro Mauro, There isn't much you can do, really. Remember, data binding uses reflection to perform its operations, and that is inherently slower than other methods. The two things I can think of to speed up binding is to implement the INotifyPropertyChanged interface, as it will not use reflection for change notification on your type (assuming you are supporting it). Second, for your properties that you are bound to, just make sure that you are not doing a lot of heavy work in them (but that should be obvious). -- - Nicholas Paldino [.NET/C# MVP] - m@spam.guard.caspershouse.com "Mauro D." <mauro.destroSpam@tinspam.it> wrote in message news:_St7i.24331$%k.107207@twister2.libero.it... - Hide quoted text - > Hi, > In my usercontrol I bind the BindingSource I pass via property to all the > control inside the usercontrol. > For example > Control ctl=new TextBox(); > ctl.DataBindings.Add("Text", binding, prop, false, > DataSourceUpdateMode.OnPropertyChanged); > via ANTS Profiler I see that it takes so much time and the UI seems freeze > (I have at least 10 controls to bind) > The behaviour slow down if I bind a combobox... > cmb.ValueMember = "Id"; > cmb.DisplayMember = "Etichetta"; > cmb.DataSource = binding; > cmb.DataBindings.Add("SelectedItem", binding, prop, true, > DataSourceUpdateMode.OnValidation, null); > at least 0,7 seconds for each control. > What is wrong? How can I speed up the binding task? > Thanks > Mauro I'm not quite sure why it is so slow here, but if Nicholas is correct (and reflection is the lag), you could try the following; this improves the reflection -> component-model (i.e. what data-binding uses) performance by a factor of roughly 180. Which is nice ;-p http://www.codeproject.com/csharp/HyperPropertyDescriptor.asp Marc -----------------------------------------------Reply----------------------------------------------- Nicholas Paldino [.NET/C# MVP] wrote: > Mauro, > There isn't much you can do, really. Remember, data binding uses > reflection to perform its operations, and that is inherently slower than > other methods. > The two things I can think of to speed up binding is to implement the > INotifyPropertyChanged interface, as it will not use reflection for > change notification on your type (assuming you are supporting it). > Second, for your properties that you are bound to, just make sure > that you are not doing a lot of heavy work in them (but that should be > obvious). My class already implement the INotifyPropertyChanged interface... My problem is not linked with a change in the property value but only in the "startup time" of the binding. Mauro