c# - Why Browsable attribute makes property not bindable? -

i'm trying use system.windows.forms.propertygrid.

to make property not visible in grid 1 should use browsableattribute set false. adding attribute makes property not bindable.

example: create new windows forms project, , drop textbox , propertygrid onto form1. using code below, width of textbox not bound data.width:

public partial class form1 : form {     public form1()     {         initializecomponent();          data data = new data();         data.text = "qwe";         data.width = 500;          bindingsource bindingsource = new bindingsource();         bindingsource.add(data);          textbox1.databindings.add("text", bindingsource, "text", true,             datasourceupdatemode.onpropertychanged);         textbox1.databindings.add("width", bindingsource, "width", true,             datasourceupdatemode.onpropertychanged);          propertygrid1.selectedobject = data;     } } 

the code data class is:

public class data : ibindablecomponent {     public event eventhandler textchanged;     private string _text;     [browsable(true)]     public string text     {                 {             return _text;         }         set         {             _text = value;             if (textchanged != null)                 textchanged(this, eventargs.empty);         }     }      public event eventhandler widthchanged;     private int _width;     [browsable(false)]     public int width     {                 {             return _width;         }         set         {             _width = value;             if (widthchanged != null)                 widthchanged(this, eventargs.empty);         }     }      #region ibindablecomponent members      private bindingcontext _bindingcontext;     public bindingcontext bindingcontext     {                 {             if (_bindingcontext == null)                 _bindingcontext = new bindingcontext();              return _bindingcontext;         }         set         {             _bindingcontext = value;         }     }      private controlbindingscollection _databindings;     public controlbindingscollection databindings     {                  {             if (_databindings == null)                 _databindings = new controlbindingscollection(this);              return _databindings;             }     }      #endregion      #region icomponent members      public event eventhandler disposed;      public system.componentmodel.isite site     {                 {             return null;         }         set         {          }     }      #endregion      #region idisposable members      public void dispose()     {         throw new notimplementedexception();     }      #endregion } 

if switch browsable attribute true on every property in data works. seems bindingsource searches datasource browsable attribute.

updated answer based on update example:

i've done digging in reflector , discovered "problem" in listbindinghelper, used currencymanager, in turn used bindingsource (these in system.windows.forms namespace).

to discover bindable properties, currencymanager invokes listbindingsource.getlistitemproperties. under hood, calls out getlistitempropertiesbyinstance (when pass in single object). method has following line of code @ end:

return typedescriptor.getproperties(target, browsableattributelist); 

and implementation of browsableattributelist is:

private static attribute[] browsableattributelist {         {         if (browsableattribute == null)         {             browsableattribute = new attribute[] { new browsableattribute(true) };         }         return browsableattribute;     } } 

you can see is, in fact, filtering properties browsableattribute(true). should using bindableattribute instead, guess designers realized depending on browsableattribute , decided use 1 instead.

so unfortunately won't able around issue if use browsableattribute. options either marc suggests , use custom typeconverter, or filter property grid using 1 of solutions in question: programatically hide field in propertygrid.