dynamic binding wpf - wpf

Question

Hi all this is my first question :)
This exemple tested on winform application and wpf application and the problem with binding on WPF
winform all works fine with ICustomTypeDescriptor and grid draw only columns added to Dictionary Properties (Name Age) and Male excluded
WPF all properties of the class person drawed on grid (Name Age Male)
any idea about this situation or interfaces equivalent of ICustomTypeDescriptor in wpf ?
<Grid>
<DataGrid AutoGenerateColumns="True" Height="200" HorizontalAlignment="Left" Margin="90,30,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="325" />
</Grid>
List<Person> persons = new List<Person>();
persons.Add(new Person("Aymane", 30));
persons.Add(new Person("Raouia", 30));
grid.ItemsSource = persons; //wpf
grid.DataSource = persons; //winform
public class Person : ICustomTypeDescriptor
{
Dictionary<string, object> Properties = new Dictionary<string, object>();
public Person()
{
Properties.Add("Name", null);
Properties.Add("Age", null);
}
public Person(string name, object value)
: base()
{
Male = true;
Name = name;
Age = value;
}
public bool Male { get; set; }
public object Age { get { return Properties["Age"]; } set { Properties["Age"] = value; } }
public object Name { get { return Properties["Name"]; } set { Properties["Name"] = value; } }
#region ICustomTypeDescriptor Members
AttributeCollection ICustomTypeDescriptor.GetAttributes()
{
return TypeDescriptor.GetAttributes(this, true);
}
string ICustomTypeDescriptor.GetClassName()
{
return TypeDescriptor.GetClassName(this, true);
}
string ICustomTypeDescriptor.GetComponentName()
{
return TypeDescriptor.GetComponentName(this, true);
}
TypeConverter ICustomTypeDescriptor.GetConverter()
{
return TypeDescriptor.GetConverter(this, true);
}
EventDescriptor ICustomTypeDescriptor.GetDefaultEvent()
{
return TypeDescriptor.GetDefaultEvent(this, true);
}
PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty()
{
return TypeDescriptor.GetDefaultProperty(this, true);
}
object ICustomTypeDescriptor.GetEditor(Type editorBaseType)
{
return TypeDescriptor.GetEditor(this, editorBaseType, true);
}
EventDescriptorCollection ICustomTypeDescriptor.GetEvents(Attribute[] attributes)
{
return TypeDescriptor.GetEvents(attributes, true);
}
EventDescriptorCollection ICustomTypeDescriptor.GetEvents()
{
return ((ICustomTypeDescriptor)this).GetEvents(null);
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties(Attribute[] attributes)
{
List<PropertyDescriptor> props = new List<PropertyDescriptor>();
props.Add(new PersonPropertyDescriptor("Name", attributes));
props.Add(new PersonPropertyDescriptor("Age", attributes));
return new PropertyDescriptorCollection(props.ToArray());
}
PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties()
{
return ((ICustomTypeDescriptor)this).GetProperties(null);
}
object ICustomTypeDescriptor.GetPropertyOwner(PropertyDescriptor pd)
{
return this;
}
#endregion
class PersonPropertyDescriptor : PropertyDescriptor
{
public PersonPropertyDescriptor(string name, Attribute[] attrs)
: base(name, attrs)
{
}
public override bool CanResetValue(object component)
{
return true;
}
public override Type ComponentType
{
get { return typeof(Person); }
}
public override object GetValue(object component)
{
return ((Person)component).Properties[Name];
}
public override bool IsReadOnly
{
get { return false; }
}
public override Type PropertyType
{
get { return typeof(object); }
}
public override void ResetValue(object component)
{
((Person)component).Properties[Name] = null;
}
public override void SetValue(object component, object value)
{
((Person)component).Properties[Name] = value;
}
public override bool ShouldSerializeValue(object component)
{
return false;
}
}
}

Answer 1

To gain control over the column generation handle the AutoGeneratingColumn event, have you can suppress the generation of a column by seting e.Cancel = true;
In your case:
private void DataGridAutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
var dataGrid = sender as DataGrid;
if (dataGrid != null)
{
ICustomTypeDescriptor typeDescriptor =
dataGrid.Items[0] as ICustomTypeDescriptor;
if (typeDescriptor != null)
{
var props = typeDescriptor.GetProperties();
if (!props.Contains((PropertyDescriptor)e.PropertyDescriptor))
{
e.Cancel = true;
}
}
}
}
With the DataGrid definition of:
<DataGrid
AutoGenerateColumns="True"
Height="311"
HorizontalAlignment="Left"
Name="dataGrid1"
VerticalAlignment="Top"
Width="509"
AutoGeneratingColumn="DataGridAutoGeneratingColumn">
Gives the desired result.

Answer 2

Here the correct implementation of ICustomTypeDescriptor & ITypedList
namespace CustomTypeDescriptor
{
class Row : ICustomTypeDescriptor { }
class RowsCollection : List<Row>, ITypedList { }
class Table : IListSource, IEnumerable<Row>, IEnumerator<Row>
{
RowsCollection Rows { get; set; }
}
}