I have a grid bound to a collection of items.
An item has several properties and one property is a combination of 4 properties (omitted INotifyPropertyChanged etc):
public
class
MyItemViewModel
public
int
Number {
get
;
set
; }
public
string
NumberSeperator {
get
;
set
; }
public
int
SubNumber {
get
;
set
; }
public
string
SubSubNumber {
get
;
set
; }
public
string
FullNumber {
return
string
.Format(
"{0}{1}{2}{3}"
, Number, NumberSeperator, SubNumber, SubSubNumber);
There are of course more properties available but the focus is on these properties mentioned.
Now, I tried creating a custom column which will, in view mode, display the FullNumber property and in edit mode create 4 masked text boxes to edit those 4 properties seperatly (Number, NumberSeperator, SubNumber and SubSubNumber)
So I figured the cleanest & easiest way to do this was to define 5 dependency properties on the custom column, 1 for each property, so that I could bind to them in my xaml code:
<
MyCustomColumn
NumberBinding
=
"{Binding Number}"
NumberSeperatorBinding
=
"{Binding NumberSeperator}"
SubNumberBinding
=
"{Binding SubNumber}"
SubSubNumberBinding
=
"{Binding SubSubNumber}"
/>
So my column looked a bit like this:
public
class
MyCustomColumn : GridViewBoundColumnBase
public
Binding NumberBinding
get
{
return
(Binding)GetValue(NumberBindingProperty); }
set
{ SetValue(NumberBindingProperty, value); }
public
static
readonly
DependencyProperty NumberBindingProperty =
DependencyProperty.Register(
"NumberBinding"
,
typeof
(Binding),
typeof
(MyCustomColumn),
new
PropertyMetadata(
null
));
public
Binding NumberSeperatorBinding
get
{
return
(Binding)GetValue(NumberSeperatorBindingProperty); }
set
{ SetValue(NumberSeperatorBindingProperty, value); }
public
static
readonly
DependencyProperty NumberSeperatorBindingProperty =
DependencyProperty.Register(
"NumberSeperatorBinding"
,
typeof
(Binding),
typeof
(MyCustomColumn),
new
PropertyMetadata(
null
));
public
Binding SubNumberBinding
get
{
return
(Binding)GetValue(SubNumberBindingProperty); }
set
{ SetValue(SubNumberBindingProperty, value); }
public
static
readonly
DependencyProperty SubNumberBindingProperty =
DependencyProperty.Register(
"SubNumberBinding"
,
typeof
(Binding),
typeof
(MyCustomColumn),
new
PropertyMetadata(
null
));
public
Binding SubSubNumberBinding
get
{
return
(Binding)GetValue(SubSubNumberBindingProperty); }
set
{ SetValue(SubSubNumberBindingProperty, value); }
public
static
readonly
DependencyProperty SubSubNumberBindingProperty =
DependencyProperty.Register(
"SubSubNumberBinding"
,
typeof
(Binding),
typeof
(MyCustomColumn),
new
PropertyMetadata(
null
));
So when overriding the CreateCellEditElement function, I implemented is as such:
public
override
FrameworkElement CreateCellEditElement(GridViewCell cell,
object
dataItem)
var e1 =
new
RadMaskedNumericInput();
e1.SetBinding(RadMaskedNumericInput.ValueProperty, NumberBinding);
var e2 =
new
RadMaskedTextInput();
e2.SetBinding(RadMaskedTextInput.ValueProperty, NumberSeperatorBinding);
var e3 =
new
RadMaskedNumericInput();
e3.SetBinding(RadMaskedNumericInput.ValueProperty, SubNumberBinding);
var e4 =
new
RadMaskedTextInput();
e4.SetBinding(RadMaskedTextInput.ValueProperty, SubSubNumberBinding);
var wp =
new
WrapPanel();
wp.Children.Add(e1);
wp.Children.Add(e2);
wp.Children.Add(e3);
wp.Children.Add(e4);
return
wp;
However, when using this column it will complain that it can't find the
Number
,
NumberSeperator
,
SubNumber
and
SubSubNumber
properties on the viewmodel, which is the datacontext of the grid.
I thought it would work the same as the
DataMemberBinding
and automatically use as datacontext,
the row item
.
Any help would be appreciated :)
You just set the DataContext for RadGridView.
In order to have the DataContext of each GridViewRow to be an object from the bound collection, you need to have set an ItemsSource collection for RadGridView.
To get the Binding still be resolved in your case, you could specify a valid Source for it. You can define the MyItemViewModel as a StaticResource and then set it as a Source.
Regards,
Didie
Telerik
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Hi
Pablo
,
Can you please check out the
Create Custom Column Editor
and
Create Custom Editor
topics, as I believe you will find them helpful on this matter?
Hope this helps.
Best Regards,
Stefan X1
Telerik
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and share your thoughts.
Did anyone solve this? I have the same problem.
Regarding suggested solutions;
Dimitrina: The question about datacontext is for the context of the binding in the custom column, not for the gridview.
Stefan X1: Those topics doesn't cover this scenario creating a new bindable property for the column that should bind on the child elements like the datamemberbinding does.
