WPF binding ComboBox to values from two objects
Good afternoon,
I have an issue binding two objects to my combobox.
Technically, I'm trying to achieve this:
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
};
But including all the cool features of TwoWay binding, meaning that changing SelectedItem in ComboBox also changes it on the SelectedModel.
To achieve such thing, I've tried doing this:
<ComboBox x:Name="CustomersComboBox"
ItemsSource="{Binding Customers}"
DisplayMemberPath="FullName"
IsSynchronizedWithCurrentItem="True"
SelectedValue="{Binding Path=SelectedModel.Customer, Mode=TwoWay}",
SelectedValuePath="FullName"/>
Which didn't work nor display any error in the output console.
It's also worth pointing out that Customers is an observable collection of type 'Customer' whereas SelectedModel is of type 'Contract'.
Contracts have Customer attached to them via Contract.Customer.
I could easily provide this functionality with code behind but that kinda dodges the purpose of MVVM.
c# wpf
asked Nov 22 at 20:56
JCode
476
|
show 2 more comments
Good afternoon,
I have an issue binding two objects to my combobox.
Technically, I'm trying to achieve this:
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
};
But including all the cool features of TwoWay binding, meaning that changing SelectedItem in ComboBox also changes it on the SelectedModel.
To achieve such thing, I've tried doing this:
<ComboBox x:Name="CustomersComboBox"
ItemsSource="{Binding Customers}"
DisplayMemberPath="FullName"
IsSynchronizedWithCurrentItem="True"
SelectedValue="{Binding Path=SelectedModel.Customer, Mode=TwoWay}",
SelectedValuePath="FullName"/>
Which didn't work nor display any error in the output console.
It's also worth pointing out that Customers is an observable collection of type 'Customer' whereas SelectedModel is of type 'Contract'.
Contracts have Customer attached to them via Contract.Customer.
I could easily provide this functionality with code behind but that kinda dodges the purpose of MVVM.
c# wpf
asked Nov 22 at 20:56
JCode
476
Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
Try binding againstSelectedIteminstead ofSelectedValue. Note that you useSelectedValuePath="FullName", which means thatSelectedValuewould work with string values (i am assuming FullName is a string property) and not withCustomerobjects.
– elgonzo
Nov 22 at 23:01
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as theCustomerscollection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.
– elgonzo
Nov 23 at 10:49
|
show 2 more comments
Good afternoon,
I have an issue binding two objects to my combobox.
Technically, I'm trying to achieve this:
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
};
But including all the cool features of TwoWay binding, meaning that changing SelectedItem in ComboBox also changes it on the SelectedModel.
To achieve such thing, I've tried doing this:
<ComboBox x:Name="CustomersComboBox"
ItemsSource="{Binding Customers}"
DisplayMemberPath="FullName"
IsSynchronizedWithCurrentItem="True"
SelectedValue="{Binding Path=SelectedModel.Customer, Mode=TwoWay}",
SelectedValuePath="FullName"/>
Which didn't work nor display any error in the output console.
It's also worth pointing out that Customers is an observable collection of type 'Customer' whereas SelectedModel is of type 'Contract'.
Contracts have Customer attached to them via Contract.Customer.
I could easily provide this functionality with code behind but that kinda dodges the purpose of MVVM.
c# wpf
asked Nov 22 at 20:56
JCode
476
Good afternoon,
I have an issue binding two objects to my combobox.
Technically, I'm trying to achieve this:
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
};
But including all the cool features of TwoWay binding, meaning that changing SelectedItem in ComboBox also changes it on the SelectedModel.
To achieve such thing, I've tried doing this:
<ComboBox x:Name="CustomersComboBox"
ItemsSource="{Binding Customers}"
DisplayMemberPath="FullName"
IsSynchronizedWithCurrentItem="True"
SelectedValue="{Binding Path=SelectedModel.Customer, Mode=TwoWay}",
SelectedValuePath="FullName"/>
Which didn't work nor display any error in the output console.
It's also worth pointing out that Customers is an observable collection of type 'Customer' whereas SelectedModel is of type 'Contract'.
Contracts have Customer attached to them via Contract.Customer.
I could easily provide this functionality with code behind but that kinda dodges the purpose of MVVM.
c# wpf
c# wpf
asked Nov 22 at 20:56
JCode
476
asked Nov 22 at 20:56
JCode
476
asked Nov 22 at 20:56
JCode
476
asked Nov 22 at 20:56
JCode
476
asked Nov 22 at 20:56
JCode
476
476
Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
Try binding againstSelectedIteminstead ofSelectedValue. Note that you useSelectedValuePath="FullName", which means thatSelectedValuewould work with string values (i am assuming FullName is a string property) and not withCustomerobjects.
– elgonzo
Nov 22 at 23:01
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as theCustomerscollection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.
– elgonzo
Nov 23 at 10:49
|
show 2 more comments
Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
Try binding againstSelectedIteminstead ofSelectedValue. Note that you useSelectedValuePath="FullName", which means thatSelectedValuewould work with string values (i am assuming FullName is a string property) and not withCustomerobjects.
– elgonzo
Nov 22 at 23:01
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as theCustomerscollection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.
– elgonzo
Nov 23 at 10:49
Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
Try binding against
SelectedItem instead of SelectedValue. Note that you use SelectedValuePath="FullName", which means that SelectedValue would work with string values (i am assuming FullName is a string property) and not with Customer objects.– elgonzo
Nov 22 at 23:01
Try binding against
SelectedItem instead of SelectedValue. Note that you use SelectedValuePath="FullName", which means that SelectedValue would work with string values (i am assuming FullName is a string property) and not with Customer objects.– elgonzo
Nov 22 at 23:01
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as the
Customers collection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.– elgonzo
Nov 23 at 10:49
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as the
Customers collection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.– elgonzo
Nov 23 at 10:49
|
show 2 more comments
1 Answer
1
active
oldest
votes
Have you tried to RaisePropertyChanged?
RaisePropertyChanged(SelectedModel.Customer); to notify the UI that something has been changed in the model. Perhaps implement it upon the selection change. That way it will fire up the property bound to your view.
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
then
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
RaisePropertyChanged(nameof(SelectedModel.Customer));
};
answered Nov 22 at 23:33
Joseph Meris
226
add a comment |
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Have you tried to RaisePropertyChanged?
RaisePropertyChanged(SelectedModel.Customer); to notify the UI that something has been changed in the model. Perhaps implement it upon the selection change. That way it will fire up the property bound to your view.
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
then
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
RaisePropertyChanged(nameof(SelectedModel.Customer));
};
answered Nov 22 at 23:33
Joseph Meris
226
add a comment |
Have you tried to RaisePropertyChanged?
RaisePropertyChanged(SelectedModel.Customer); to notify the UI that something has been changed in the model. Perhaps implement it upon the selection change. That way it will fire up the property bound to your view.
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
then
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
RaisePropertyChanged(nameof(SelectedModel.Customer));
};
answered Nov 22 at 23:33
Joseph Meris
226
add a comment |
Have you tried to RaisePropertyChanged?
RaisePropertyChanged(SelectedModel.Customer); to notify the UI that something has been changed in the model. Perhaps implement it upon the selection change. That way it will fire up the property bound to your view.
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
then
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
RaisePropertyChanged(nameof(SelectedModel.Customer));
};
answered Nov 22 at 23:33
Joseph Meris
226
Have you tried to RaisePropertyChanged?
RaisePropertyChanged(SelectedModel.Customer); to notify the UI that something has been changed in the model. Perhaps implement it upon the selection change. That way it will fire up the property bound to your view.
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
then
CrudGrid.SelectionChanged += (o, e) =>
{
CustomersComboBox.SelectedItem = SelectedModel?.Customer;
RaisePropertyChanged(nameof(SelectedModel.Customer));
};
answered Nov 22 at 23:33
Joseph Meris
226
answered Nov 22 at 23:33
Joseph Meris
226
answered Nov 22 at 23:33
Joseph Meris
226
answered Nov 22 at 23:33
Joseph Meris
226
226
add a comment |
add a comment |
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Could you please specify what do you mean when you say it doesn't work? Does it not set the SelectedModel.Customer to the customer you select from the combobox? Does it throw any runtime exceptions?
– mobearette
Nov 22 at 21:21
@mobearette it shows no errors in the Error List nor Output - the selected item just stays blank until I manually select something.
– JCode
Nov 22 at 21:36
Try binding against
SelectedIteminstead ofSelectedValue. Note that you useSelectedValuePath="FullName", which means thatSelectedValuewould work with string values (i am assuming FullName is a string property) and not withCustomerobjects.– elgonzo
Nov 22 at 23:01
@elgonzo I've also tried binding SelectedItem aswell as creating an 'adapter' - a simple property called SelectedCustomer that returns in getter => SelectedModel.Customer' - no avail.
– JCode
Nov 23 at 6:41
If you use SelectedItem, make sure to not use SelectedValueSelectedValuePath. Make sure that the binding can actually find the SelectedCustomer property (it should probably be in the same viewmodel as the
Customerscollection property). Make sure NotifyPropertyChanged event is raised whenever the value represented by SelectedCustomer changes. Set breakpoints on the setter and getter of the SelectedCustomer property to verify that the binding mechanism is actually being able to access the property.– elgonzo
Nov 23 at 10:49