How to resolve this binding error

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var oBackgroundGrid = new Grid
           {
               Opacity = .5 ,
               DataContext = PortSettings
           };

           oBackgroundGrid.SetBinding ( Panel.BackgroundProperty ,

           new Binding
           {
               Source = PortSettings,
               Path = new PropertyPath ( "PortSettings.CActual" ) ,
               Converter = new ColorTemplateSelector ( ) ,
               UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged ,
               Mode = BindingMode.TwoWay
           } );

i am creating a grid in code behind but it showing binding error as

System.Windows.Data Error: 40 : BindingExpression path error: 'PortSettings' property not found on 'object' ''CheckboxSetting' (HashCode=63345626)'. BindingExpression:Path=PortSettings.CActual; DataItem='CheckboxSetting' (HashCode=63345626); target element is 'Grid' (Name=''); target property is 'Background' (type 'Brush')

What I have tried:

i try everything, don't know what is the error

Posted 11-Jan-17 22:04pm

Mahesh Alappuzha

Updated 11-Jan-17 23:04pm

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Comments

Jon McKee 12-Jan-17 4:12am

Where is PortSettings defined? From the error, the binding doesn't seem to be able to locate this property. Would help to see the relationship between PortSettings and where this code is defined.

Mahesh Alappuzha 12-Jan-17 4:18am

private object _portSettings;
public object PortSettings
{
get { return _portSettings; }
set
{
_portSettings = value;
OnPropertyChanged ( );

}
}
this is the Portsettings Property

PortSettings = card.SettingsList.Where (
setting =>
setting.Ccode.Trim ( ).Equals ( sysSnmp ) ).Select ( setting => setting ).FirstOrDefault ( );
here i assign the the value.

Jon McKee 12-Jan-17 4:33am

I mean more what object they're defined on. Is the PortSettings property on the same object that oBackgroundGrid is defined on? The definitions look fine - it's probably an issue of where they're defined. WPF can be a hard thing to debug without the full code because so many things can go wrong or get overlooked.

Mahesh Alappuzha 12-Jan-17 4:39am

namespace Sample
{
public class SampleViewModel: PropertyChangedBase
{

#region [ Public Properties ]

private object _portSettings;
public object PortSettings
{
get { return _portSettings; }
set
{
_portSettings = value;
OnPropertyChanged ( );

}
}

#endregion

#region [ Public Methods ]

private void SampleFunction()
{

GetPortStatus ( );

var oBackgroundGrid = new Grid
{
Opacity = .5 ,
DataContext = PortSettings
};

oBackgroundGrid.SetBinding ( Panel.BackgroundProperty ,

new Binding
{
Source = PortSettings,
Path = new PropertyPath ( "PortSettings.CActual" ) ,
Converter = new ColorTemplateSelector ( ) ,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged ,
Mode = BindingMode.TwoWay
} );

oMasterGrid.Children.Add ( oBackgroundGrid );

public void GetPortStatus ( )
{

PortSettings = card.SettingsList.Where (
setting =>
setting.Ccode.Trim ( ).Equals ( sysSnmp ) ).Select ( setting => setting ).FirstOrDefault ( );
}

#endregion

}
}

Afzaal Ahmad Zeeshan 12-Jan-17 4:52am

Your code needs a lot of type casting...

Mahesh Alappuzha 12-Jan-17 4:55am

can u specific

Afzaal Ahmad Zeeshan 12-Jan-17 5:03am

The error says that the property was not found on "object", which means that you need to change that type of the object to a specific type where that property can be found.

See here for more.

Mahesh Alappuzha 12-Jan-17 5:05am

portsettings has different type thats why i given type as object

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Jon McKee · Accepted Answer · 2017-01-11T23:04:00

Took me a second but I think I know what's going on here. The Source should be set to the object (or parent) which contains the property you wish to access while the Path is the path to that property from the source. Try

C#

new Binding
{
Source = this,
Path = new PropertyPath ( "PortSettings" ) ,
Converter = new ColorTemplateSelector ( ) ,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged ,
Mode = BindingMode.TwoWay
}

EDIT: Note: If you want to access a property of PortSettings like CActual you need to cast the property or set the type of property to the proper type instead of object. Then just change the Path to new PropertyPath("PortSettings.CActual").