I am working with a wpf application, and am currently in the process of implementing a property grid box, similar to one you might see in the properties window in Visual Studios.
I am populating this property window dynamically when items in my application are selected using reflection, but this means I must create the input method dynamically as well.(textbox,checkbox,combo box) depending on the type of property.
Since this is generated dynamically, I am forced to create these items programmatically.
I have the following code that determines if it is to generate a textbox, or a combo box from the property, and then it binds the combo box.
var attribute = (PropertyWindowAttribute) attributes[i];
if (attribute.Enumerated)
{
var combo = new ComboBox();
var binding = CreatePropertyBinding(Model.component, attribute.PropertyName);
combo.SetBinding(Selector.SelectedItemProperty, binding);
var enumValues = Enum.GetNames(Model.component.GetType().GetProperty(attribute.PropertyName).PropertyType);
foreach (var e in enumValues)
{
var item = new ComboBoxItem();
item.Content = e;
combo.Items.Add(item);
}
propertyList.Add(new PropertyElement(attribute.DisplayName, combo));
}
else
{
var binding = CreatePropertyBinding(Model.component, attribute.PropertyName);
var box = new TextBox();
box.SetBinding(TextBox.TextProperty, binding);
propertyList.Add(new PropertyElement(attribute.DisplayName, box));
}
}
and I also have this utility method which is being referenced
private static Binding CreatePropertyBinding(Component component, string path)
{
Binding binding = new Binding();
binding.Path = new PropertyPath(path);
binding.Mode = BindingMode.TwoWay;
binding.Source = component;
return binding;
}
The problem I am having is when I go to my application, and try to change the value of a combo box, I get the following error output in my application
System.Windows.Data Error: 23 : Cannot convert 'System.Windows.Controls.ComboBoxItem: Stretch' from type 'ComboBoxItem' to type 'System.Windows.HorizontalAlignment' for 'en-US' culture with default conversions; consider using Converter property of Binding. NotSupportedException:'System.NotSupportedException: EnumConverter cannot convert from System.Windows.Controls.ComboBoxItem. at System.ComponentModel.TypeConverter.GetConvertFromException(Object value) at System.ComponentModel.TypeConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) at MS.Internal.Data.DefaultValueConverter.ConvertHelper(Object o, Type destinationType, DependencyObject targetElement, CultureInfo culture, Boolean isForward)' System.Windows.Data Error: 7 : ConvertBack cannot convert value 'System.Windows.Controls.ComboBoxItem: Stretch' (type 'ComboBoxItem'). BindingExpression:Path=ComponentHorizontalAlignment; DataItem='TextFieldComponent' (HashCode=31097589); target element is 'ComboBox' (Name=''); target property is 'SelectedItem' (type 'Object') NotSupportedException:'System.NotSupportedException: EnumConverter cannot convert from System.Windows.Controls.ComboBoxItem. at MS.Internal.Data.DefaultValueConverter.ConvertHelper(Object o, Type destinationType, DependencyObject targetElement, CultureInfo culture, Boolean isForward) at MS.Internal.Data.ObjectTargetConverter.ConvertBack(Object o, Type type, Object parameter, CultureInfo culture) at System.Windows.Data.BindingExpression.ConvertBackHelper(IValueConverter converter, Object value, Type sourceType, Object parameter, CultureInfo culture)'
The values that are being bound to the combo boxes come from enums, but I am not sure what the fix is for this.