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POObject of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'
 

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  1. POObject of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'
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    <p>I wonder if anyone can help. I have been banging my head against this problem for half a day now, I must be doing something wrong. I have a custom control with a number of dependency properties. </p> <pre><code>[TemplatePart(Name = InformationBubble.InformationBubbleTitlePart, Type = typeof(TextBlock))] [TemplatePart(Name = InformationBubble.InformationBubbleProductImagePart, Type=typeof(Image))] public class InformationBubble : Control { #region Template Parts Name Constants /// &lt;summary&gt; /// Name constant for the Information Bubble Title Part /// &lt;/summary&gt; public const string InformationBubbleTitlePart = "InformationBubbleTitleText"; /// &lt;summary&gt; /// Name constant for the Information Bubble Product Image Part /// &lt;/summary&gt; public const string InformationBubbleProductImagePart = "InformationBubbleProductImage"; #endregion #region TemplateParts private TextBlock _Title; internal TextBlock Title { get { return _Title; } private set { _Title = value; if (_Title != null) { _Title.Text = this.ProductTitleText; } } } private Image _ProductImage; internal Image ProductImage { get { return _ProductImage; } private set { _ProductImage = value; if (_ProductImage != null) { _ProductImage.Source = this.ProductImageSource; } } } #endregion #region Public String Product Title // Dependency properties declaration public static readonly DependencyProperty ProductTitleProperty = DependencyProperty.Register( "ProductTitle", typeof(string), typeof(InformationBubble), new PropertyMetadata(string.Empty, new PropertyChangedCallback(OnProductTitleChanged))); public static void OnProductTitleChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { InformationBubble iBubble = sender as InformationBubble; if (iBubble.Title != null) { iBubble.Title.Text = e.NewValue as string; } } public string ProductTitleText { get { return GetValue(ProductTitleProperty) as string; } set { SetValue(ProductTitleProperty, value); } } #endregion #region Public Image Source Product Image public static readonly DependencyProperty ProductImageSourceProperty = DependencyProperty.Register( "ProductImageSource", typeof(ImageSource), typeof(InformationBubble), new PropertyMetadata(null, new PropertyChangedCallback(OnProductImageSourceChanged))); public static void OnProductImageSourceChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { InformationBubble iBubble = sender as InformationBubble; if (iBubble.ProductImage != null) { iBubble.ProductImage.Source = e.NewValue as ImageSource; } } public ImageSource ProductImageSource { get { return GetValue(ProductImageSourceProperty) as ImageSource; } set { SetValue(ProductImageSourceProperty, value); } } #endregion public InformationBubble() { this.DefaultStyleKey = typeof(InformationBubble); } #region Overrides public override void OnApplyTemplate() { base.OnApplyTemplate(); Title = GetTemplateChild(InformationBubble.InformationBubbleTitlePart) as TextBlock; ProductImage = GetTemplateChild(InformationBubble.InformationBubbleProductImagePart) as Image; } #endregion #region Private Methods private void GoToState(string stateName, bool useTransitions) { VisualStateManager.GoToState(this, stateName, useTransitions); } #endregion } </code></pre> <p>Now if I use this control somewhere in my xaml it works if I do this:</p> <pre><code>&lt;controls:InformationBubble ProductImageSource="{Binding SelectedItem.NormalImageSource}" ProductTitleText="Test Title" "/&gt; </code></pre> <p>But if I try and data bind the product title text to the title property of the SelectedItem object in my ViewModel:</p> <pre><code>&lt;controls:InformationBubble ProductImageSource="{Binding SelectedItem.NormalImageSource}" ProductTitleText="{Binding SelectedItem.Title, Mode=TwoWay" "/&gt; </code></pre> <p>I get Object of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'. The text property of a TextBlock is a DependencyProperty so I must be missing something obvious here.</p> <p>Any help or insight is much appreciated.</p> <p>Kris </p>
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    1. USKristian Wilson
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    1. COI agree with Ole, you seem to have a typo when you register you dependency property. Just a note, you can use the snippet for dependency property creation which is `propdp tab tab`. That should help in the future :)
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      1. USJose
 

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