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POUnable to cast object of type 'Model.TreeModel' to type 'ViewModels.TreeViewModel'
 

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    <p>I am trying to create objects from another object which has a list of objects. But I am getting a casting error on the line where I do the casting. Is there a way to cast object of different collection on to another collection.</p> <p>Code:</p> <pre><code>public List&lt;TreeViewModel&gt; getAllTreeNodesFromModel() { treeNodeViewModel = treeModel.getTreeNodes().Select(a =&gt; new TreeViewModel { Children = a.Children.Select(c =&gt; new TreeViewModel{Value = c.Value}).ToList(), Value = a.Value, }).ToList(); return treeNodeViewModel; } // Making list observable public ObservableCollection&lt;TreeViewModel&gt; TreeView { get { return treeView; } set { if (treeView == value) return; treeView = value; NotifyPropertyChanged("TreeView"); } } </code></pre> <p>XAML:</p> <pre><code>&lt;TreeView Margin="644,137,6,6" Grid.RowSpan="2" ItemsSource="{Binding TreeView}"&gt; &lt;TreeView.Resources&gt; &lt;HierarchicalDataTemplate DataType="{x:Type local:MainWindowModel}" ItemsSource="{Binding Children}"&gt; &lt;CheckBox IsChecked="{Binding Value}" /&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/TreeView.Resources&gt; &lt;/TreeView&gt; </code></pre> <p>Here is my model:</p> <pre><code>public class TreeModel { public string Name { get; set; } public List&lt;TreeModel&gt; Children { get; set; } public string Value { get; set; } public TreeModel() { Children = new List&lt;TreeModel&gt;(); } public TreeModel(string name, List&lt;TreeModel&gt; children) { this.Name = name; this.Children = children; } public List&lt;TreeModel&gt; BuildTree(IEnumerable&lt;string&gt; strings) { return ( from s in strings let split = s.Split('.') group s by s.Split('.')[0] into g // Group by first component (before /) select new TreeModel { Value = g.Key, Children = BuildTree( // Recursively build children from s in g where s.Length &gt; g.Key.Length + 1 select s.Substring(g.Key.Length + 1)) // Select remaining components } ).ToList(); } // View Model public string Value { get; set; } public List&lt;TreeViewModel&gt; Children { get; set; } // List VM mapped from Model public List&lt;TreeViewModel&gt; getAllTreeNodesFromModel() { treeNodeViewModel = treeModel.getTreeNodes().Select(a =&gt; new TreeViewModel { Children = a.Children.Cast&lt;TreeViewModel&gt;().ToList(), Value = a.Value, }).ToList(); return treeNodeViewModel; } </code></pre> <p>XAML:</p> <pre><code>&lt;TreeView Margin="644,137,6,6" Grid.RowSpan="2" ItemsSource="{Binding TreeView}" &gt; &lt;TreeView.Resources&gt; &lt;HierarchicalDataTemplate DataType="{x:Type local:MainWindowModel}" ItemsSource="{Binding Children}"&gt; &lt;CheckBox IsChecked="{Binding Value}" /&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/TreeView.Resources&gt; &lt;/TreeView&gt; </code></pre>
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    1. USAnatoliy Nikolaev
    1. USEda
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      1. POUnable to cast object of type 'Model.TreeModel' to type 'ViewModels.TreeViewModel'
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    2. VO
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    1. COPropably in line with error you should create TreeViewModel, not cast: Children = a.Children.Select(c => new TreeViewModel{Value = c.Value}).ToList()
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      1. POUnable to cast object of type 'Model.TreeModel' to type 'ViewModels.TreeViewModel'
      1. USJakub Jarzabek
    2. COPlease show the signature of TreeModel and TreeViewModel (how classes are defined) and TreeViewModel's constructor.
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      1. POUnable to cast object of type 'Model.TreeModel' to type 'ViewModels.TreeViewModel'
      1. USLouis Kottmann
    3. CO@Baboon I edit the original post
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      1. USEda
 

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