Treeview.Nodes.Cast Not working

Question

TreeNode tnKey = 
    treeViewFilters
    .Nodes
    .Cast<TreeNode>()
    .Where(r => r.Text == FilterName)
    .ToArray()[0];

The above code is not working. It reports an error

Error   1   Instance argument: cannot convert from 'System.Windows.Forms.TreeNodeCollection' to 'System.Data.EnumerableRowCollection'   

Error   2   'System.Windows.Forms.TreeNodeCollection' does not contain a definition for 'Cast' and the best extension method overload 'System.Data.EnumerableRowCollectionExtensions.Cast<TResult>(System.Data.EnumerableRowCollection)' has some invalid arguments

I have taken code from Is there a method for searching for TreeNode.Text field in TreeView.Nodes collection? Any ideas?

This works fine in linqpad for me (replacing treeViewFilters with new TreeView()) and ToArray()[0] with FirstOrDefault(). — DaveShaw
– DaveShaw, Commented Jul 26, 2013 at 14:12

Nest · Accepted Answer · 2013-07-26 14:14:47Z

1

Sorry my mistake, i forget to add 'system.linq' name space

answered Jul 26, 2013 at 14:14

Nest

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Nikhil Agrawal Over a year ago

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