They didn’t add a default mechanism for binding to dynamic objects and instead added a new interface ICustomTypeProvider. And that interface wasn’t added to an ExpandoObject either, but with expando you should be able to use the indexer binding since it is an IDictionary<string, object> that implements INotifyPropertyChanged. <TextBlock Text=”{Binding [Foo]}”/>
I can’t serialize ExpandoObject, but I can manually serialize DynamicObject. So using the TryGetMember/TrySetMember methods of DynamicObject and implementing ISerializable, I can solve my problem which was really to serialize a dynamic object. I’ve implemented the following in my simple test app: using System; using System.Windows.Forms; using System.IO; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; using System.Collections.Generic; using … Read more
ExpandoObject implements IDictionary<string, object>: ((IDictionary<string, object>)obj)[propName] = propValue I don’t know off the top of my head whether you can use the indexer syntax with a dynamic reference (i.e., without the cast), but you can certainly try it and find out.
Cast the expando to IDictionary<string, object> and call Remove: var dict = (IDictionary<string, object>)foo; dict.Remove(“bang”);
Ultimately I needed to do two things: Generate the columns manually from the list of properties returned by the query Set up a DataBinding object After that the built-in data binding kicked in and worked fine and didn’t seem to have any issue getting the property values out of the ExpandoObject. <DataGrid AutoGenerateColumns=”False” ItemsSource=”{Binding Results}” … Read more
Just define your own class to do it: class Expando(object): pass ex = Expando() ex.foo = 17 ex.bar = “Hello”
I wondered how it might be possible to add members to a class “on the fly” and came up with this sample: using System; using System.Collections.Generic; using System.Dynamic; class Program { static void Main() { dynamic expando = new ExpandoObject(); var p = expando as IDictionary<String, object>; p[“A”] = “New val 1”; p[“B”] = “New … Read more
Expando is a dynamic type to which members can be added (or removed) at runtime. dynamic is designed to allow .NET to interoperate with types when interfacing with dynamic typing languages such as Python and JavaScript. So, if you need to handle a dynamic type: use dynamic and if you need to handle dynamic data … Read more
how the Expando was able to hide the method of one of its interfaces. Because as you correctly found out in the documentation, the indexer is an explicit interface implementation. From Explicit Interface Implementation Tutorial: A class that implements an interface can explicitly implement a member of that interface. When a member is explicitly implemented, … Read more
Am I doing something wrong, or is the following code really not possible? It’s really not possible. The thing on the left of the assignment operator has to be a property or field known at compile time, and obviously that is not the case for expando objects. Why would the C# team opt to disallow … Read more