expandoobject – Page 2

How to flatten an ExpandoObject returned via JsonResult in asp.net mvc?

January 8, 2023 by Tarik

Using JSON.NET you can call SerializeObject to “flatten” the expando object: dynamic expando = new ExpandoObject(); expando.name = “John Smith”; expando.age = 30; var json = JsonConvert.SerializeObject(expando); Will output: {“name”:”John Smith”,”age”:30} In the context of an ASP.NET MVC Controller, the result can be returned using the Content-method: public class JsonController : Controller { public ActionResult … Read more

Differences between ExpandoObject, DynamicObject and dynamic

October 20, 2022 by Tarik

The dynamic keyword is used to declare variables that should be late-bound. If you want to use late binding, for any real or imagined type, you use the dynamic keyword and the compiler does the rest. When you use the dynamic keyword to interact with a normal instance, the DLR performs late-bound calls to the … Read more

How to detect if a property exists on an ExpandoObject?

October 17, 2022 by Tarik

According to MSDN the declaration shows it is implementing IDictionary: public sealed class ExpandoObject : IDynamicMetaObjectProvider, IDictionary<string, Object>, ICollection<KeyValuePair<string, Object>>, IEnumerable<KeyValuePair<string, Object>>, IEnumerable, INotifyPropertyChanged You can use this to see if a member is defined: var expandoObject = …; if(((IDictionary<String, object>)expandoObject).ContainsKey(“SomeMember”)) { // expandoObject.SomeMember exists. }

Dynamically adding properties to an ExpandoObject

October 1, 2022 by Tarik

dynamic x = new ExpandoObject(); x.NewProp = string.Empty; Alternatively: var x = new ExpandoObject() as IDictionary<string, Object>; x.Add(“NewProp”, string.Empty);