How to get JSON item in web service workflow?

Im tried to get json item in workflow,But was unable to obtain "RtnCode",how to do it?
This my JSON,
"MerchantID": "1032017",
"RtnCode": "2",
"RtnMsg": "Get Succeeded",
My workflow :
Get RtnCodefrom
Variable: DealItems
Error code:
RequestorId: f85b0795-6682-fde7-0000-000000000000.
Details: An unhandled exception occurred during the execution of the workflow instance.
Exception details: System.InvalidOperationException: Looking up a value using a key is not supported on an instance of 'Microsoft.Activities.Dynamic.DynamicPrimitive'. at Microsoft.Activities.Dynamic.DynamicItem.TryGetValue(String key, DynamicItem&
value) at Microsoft.Activities.Dynamic.DynamicValueBuilder.PathSegmentFactory.ObjectPathSegment.Get(DynamicItem obj) at Microsoft.Activities.GetDynamicValueProperty`1.Execute(CodeActivityContext context) at System.Activities.CodeActivity`1.InternalExecute(ActivityInstance
instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation) Exception from activity
GetDynamicValueProperty<String> Start Sequence Flowchart Sequence Pay.WorkflowXaml_07f732da_c82a_4234_abd5_34c32c637413

Hi Felaray,
I have a similar issue and what I tried to do is to install JSON.NET in my project and used the "Assign" activity (under "Primitives" category on the toolbox) to assign the string to an object:
Newtonsoft
.Json.JsonConvert.DeserializeObject(resultFromCustomActivity)
but unfortunately did not work. I am getting this exception:
Visual Studio 2013 Workflow: Failed to translate expression because of the following error: Translating the method or one of its overloads to an activity is not supported
If you cannot really change the source header, you might need to create a code custom activity and pass in your string and use JSON.NET, parse it and return what you want.
Another "easier" option might involve doing some nasty parsing (using the Assign Activity) by finding the index of your "RntCode:" and getting the next set of characters before the comma. Since the .NET classes to utilize are limited
it would be worth trying to use a RegEx
resultFromCustomActivity
.Substring(0,
10)

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