The InputParameters property contains the data that is in the request message currently being processed by the event execution pipeline. Your plug-in code can access this data. The property is of type ParameterCollection where the keys to access the request data are the names of the actual public properties in the request. As an example, take a look at CreateRequest. One property of CreateRequest is named Target which is of type Entity. This is the entity currently being operated upon by the platform. To access the data of the entity you would use the name "Target" as the key in the input parameter collection. You also need to cast the returned instance.
// The InputParameters collection contains all the data passed in the message request.
if (context.InputParameters.Contains("Target") &&
context.InputParameters["Target"] is Entity)
{
// Obtain the target entity from the input parmameters.
Entity entity = (Entity)context.InputParameters["Target"];
Similarly, the OutputParameters property contains the data that is in the response message, for example CreateResponse, currently being passed through the event execution pipeline. However, only synchronous post-event and asynchronous registered plug-ins have OutputParameters populated as the response is the result of the core platform operation. The property is of type ParameterCollection where the keys to access the response data are the names of the actual public properties in the response.
