Pass Data between Plug-Ins

The message pipeline model defines a parameter collection of custom data values in the execution context that is passed through the pipeline and shared among registered plug-ins, even from different 3rd party developers. This collection of data can be used by different plug-ins to communicate information between plug-ins and enable chain processing where data processed by one plug-in can be processed by the next plug-in in the sequence and so on. This feature is especially useful in pricing engine scenarios where multiple pricing plug-ins pass data between one another to calculate the total price for a sales order or invoice. Another potential use for this feature is to communicate information between a plug-in registered for a pre-event and a plug-in registered for a post-event. 

The name of the parameter that is used for passing information between plug-ins is SharedVariables. This is a collection of key\value pairs. At run time, plug-ins can add, read, or modify properties in the SharedVariables collection. This provides a method of information communication among plug-ins.

The name of the parameter that is used for passing information between plug-ins is SharedVariables. This is a collection of key\value pairs. At run time, plug-ins can add, read, or modify properties in the SharedVariables collection.

This sample shows how to use SharedVariables to pass data from a pre-event registered plug-in to a post-event registered plug-in.

using System;

// Microsoft Dynamics CRM namespace(s)

using Microsoft.Xrm.Sdk;

namespace Microsoft.Crm.Sdk.Samples

{

///

/// A plug-in that sends data to another plug-in through the SharedVariables

 /// property of IPluginExecutionContext.

 ///

 /// Register the PreEventPlugin for a pre-event and the

 /// PostEventPlugin plug-in on a post-event.

 ///

//Preevent Plugin

 public class PreEventPlugin : IPlugin

  {

   public void Execute(IServiceProvider serviceProvider)

   {

    // Obtain the execution context from the service provider.

    Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)

   serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));

    // Create or retrieve some data that will be needed by the post event

    // plug-in. You could run a query, create an entity, or perform a calculation.

  //In this sample, the data to be passed to the post plug-in is

   // represented by a GUID.

   Guid contact = new Guid("{74882D5C-381A-4863-A5B9-B8604615C2D0}");

  // Pass the data to the post event plug-in in an execution context shared

   // variable named PrimaryContact.

   context.SharedVariables.Add("PrimaryContact", (Object)contact.ToString());

   }

 }

 //Post Event Plugin

public class PostEventPlugin : IPlugin

  {

   public void Execute(IServiceProvider serviceProvider)

    {

     // Obtain the execution context from the service provider.

     Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)

     serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));

     // Obtain the contact from the execution context shared variables.

    if (context.SharedVariables.Contains("PrimaryContact"))

      {

       Guid contact =new Guid((string)context.SharedVariables["PrimaryContact"]);

     // Do something with the contact.

       }

     }

  }

}