There are a lot of syntax and functional changes in MSCRM 2011 plugins. I have listed some of them below:
1. New References
• System.ServiceModel
• System.Runtime.Serialization

2. Microsoft.Crm.Sdk has been replaced by Microsoft.Xrm.Sdk

3. The default parameter for execute method has been changed from
IPluginExecutionContext to IServiceProvide

public void Execute(IServiceProvider serviceProvider)

4. IpluginExecutionContext has been changed to a type of service and to get the reference use the following syntax.

IPluginExecutionContext context = (IPluginExecutionContext)
serviceProvider.GetService(typeof(IPluginExecutionContext));

5. ICrmService has been changed to IOrganizationService

IOrganizationServiceFactory serviceFactory =
IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

6. Dynamic entity has been changed to “Entity”

if (context.InputParameters.Contains(“Target”) &&
context.InputParameters[“Target”] is Entity)
{
Entity entity = (Entity)context.InputParameters[“Target”];
}

7. Dynamic Entity’s properties syntax has been changed to attributes

entity.Attributes.Contains(“accountnumber”)

8. Strongly typed classes (account, contact) are missing in Microsoft.XRM.Sdk assembly but there is an exception to this.

9. CRM 2011 provides the crm utility called “crmsvcutil” to generate strongly typed classes that can be used in plugins.

10. Strongly typed classes has been changed to use like loosely typed classes.
Task task = new Task();
Task[“description”] = ”test description”

11. No more soap exception
catch (FaultException ex)

About the Author Dynatecon Solutions

DYNATECON is a group of dynamic professionals who are passionate about building affordable IT solutions using Dynamics 365 and Power platform. We focus on enabling digital transformation in Small scale as well as Medium scale industries. Whether you have 1 user or 100 users and planning to implement a new CRM system, please contact us at info@dynatecon.com. We can guide you for sure!

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