Using Assign Message in CRM 4.0 Plugin

Assign message is very usefull if you want to store history of all owners of a record with Start and End Date. Following code sample can be used to do this:


public void Execute(IPluginExecutionContext context)
{
if (context.InputParameters.Properties.Contains("Target") && context.InputParameters.Properties["Target"] is Moniker)
{
Moniker moniker = (Moniker)context.InputParameters.Properties["Target"];
Guid id = moniker.Id;
ICrmService crmService = context.CreateCrmService(true);
DynamicEntity PreImage = null;
DynamicEntity PostImage = null;
//Get the Pre and Post Images
if (context.PreEntityImages.Properties.Contains("Images") && context.PreEntityImages.Properties["Images"] is DynamicEntity)
{
PreImage = (DynamicEntity)context.PreEntityImages.Properties["Images"];
}
if (context.PostEntityImages.Properties.Contains("Images") && context.PostEntityImages.Properties["Images"] is DynamicEntity)
{
PostImage = (DynamicEntity)context.PostEntityImages.Properties["Images"];
}
if (PreImage != null && PostImage != null)
{
Guid? keyWorkerIdPre = Utils.GetOwnerId(PreImage, "ownerid");
Guid? keyWorkerIdPost = Utils.GetOwnerId(PostImage, "ownerid");
if (keyWorkerIdPre != keyWorkerIdPost)
{
//Close previous involvement records for this user
if (keyWorkerIdPre.HasValue)
{
CloseKeyWorkerRecord(id,keyWorkerIdPre.Value, crmService);
}
if (keyWorkerIdPost.HasValue)
{
CreateKeyWorkerHistoryRecord(id, keyWorkerIdPost.Value, crmService);
}
}
}
}
}


//GetOwnerId function


public static Guid? GetOwnerId(DynamicEntity entity, string attributeName)
{
attributeName = attributeName.ToLower();
if (entity.Properties.Contains(attributeName))
{
return ((Owner)entity.Properties[attributeName]).Value;
}
else
{
return null;
}
}