Plugin Parameters

Although the CRM 4.0 SDK is generally pretty comprehensive, I find it doesn't contain as much information as I'd like about the information passed to plugins for each of the messages.

The following table lists the main parameters passed to plugins on the most common messages. If the message you want isn't listed here, post a comment and I'll update the table.

Message	Parameter	Direction	Type	Comments
Assign	Assignee	Input	SecurityPrincipal
Assign	Target	Input	Moniker
CancelSalesOrder	OrderClose	Input	DynamicEntity
Close	*ActivityClose	Input	DynamicEntity
Close	Status	Input	Int32
Create	id	Output	Guid	Only available on the Post Stage
Create	Target	Input	DynamicEntity
Delete	Target	Input	Moniker
Execute	FetchXml	Input	String
Execute	FetchXmlResult	Output	String
GrantAccess	PrincipalAccess	Input	PrincipalAccess
GrantAccess	Target	Input	Moniker
Handle	SourceQueueId	Input	Guid
Handle	Target	Input	DynamicEntity
Lose	*ActivityClose	Input	DynamicEntity
Lose	Status	Input	Int32
Retrieve	BusinessEntity	Output	DynamicEntity
Retrieve	ColumnSet	Input	ColumnSetBase
Retrieve	Target	Input	Moniker
RetrieveExchangeRate	ExchangeRate	Output	Decimal
RetrieveExchangeRate	TransactionCurrencyId	Input	Guid
RetrieveMultiple	BusinessEntityCollection	Output	BusinessEntityCollection
RetrieveMultiple	Query	Input	QueryExpression
RetrieveMultiple	ReturnDynamicEntities	Input	Boolean
RetrievePrincipalAccess	AccessRights	Output	AccessRights
RetrievePrincipalAccess	Principal	Input	SecurityPrincipal
RetrievePrincipalAccess	Target	Input	Moniker
RevokeAccess	Revokee	Input	PrincipalAccess
RevokeAccess	Target	Input	Moniker
Route	EndpointId	Input	Guid
Route	RouteType	Input	RouteType
Route	SourceQueueId	Input	Guid
Route	Target	Input	Moniker
Send	EmailId	Input	Guid
Send	IssueSend	Input	Boolean
Send	Subject	Output	String	This is the subject after the tracking token has been added
Send	TrackingToken	Input	String
SetStateDynamicEntity	EntityMoniker	Input	Moniker
SetStateDynamicEntity	State	Input	String
SetStateDynamicEntity	Status	Input	Int32
Update	Target	Input	DynamicEntity	To get the Primary Key, find the KeyProperty within the DynamicEntity
Win	*ActivityClose	Input	DynamicEntity
Win	QuoteClose	Input	DynamicEntity
Win	Status	Input	Int32

Notes:
*ActivityClose. For the Win, Lose and Close messages, one of the parameters is an activity type whose name depends on the primary entity - e.g. the Win message could have a QuoteClose or OpportunityClose entity passed to it

To gather this information I used the plugin tools described on the MSCRM Team blog. The source code for these tools can be found here:
Bulk Registration Tool
Plugin Logger

Other Links:
Plugin Development
Plugin Messages