SqlDependency - How do I interpret the SqlNotificationEventArgs properties?

I'm using the SqlDependency class and have been trying unsuccessfully to find a list of possible combinations of the Type, Source and Info properties of the SqlNotificationEventArgs object.

This is the closest I've found so far. However, I know this doesn't cover everything because I've already seen the combination Change/Client/Error.

I'd really like to know if I'm handling all possible cases in the best possible way. That is, whenever possible I'd like to reestablish the "subscription".

For instance the Change/Client/Error was do to a network issue that interrupted communication between SqlServer and my app. Once communication was reestablished I was able to recover successfully.

EDIT:

Maybe it would help if I gave some examples of the concerns I have. For the following questions when I say "recover" I mean reestablish a subscription at runtime, that is without manual intervent开发者_StackOverflow社区ion.

• Is it safe to assume that a Type of Subscribe means there is nothing I can do to recover.
• Is it safe to assume that a Source of Data will always have a Info of truncate, insert, update, or delete. If not will it always be something similar. I don't currently distinguish between these cases and I just reestablish the subscription and fetch the updated data.
• Is it safe to assume that, with the possible exception of an Info of Alter, a Source of object means that my query is no longer valid and I won't be able to recover.

Type can be any of: Change, Subscribe, or Unknown

  public enum SqlNotificationType {
        Change      = 0,
        Subscribe   = 1,

        // use negative values for client-only-generated values
        Unknown     = -1
    }

Source can be any of: Data, Timeout, Object, Database, System, Statement, Environment, Execution, Owner, Unknown, or Client

public enum SqlNotificationSource {
    Data        = 0,
    Timeout     = 1,
    Object      = 2,
    Database    = 3,
    System      = 4,
    Statement   = 5,
    Environment = 6,
    Execution   = 7,
    Owner       = 8,

    // use negative values for client-only-generated values
    Unknown     = -1,
    Client      = -2
}

Info can be any of: Truncate, Insert, Update, Delete, Drop, Alter, Restart, Error, Query, Invalid, Options, Isolation, Expired, Resource, PreviousFire, TemplateLimit, Merge, Unknown, or AlreadyChanged

public enum SqlNotificationInfo {
        Truncate      = 0,
        Insert        = 1,
        Update        = 2,
        Delete        = 3,
        Drop          = 4,
        Alter         = 5,
        Restart       = 6,
        Error         = 7,
        Query         = 8,
        Invalid       = 9,
        Options       = 10,
        Isolation     = 11,
        Expired       = 12,
        Resource      = 13,
        PreviousFire  = 14,
        TemplateLimit = 15,
        Merge         = 16,

        // use negative values for client-only-generated values
        Unknown        = -1,
        AlreadyChanged = -2
    }

And finally, in answer to your question a list of possible combinations:

(Change, Data, Truncate), (Change, Data, Insert), (Change, Data, Update), (Change, Data, Delete), (Change, Data, Drop), (Change, Data, Alter), (Change, Data, Restart), (Change, Data, Error), (Change, Data, Query), (Change, Data, Invalid), (Change, Data, Options), (Change, Data, Isolation), (Change, Data, Expired), (Change, Data, Resource), (Change, Data, PreviousFire), (Change, Data, TemplateLimit), (Change, Data, Merge), (Change, Data, Unknown), (Change, Data, AlreadyChanged), (Change, Timeout, Truncate), (Change, Timeout, Insert), (Change, Timeout, Update), (Change, Timeout, Delete), (Change, Timeout, Drop), (Change, Timeout, Alter), (Change, Timeout, Restart), (Change, Timeout, Error), (Change, Timeout, Query), (Change, Timeout, Invalid), (Change, Timeout, Options), (Change, Timeout, Isolation), (Change, Timeout, Expired), (Change, Timeout, Resource), (Change, Timeout, PreviousFire), (Change, Timeout, TemplateLimit), (Change, Timeout, Merge), (Change, Timeout, Unknown), (Change, Timeout, AlreadyChanged), (Change, Object, Truncate), (Change, Object, Insert), (Change, Object, Update), (Change, Object, Delete), (Change, Object, Drop), (Change, Object, Alter), (Change, Object, Restart), (Change, Object, Error), (Change, Object, Query), (Change, Object, Invalid), (Change, Object, Options), (Change, Object, Isolation), (Change, Object, Expired), (Change, Object, Resource), (Change, Object, PreviousFire), (Change, Object, TemplateLimit), (Change, Object, Merge), (Change, Object, Unknown), (Change, Object, AlreadyChanged), (Change, Database, Truncate), (Change, Database, Insert), (Change, Database, Update), (Change, Database, Delete), (Change, Database, Drop), (Change, Database, Alter), (Change, Database, Restart), (Change, Database, Error), (Change, Database, Query), (Change, Database, Invalid), (Change, Database, Options), (Change, Database, Isolation), (Change, Database, Expired), (Change, Database, Resource), (Change, Database, PreviousFire), (Change, Database, TemplateLimit), (Change, Database, Merge), (Change, Database, Unknown), (Change, Database, AlreadyChanged), (Change, System, Truncate), (Change, System, Insert), (Change, System, Update), (Change, System, Delete), (Change, System, Drop), (Change, System, Alter), (Change, System, Restart), (Change, System, Error), (Change, System, Query), (Change, System, Invalid), (Change, System, Options), (Change, System, Isolation), (Change, System, Expired), (Change, System, Resource), (Change, System, PreviousFire), (Change, System, TemplateLimit), (Change, System, Merge), (Change, System, Unknown), (Change, System, AlreadyChanged), (Change, Statement, Truncate), (Change, Statement, Insert), (Change, Statement, Update), (Change, Statement, Delete), (Change, Statement, Drop), (Change, Statement, Alter), (Change, Statement, Restart), (Change, Statement, Error), (Change, Statement, Query), (Change, Statement, Invalid), (Change, Statement, Options), (Change, Statement, Isolation), (Change, Statement, Expired), (Change, Statement, Resource), (Change, Statement, PreviousFire), (Change, Statement, TemplateLimit), (Change, Statement, Merge), (Change, Statement, Unknown), (Change, Statement, AlreadyChanged), (Change, Environment, Truncate), (Change, Environment, Insert), (Change, Environment, Update), (Change, Environment, Delete), (Change, Environment, Drop), (Change, Environment, Alter), (Change, Environment, Restart), (Change, Environment, Error), (Change, Environment, Query), (Change, Environment, Invalid), (Change, Environment, Options), (Change, Environment, Isolation), (Change, Environment, Expired), (Change, Environment, Resource), (Change, Environment, PreviousFire), (Change, Environment, TemplateLimit), (Change, Environment, Merge), (Change, Environment, Unknown), (Change, Environment, AlreadyChanged), (Change, Execution, Truncate), (Change, Execution, Insert), (Change, Execution, Update), (Change, Execution, Delete), (Change, Execution, Drop), (Change, Execution, Alter), (Change, Execution, Restart), (Change, Execution, Error), (Change, Execution, Query), (Change, Execution, Invalid), (Change, Execution, Options), (Change, Execution, Isolation), (Change, Execution, Expired), (Change, Execution, Resource), (Change, Execution, PreviousFire), (Change, Execution, TemplateLimit), (Change, Execution, Merge), (Change, Execution, Unknown), (Change, Execution, AlreadyChanged), (Change, Owner, Truncate), (Change, Owner, Insert), (Change, Owner, Update), (Change, Owner, Delete), (Change, Owner, Drop), (Change, Owner, Alter), (Change, Owner, Restart), (Change, Owner, Error), (Change, Owner, Query), (Change, Owner, Invalid), (Change, Owner, Options), (Change, Owner, Isolation), (Change, Owner, Expired), (Change, Owner, Resource), (Change, Owner, PreviousFire), (Change, Owner, TemplateLimit), (Change, Owner, Merge), (Change, Owner, Unknown), (Change, Owner, AlreadyChanged), (Change, Unknown, Truncate), (Change, Unknown, Insert), (Change, Unknown, Update), (Change, Unknown, Delete), (Change, Unknown, Drop), (Change, Unknown, Alter), (Change, Unknown, Restart), (Change, Unknown, Error), (Change, Unknown, Query), (Change, Unknown, Invalid), (Change, Unknown, Options), (Change, Unknown, Isolation), (Change, Unknown, Expired), (Change, Unknown, Resource), (Change, Unknown, PreviousFire), (Change, Unknown, TemplateLimit), (Change, Unknown, Merge), (Change, Unknown, Unknown), (Change, Unknown, AlreadyChanged), (Change, Client, Truncate), (Change, Client, Insert), (Change, Client, Update), (Change, Client, Delete), (Change, Client, Drop), (Change, Client, Alter), (Change, Client, Restart), (Change, Client, Error), (Change, Client, Query), (Change, Client, Invalid), (Change, Client, Options), (Change, Client, Isolation), (Change, Client, Expired), (Change, Client, Resource), (Change, Client, PreviousFire), (Change, Client, TemplateLimit), (Change, Client, Merge), (Change, Client, Unknown), (Change, Client, AlreadyChanged), (Subscribe, Data, Truncate), (Subscribe, Data, Insert), (Subscribe, Data, Update), (Subscribe, Data, Delete), (Subscribe, Data, Drop), (Subscribe, Data, Alter), (Subscribe, Data, Restart), (Subscribe, Data, Error), (Subscribe, Data, Query), (Subscribe, Data, Invalid), (Subscribe, Data, Options), (Subscribe, Data, Isolation), (Subscribe, Data, Expired), (Subscribe, Data, Resource), (Subscribe, Data, PreviousFire), (Subscribe, Data, TemplateLimit), (Subscribe, Data, Merge), (Subscribe, Data, Unknown), (Subscribe, Data, AlreadyChanged), (Subscribe, Timeout, Truncate), (Subscribe, Timeout, Insert), (Subscribe, Timeout, Update), (Subscribe, Timeout, Delete), (Subscribe, Timeout, Drop), (Subscribe, Timeout, Alter), (Subscribe, Timeout, Restart), (Subscribe, Timeout, Error), (Subscribe, Timeout, Query), (Subscribe, Timeout, Invalid), (Subscribe, Timeout, Options), (Subscribe, Timeout, Isolation), (Subscribe, Timeout, Expired), (Subscribe, Timeout, Resource), (Subscribe, Timeout, PreviousFire), (Subscribe, Timeout, TemplateLimit), (Subscribe, Timeout, Merge), (Subscribe, Timeout, Unknown), (Subscribe, Timeout, AlreadyChanged), (Subscribe, Object, Truncate), (Subscribe, Object, Insert), (Subscribe, Object, Update), (Subscribe, Object, Delete), (Subscribe, Object, Drop), (Subscribe, Object, Alter), (Subscribe, Object, Restart), (Subscribe, Object, Error), (Subscribe, Object, Query), (Subscribe, Object, Invalid), (Subscribe, Object, Options), (Subscribe, Object, Isolation), (Subscribe, Object, Expired), (Subscribe, Object, Resource), (Subscribe, Object, PreviousFire), (Subscribe, Object, TemplateLimit), (Subscribe, Object, Merge), (Subscribe, Object, Unknown), (Subscribe, Object, AlreadyChanged), (Subscribe, Database, Truncate), (Subscribe, Database, Insert), (Subscribe, Database, Update), (Subscribe, Database, Delete), (Subscribe, Database, Drop), (Subscribe, Database, Alter), (Subscribe, Database, Restart), (Subscribe, Database, Error), (Subscribe, Database, Query), (Subscribe, Database, Invalid), (Subscribe, Database, Options), (Subscribe, Database, Isolation), (Subscribe, Database, Expired), (Subscribe, Database, Resource), (Subscribe, Database, PreviousFire), (Subscribe, Database, TemplateLimit), (Subscribe, Database, Merge), (Subscribe, Database, Unknown), (Subscribe, Database, AlreadyChanged), (Subscribe, System, Truncate), (Subscribe, System, Insert), (Subscribe, System, Update), (Subscribe, System, Delete), (Subscribe, System, Drop), (Subscribe, System, Alter), (Subscribe, System, Restart), (Subscribe, System, Error), (Subscribe, System, Query), (Subscribe, System, Invalid), (Subscribe, System, Options), (Subscribe, System, Isolation), (Subscribe, System, Expired), (Subscribe, System, Resource), (Subscribe, System, PreviousFire), (Subscribe, System, TemplateLimit), (Subscribe, System, Merge), (Subscribe, System, Unknown), (Subscribe, System, AlreadyChanged), (Subscribe, Statement, Truncate), (Subscribe, Statement, Insert), (Subscribe, Statement, Update), (Subscribe, Statement, Delete), (Subscribe, Statement, Drop), (Subscribe, Statement, Alter), (Subscribe, Statement, Restart), (Subscribe, Statement, Error), (Subscribe, Statement, Query), (Subscribe, Statement, Invalid), (Subscribe, Statement, Options), (Subscribe, Statement, Isolation), (Subscribe, Statement, Expired), (Subscribe, Statement, Resource), (Subscribe, Statement, PreviousFire), (Subscribe, Statement, TemplateLimit), (Subscribe, Statement, Merge), (Subscribe, Statement, Unknown), (Subscribe, Statement, AlreadyChanged), (Subscribe, Environment, Truncate), (Subscribe, Environment, Insert), (Subscribe, Environment, Update), (Subscribe, Environment, Delete), (Subscribe, Environment, Drop), (Subscribe, Environment, Alter), (Subscribe, Environment, Restart), (Subscribe, Environment, Error), (Subscribe, Environment, Query), (Subscribe, Environment, Invalid), (Subscribe, Environment, Options), (Subscribe, Environment, Isolation), (Subscribe, Environment, Expired), (Subscribe, Environment, Resource), (Subscribe, Environment, PreviousFire), (Subscribe, Environment, TemplateLimit), (Subscribe, Environment, Merge), (Subscribe, Environment, Unknown), (Subscribe, Environment, AlreadyChanged), (Subscribe, Execution, Truncate), (Subscribe, Execution, Insert), (Subscribe, Execution, Update), (Subscribe, Execution, Delete), (Subscribe, Execution, Drop), (Subscribe, Execution, Alter), (Subscribe, Execution, Restart), (Subscribe, Execution, Error), (Subscribe, Execution, Query), (Subscribe, Execution, Invalid), (Subscribe, Execution, Options), (Subscribe, Execution, Isolation), (Subscribe, Execution, Expired), (Subscribe, Execution, Resource), (Subscribe, Execution, PreviousFire), (Subscribe, Execution, TemplateLimit), (Subscribe, Execution, Merge), (Subscribe, Execution, Unknown), (Subscribe, Execution, AlreadyChanged), (Subscribe, Owner, Truncate), (Subscribe, Owner, Insert), (Subscribe, Owner, Update), (Subscribe, Owner, Delete), (Subscribe, Owner, Drop), (Subscribe, Owner, Alter), (Subscribe, Owner, Restart), (Subscribe, Owner, Error), (Subscribe, Owner, Query), (Subscribe, Owner, Invalid), (Subscribe, Owner, Options), (Subscribe, Owner, Isolation), (Subscribe, Owner, Expired), (Subscribe, Owner, Resource), (Subscribe, Owner, PreviousFire), (Subscribe, Owner, TemplateLimit), (Subscribe, Owner, Merge), (Subscribe, Owner, Unknown), (Subscribe, Owner, AlreadyChanged), (Subscribe, Unknown, Truncate), (Subscribe, Unknown, Insert), (Subscribe, Unknown, Update), (Subscribe, Unknown, Delete), (Subscribe, Unknown, Drop), (Subscribe, Unknown, Alter), (Subscribe, Unknown, Restart), (Subscribe, Unknown, Error), (Subscribe, Unknown, Query), (Subscribe, Unknown, Invalid), (Subscribe, Unknown, Options), (Subscribe, Unknown, Isolation), (Subscribe, Unknown, Expired), (Subscribe, Unknown, Resource), (Subscribe, Unknown, PreviousFire), (Subscribe, Unknown, TemplateLimit), (Subscribe, Unknown, Merge), (Subscribe, Unknown, Unknown), (Subscribe, Unknown, AlreadyChanged), (Subscribe, Client, Truncate), (Subscribe, Client, Insert), (Subscribe, Client, Update), (Subscribe, Client, Delete), (Subscribe, Client, Drop), (Subscribe, Client, Alter), (Subscribe, Client, Restart), (Subscribe, Client, Error), (Subscribe, Client, Query), (Subscribe, Client, Invalid), (Subscribe, Client, Options), (Subscribe, Client, Isolation), (Subscribe, Client, Expired), (Subscribe, Client, Resource), (Subscribe, Client, PreviousFire), (Subscribe, Client, TemplateLimit), (Subscribe, Client, Merge), (Subscribe, Client, Unknown), (Subscribe, Client, AlreadyChanged), (Unknown, Data, Truncate), (Unknown, Data, Insert), (Unknown, Data, Update), (Unknown, Data, Delete), (Unknown, Data, Drop), (Unknown, Data, Alter), (Unknown, Data, Restart), (Unknown, Data, Error), (Unknown, Data, Query), (Unknown, Data, Invalid), (Unknown, Data, Options), (Unknown, Data, Isolation), (Unknown, Data, Expired), (Unknown, Data, Resource), (Unknown, Data, PreviousFire), (Unknown, Data, TemplateLimit), (Unknown, Data, Merge), (Unknown, Data, Unknown), (Unknown, Data, AlreadyChanged), (Unknown, Timeout, Truncate), (Unknown, Timeout, Insert), (Unknown, Timeout, Update), (Unknown, Timeout, Delete), (Unknown, Timeout, Drop), (Unknown, Timeout, Alter), (Unknown, Timeout, Restart), (Unknown, Timeout, Error), (Unknown, Timeout, Query), (Unknown, Timeout, Invalid), (Unknown, Timeout, Options), (Unknown, Timeout, Isolation), (Unknown, Timeout, Expired), (Unknown, Timeout, Resource), (Unknown, Timeout, PreviousFire), (Unknown, Timeout, TemplateLimit), (Unknown, Timeout, Merge), (Unknown, Timeout, Unknown), (Unknown, Timeout, AlreadyChanged), (Unknown, Object, Truncate), (Unknown, Object, Insert), (Unknown, Object, Update), (Unknown, Object, Delete), (Unknown, Object, Drop), (Unknown, Object, Alter), (Unknown, Object, Restart), (Unknown, Object, Error), (Unknown, Object, Query), (Unknown, Object, Invalid), (Unknown, Object, Options), (Unknown, Object, Isolation), (Unknown, Object, Expired), (Unknown, Object, Resource), (Unknown, Object, PreviousFire), (Unknown, Object, TemplateLimit), (Unknown, Object, Merge), (Unknown, Object, Unknown), (Unknown, Object, AlreadyChanged), (Unknown, Database, Truncate), (Unknown, Database, Insert), (Unknown, Database, Update), (Unknown, Database, Delete), (Unknown, Database, Drop), (Unknown, Database, Alter), (Unknown, Database, Restart), (Unknown, Database, Error), (Unknown, Database, Query), (Unknown, Database, Invalid), (Unknown, Database, Options), (Unknown, Database, Isolation), (Unknown, Database, Expired), (Unknown, Database, Resource), (Unknown, Database, PreviousFire), (Unknown, Database, TemplateLimit), (Unknown, Database, Merge), (Unknown, Database, Unknown), (Unknown, Database, AlreadyChanged), (Unknown, System, Truncate), (Unknown, System, Insert), (Unknown, System, Update), (Unknown, System, Delete), (Unknown, System, Drop), (Unknown, System, Alter), (Unknown, System, Restart), (Unknown, System, Error), (Unknown, System, Query), (Unknown, System, Invalid), (Unknown, System, Options), (Unknown, System, Isolation), (Unknown, System, Expired), (Unknown, System, Resource), (Unknown, System, PreviousFire), (Unknown, System, TemplateLimit), (Unknown, System, Merge), (Unknown, System, Unknown), (Unknown, System, AlreadyChanged), (Unknown, Statement, Truncate), (Unknown, Statement, Insert), (Unknown, Statement, Update), (Unknown, Statement, Delete), (Unknown, Statement, Drop), (Unknown, Statement, Alter), (Unknown, Statement, Restart), (Unknown, Statement, Error), (Unknown, Statement, Query), (Unknown, Statement, Invalid), (Unknown, Statement, Options), (Unknown, Statement, Isolation), (Unknown, Statement, Expired), (Unknown, Statement, Resource), (Unknown, Statement, PreviousFire), (Unknown, Statement, TemplateLimit), (Unknown, Statement, Merge), (Unknown, Statement, Unknown), (Unknown, Statement, AlreadyChanged), (Unknown, Environment, Truncate), (Unknown, Environment, Insert), (Unknown, Environment, Update), (Unknown, Environment, Delete), (Unknown, Environment, Drop), (Unknown, Environment, Alter), (Unknown, Environment, Restart), (Unknown, Environment, Error), (Unknown, Environment, Query), (Unknown, Environment, Invalid), (Unknown, Environment, Options), (Unknown, Environment, Isolation), (Unknown, Environment, Expired), (Unknown, Environment, Resource), (Unknown, Environment, PreviousFire), (Unknown, Environment, TemplateLimit), (Unknown, Environment, Merge), (Unknown, Environment, Unknown), (Unknown, Environment, AlreadyChanged), (Unknown, Execution, Truncate), (Unknown, Execution, Insert), (Unknown, Execution, Update), (Unknown, Execution, Delete), (Unknown, Execution, Drop), (Unknown, Execution, Alter), (Unknown, Execution, Restart), (Unknown, Execution, Error), (Unknown, Execution, Query), (Unknown, Execution, Invalid), (Unknown, Execution, Options), (Unknown, Execution, Isolation), (Unknown, Execution, Expired), (Unknown, Execution, Resource), (Unknown, Execution, PreviousFire), (Unknown, Execution, TemplateLimit), (Unknown, Execution, Merge), (Unknown, Execution, Unknown), (Unknown, Execution, AlreadyChanged), (Unknown, Owner, Truncate), (Unknown, Owner, Insert), (Unknown, Owner, Update), (Unknown, Owner, Delete), (Unknown, Owner, Drop), (Unknown, Owner, Alter), (Unknown, Owner, Restart), (Unknown, Owner, Error), (Unknown, Owner, Query), (Unknown, Owner, Invalid), (Unknown, Owner, Options), (Unknown, Owner, Isolation), (Unknown, Owner, Expired), (Unknown, Owner, Resource), (Unknown, Owner, PreviousFire), (Unknown, Owner, TemplateLimit), (Unknown, Owner, Merge), (Unknown, Owner, Unknown), (Unknown, Owner, AlreadyChanged), (Unknown, Unknown, Truncate), (Unknown, Unknown, Insert), (Unknown, Unknown, Update), (Unknown, Unknown, Delete), (Unknown, Unknown, Drop), (Unknown, Unknown, Alter), (Unknown, Unknown, Restart), (Unknown, Unknown, Error), (Unknown, Unknown, Query), (Unknown, Unknown, Invalid), (Unknown, Unknown, Options), (Unknown, Unknown, Isolation), (Unknown, Unknown, Expired), (Unknown, Unknown, Resource), (Unknown, Unknown, PreviousFire), (Unknown, Unknown, TemplateLimit), (Unknown, Unknown, Merge), (Unknown, Unknown, Unknown), (Unknown, Unknown, AlreadyChanged), (Unknown, Client, Truncate), (Unknown, Client, Insert), (Unknown, Client, Update), (Unknown, Client, Delete), (Unknown, Client, Drop), (Unknown, Client, Alter), (Unknown, Client, Restart), (Unknown, Client, Error), (Unknown, Client, Query), (Unknown, Client, Invalid), (Unknown, Client, Options), (Unknown, Client, Isolation), (Unknown, Client, Expired), (Unknown, Client, Resource), (Unknown, Client, PreviousFire), (Unknown, Client, TemplateLimit), (Unknown, Client, Merge), (Unknown, Client, Unknown), (Unknown, Client, AlreadyChanged)

Sources: SqlNotificationType Enumeration, SqlNotificationSource Enumeration, SqlNotificationInfo Enumeration and SqlNotificationType.cs, SqlNotificationInfo.cs, SqlNotificationSource.cs