valid data type web method parameters???

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Will - 21 Nov 2004 03:29 GMT

I have a web method in my web service that I would to have a command object
passed in as a parameter. But when I compile the service I get the following
error:

You must implement the Add(System.Data.DataRowView) method on
System.Data.DataView because it inherits from ICollection.

If I replace the parameter's data type to a string, it compiles. Do web
services only allow certain data types to be passed to web methods?

Wll

Reply to this Message

Drew Marsh - 21 Nov 2004 19:54 GMT

> I have a web method in my web service that I would to have a command
> object passed in as a parameter. But when I compile the service I get
[quoted text clipped - 6 lines]
> web services only allow certain data types to be passed to web
> methods?

Yes, those types must be serializable according to the XmlSerializer classes rules. Specifically this rule is saying that because DataView is an ICollection subtype, in order for the XmlSerializer to be able to add child elements to this collection, DataView needs to support an Add method. Obviously it does not and since you don't own the class there's not really any way to ever add it.

DataSet is really the only System.Data class specifically designed to be aware of serializing itself. That said, you might want to skim the newsgroups for recent discussions about the pitfalls of using them.

HTH,
Drew

Reply to this Message

valid data type web method parameters???

Free Magazines