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valid data type web method parameters???

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.Dat aView 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
Nov 21 '05 #1
1 3612
> 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.Dat aView 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?


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
Nov 21 '05 #2

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