Question

The first compiles and runs . The second one fails because the method call returns an ICollection.

The following code works fine

foreach (XmlSchema schema in schemaSet.Schemas(targetNamespace)) 
{
    Id = schema.Id;
    Version = schema.Version;             
}

Since I am going to to get only one schema, why not go ahead and do this

XmlSchema schema = schemaSet.Schemas(targetNamespace);
Id = schema.Id;
Version = schema.Version;

There has to be something which is similar to the second one which will work?

How can this be done?

Answer 1

You can use LINQ to make the second one work easily:

XmlSchema schema = schemaSet.Schemas(targetNamespace).Cast<XmlSchema>().Single();
Id = schema.Id;
Version = schema.Version;

If you’re definitely expecting only a single schema, I would definitely opt for using Single() instead of First() – that way if your expectations are ever mistaken, you’ll throw an exception rather than using whichever schema happened to come first out of the unexpectedly-large collection.

The Cast<>() call is required because Schemas() only returns a weakly-typed ICollection rather than an implementation of IEnumerable<XmlSchema>.