How to set EventFilter WhereClause

[invinctus]

Hi,

I'm trying to add a where clause to an event subscription but I cannot figure out how to set the filter operands. I was expecting to do something like this:

new ContentFilter {
    Elements = new ContentFilterElement[]
    {
        new ContentFilterElement
        {
            FilterOperator = FilterOperator.Equals,
            FilterOperands = new FilterOperand[]{
                new QualifiedName("SourceName"),
                new Variant("CNC")
            }
        }
    }
};

But the FilterOperand class has no properties and I cant figure out how I need to set the operands for the filter.

[awcullen]

Great question. The following should filter the subscription to receive only events with "SourceName" Equals "CNC"

WhereClause = new ContentFilter
{
    Elements = new ContentFilterElement[]
    {
        new ContentFilterElement
        {
            FilterOperator = FilterOperator.Equals,
            FilterOperands = new FilterOperand[]{
                new SimpleAttributeOperand{
                    BrowsePath= new []{ QualifiedName.Parse("SourceName") },
                    AttributeId=AttributeIds.Value
                },
                new LiteralOperand{ Value= new Variant("CNC") }
            }
        }
    }
}

[invinctus]

Yep that does the trick, I was pretty close just missed those sub classes.

Thanks.