IQueryFilter::SubFields 限制了查询的字段，缺省值为"*"

IQueryFilter::WhereClause 则必须在SubFields限制的字段内进行查询。如果SubFields为"*"，则可以是任意字段。

Getting a reference:

Dim pQueryFilter As IQueryFilter
Set pQueryFilter = New QueryFilter 

Setting the SubFields and WhereClause:

pQueryFilter.SubFields =   "STATE_NAME,POPULATION" 
pQueryFilter.WhereClause = "STATE_NAME = 'California'" 

Using a query filter to search a feature class:

Dim pFeatureCursor As IFeatureCursor
Set pFeatureCursor = pFeatureClass.Search(pQueryFilter, False)

Dim pFeature As IFeature
set pFeature = pFeatureCursor.NextFeature
这个时候得到的pFeature.Value(index)只能在pQueryFilter.SubFields限制的字段取值，反之则出错。

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