| IGroupByCollection Methods | 
The IGroupByCollection type exposes the following members.
| Name | Description | |
|---|---|---|
| AddTEntityField | 
            Adds the passed in entity field instance to the list. Field objects can be added just once.
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| AddRange | 
            Adds the range of IEntityFieldCore fields to the groupbycollection.
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| ContainsTEntityField | 
            Checks if the field is in the list. Does a value compare, not an object reference compare. 
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| GetEntityFieldCore | 
            Returns the IEntityFieldCore part of the field at position index
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| GetEnumerator | Returns an enumerator that iterates through a collection.  (Inherited from IEnumerable.) | |
| GetFieldPersistenceInfo | 
            Returns the IFieldPersistenceInfo part of the field at position index
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| IndexOfTEntityField | 
            Returns the index of the field specified. 
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| InsertTEntityField | 
            Inserts the field passed in on index specified.
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| ReadXml | 
            Deserializes the object data on the xml reader into this instance
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| RemoveTEntityField | 
            Removes the passed in entity field instance. Finds the object to remove using value compare.
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| RemoveAt | 
            Removes the entity field instance at index specified from the collection.
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| ReplaceFieldAtIndex | 
            Replaces the field at the index specified with the field passed in
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| SetFieldPersistenceInfo | 
            Sets the IFieldPersistenceInfo part of the field at position index.
            Adapter specific.
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| ToQueryText | 
            Retrieves a ready to use text representation for the groupby collection
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| ToQueryText(Boolean) | 
            Retrieves a ready to use text representation for the groupby collection.
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| WriteXml | 
            Serializes the object as xml to the writer specified.
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| Name | Description | |
|---|---|---|
| IsEmpty | 
            Determines whether the specified groupbycollection is empty. A null passed in is also considered empty.
              (Defined by ORMClassExtensions.) |