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Notification that a series of partition mapping requests are bout to be made for a particular ElementGroupPrototype and merge (or target) partition. This is an opportunity to perform one-off initialization and establish a context for the subsequent mapping calls.
Namespace:  Microsoft.VisualStudio.Modeling
Assembly:  Microsoft.VisualStudio.Modeling.Sdk.12.0 (in Microsoft.VisualStudio.Modeling.Sdk.12.0.dll)
Syntax
'Declaration
Function BeginMapping ( _
    groupPrototype As ElementGroupPrototype, _
    mergePartition As Partition _
) As Object
Object BeginMapping(
    ElementGroupPrototype groupPrototype,
    Partition mergePartition
)
Object^ BeginMapping(
    ElementGroupPrototype^ groupPrototype, 
    Partition^ mergePartition
)
abstract BeginMapping : 
        groupPrototype:ElementGroupPrototype * 
        mergePartition:Partition -> Object
function BeginMapping(
    groupPrototype : ElementGroupPrototype, 
    mergePartition : Partition
) : Object
Parameters
- groupPrototype 
 Type: Microsoft.VisualStudio.Modeling.ElementGroupPrototype- The ElementGroupPrototype that is being, or is to be, reconstituted. 
- mergePartition 
 Type: Microsoft.VisualStudio.Modeling.Partition- The merge target partition. Not necessarily where the elements will be reconstituted. 
Return Value
Type: System.Object
An object, e.g. a cookie or context specific state, that has meaning to the partition mapper.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.