IProjectionSnapshot.MapFromSourceSnapshot Method (SnapshotPoint, PositionAffinity)

Artikel
07/31/2012

Maps from a snapshot point in one of the source snapshots to the corresponding position in the projection snapshot.

Namespace: Microsoft.VisualStudio.Text.Projection
Assembly: Microsoft.VisualStudio.Text.Data (in Microsoft.VisualStudio.Text.Data.dll)

Syntax

'Declaration
Function MapFromSourceSnapshot ( _
    point As SnapshotPoint, _
    affinity As PositionAffinity _
) As Nullable(Of SnapshotPoint)

Nullable<SnapshotPoint> MapFromSourceSnapshot(
    SnapshotPoint point,
    PositionAffinity affinity
)

Nullable<SnapshotPoint> MapFromSourceSnapshot(
    SnapshotPoint point, 
    PositionAffinity affinity
)

abstract MapFromSourceSnapshot : 
        point:SnapshotPoint * 
        affinity:PositionAffinity -> Nullable<SnapshotPoint>

function MapFromSourceSnapshot(
    point : SnapshotPoint, 
    affinity : PositionAffinity
) : Nullable<SnapshotPoint>

Parameters

point
Type: Microsoft.VisualStudio.Text.SnapshotPoint
The snapshot point in a source buffer.

affinity
Type: Microsoft.VisualStudio.Text.PositionAffinity
If the mapping is ambiguous (the position lies between two source spans), this parameter affects the mapping as follows:
if affinity is Predecessor, the mapping targets the position immediately after the preceding character in the projection buffer
if affinity is Successor, the mapping targets the position immediately before the following character in the projection buffer
This parameter has no effect if the mapping is unambiguous.

Return Value

Type: System.Nullable<SnapshotPoint>
A position in the projection snapshot, or nulla null reference (Nothing in Visual Basic) if the source point does not correspond to text belonging to a span that is a member of the projection snapshot.

Exceptions

Exception	Condition
ArgumentException	point does not belong to a source snapshot of this projection snapshot.

Remarks

In general, a source span seam occurs at the end of a source span of nonzero length and the beginning of a source span of nonzero length, and coincides with zero or more source spans of zero length. Every span on a seam has a point in the result collection.

.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.

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