IBufferGraph.MapUpToSnapshot Method (SnapshotPoint, PointTrackingMode, PositionAffinity, ITextSnapshot)
Maps a position in the current snapshot of a buffer that is a member of the buffer graph to the specified snapshot.
Namespace: Microsoft.VisualStudio.Text.Projection
Assembly: Microsoft.VisualStudio.Text.Data (in Microsoft.VisualStudio.Text.Data.dll)
Syntax
'宣言
Function MapUpToSnapshot ( _
point As SnapshotPoint, _
trackingMode As PointTrackingMode, _
affinity As PositionAffinity, _
targetSnapshot As ITextSnapshot _
) As Nullable(Of SnapshotPoint)
Nullable<SnapshotPoint> MapUpToSnapshot(
SnapshotPoint point,
PointTrackingMode trackingMode,
PositionAffinity affinity,
ITextSnapshot targetSnapshot
)
Nullable<SnapshotPoint> MapUpToSnapshot(
SnapshotPoint point,
PointTrackingMode trackingMode,
PositionAffinity affinity,
ITextSnapshot^ targetSnapshot
)
abstract MapUpToSnapshot :
point:SnapshotPoint *
trackingMode:PointTrackingMode *
affinity:PositionAffinity *
targetSnapshot:ITextSnapshot -> Nullable<SnapshotPoint>
function MapUpToSnapshot(
point : SnapshotPoint,
trackingMode : PointTrackingMode,
affinity : PositionAffinity,
targetSnapshot : ITextSnapshot
) : Nullable<SnapshotPoint>
Parameters
- point
Type: Microsoft.VisualStudio.Text.SnapshotPoint
A point in some buffer in the IBufferGraph.
- trackingMode
Type: Microsoft.VisualStudio.Text.PointTrackingMode
How point is tracked to the current snapshot if necessary.
- affinity
Type: Microsoft.VisualStudio.Text.PositionAffinity
If the mapping is ambiguous (the position is on a source span seam), determines whether the mapping should target the position immediately after the preceding character or immediately before the following character in the top buffer.
This setting has no effect if the mapping is unambiguous.
- targetSnapshot
Type: Microsoft.VisualStudio.Text.ITextSnapshot
The snapshot to which to map.
Return Value
Type: System.Nullable<SnapshotPoint>
The corresponding position in targetSnapshot, or nulla null reference (Nothing in Visual Basic) if the position does not map to targetSnapshot using this graph.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | point.Snapshot is nulla null reference (Nothing in Visual Basic). |
| ArgumentOutOfRangeException | trackingMode is not a valid PointTrackingMode, or affinity is not a valid PositionAffinity. |
.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.