IProjectionSnapshot::MapToSourceSnapshot Method (Int32, PositionAffinity)

Visual Studio 2015
 

Maps a position in the projection snapshot to the corresponding position in a source snapshot.

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

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SnapshotPoint MapToSourceSnapshot(
	int position,
	PositionAffinity affinity
)

Parameters

position
Type: System::Int32

The position in the projection snapshot .

affinity
Type: Microsoft.VisualStudio.Text::PositionAffinity

If the mapping is ambiguous (the position lies on a source span seam), 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: Microsoft.VisualStudio.Text::SnapshotPoint

A snapshot point in one of the source snapshots.

Exception Condition
ArgumentOutOfRangeException

position is less than zero or greater than or equal to the length of the snapshot.

InvalidOperationException

The projection snapshot has no source spans.

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.

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