TextSelection.IsEmpty-Eigenschaft
Aktualisiert: November 2007
Ruft ab, ob der Ankerpunkt dem aktiven Punkt entspricht.
Namespace: EnvDTE
Assembly: EnvDTE (in EnvDTE.dll)
Syntax
ReadOnly Property IsEmpty As Boolean
Dim instance As TextSelection
Dim value As Boolean
value = instance.IsEmpty
bool IsEmpty { get; }
property bool IsEmpty {
bool get ();
}
function get IsEmpty () : boolean
Eigenschaftenwert
Typ: System.Boolean
Ein boolescher Wert, der True lautet, wenn der Ankerpunkt dem aktiven Punkt entspricht, und andernfalls False.
Hinweise
IsEmpty gibt zurück, ob sich der Anker und die aktiven Enden des markierten Textes an derselben Position im Textdokument befinden.
Beispiele
Sub IsEmptyExample()
' Before running this example, open a text document.
Dim objSel As TextSelection = DTE.ActiveDocument.Selection
If objSel.IsEmpty Then
' If there is no text selected, swap the words before and after
' the insertion point. We begin by selecting the word before
' the insertion point.
objSel.WordLeft(True)
If Not objSel.IsEmpty Then
' We can continue only if the selection was not already at
' the beginning of the document.
Dim strBefore As String = objSel.Text
' The text is saved in strBefore; now delete it and move
' past the following word.
objSel.Delete()
objSel.WordRight(True)
If objSel.Text.StartsWith(" ") Or objSel.Text.StartsWith(Microsoft.VisualBasic.ControlChars.Tab) Then
' The previous call to WordRight may have skipped some
' white space instead of an actual word. In that case,
' we should call it again.
objSel.WordRight(True)
End If
' Insert the new text at the end of the selection.
objSel.Insert(strBefore, vsInsertFlags.vsInsertFlagsInsertAtEnd)
End If
Else
' If some text is selected, replace the following word with the
' selected text.
Dim strSelected As String = objSel.Text
objSel.MoveToPoint(objSel.BottomPoint)
objSel.WordRight(True)
If objSel.Text.StartsWith(" ") Or objSel.Text.StartsWith(Microsoft.VisualBasic.ControlChars.Tab) Then
' The previous call to WordRight may have skipped some
' white space instead of an actual word. In that case, we
' should call it again.
objSel.WordRight(True)
End If
' Insert the text, overwriting the existing text and leaving
' the selection containing the inserted text.
objSel.Insert(strSelected, vsInsertFlags.vsInsertFlagsContainNewText)
End If
End Sub
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