Cursors.SyncRoot 屬性

傳回物件，這個物件可用來同步存取 Cursors 集合。

命名空間： Microsoft.Ink
組件： Microsoft.Ink (在 Microsoft.Ink.dll 中)

語法

'宣告
Public ReadOnly Property SyncRoot As Object
'用途
Dim instance As Cursors
Dim value As Object

value = instance.SyncRoot

public Object SyncRoot { get; }

public:
virtual property Object^ SyncRoot {
    Object^ get () sealed;
}

/** @property */
public final Object get_SyncRoot()

public final function get SyncRoot () : Object

屬性值

型別：System.Object
可用來同步存取 Cursors 集合的 System.Object (英文)。

實作

ICollection.SyncRoot

備註

Cursors 集合會實作 System.Collections.ICollection (英文) 介面。如需 SyncRoot 屬性的詳細資訊，請參閱 System.Collections.ICollection.SyncRoot (英文) 屬性。

範例

這個 C# 範例會傳回一份報告，內容是關於做為參數傳入之 InkCollector 物件遭遇的所有游標屬性。在範例中，會示範如何使用集合的 SyncRoot 屬性，實作具備執行緒安全的反覆運算。

using Microsoft.Ink;
//. . .
public string CursorReport(InkCollector theInkCollector)
{
    string theReport = "The InkCollector has encountered the following cursors so far:" + Environment.NewLine;
    // Get the Cursors collection from the InkCollector
    Microsoft.Ink.Cursors theCursors = theInkCollector.Cursors;
    // Prevent changes to the collection while we iterate over it.
    lock( theCursors.SyncRoot )
    {
        theReport += "Count of cursors: " + theCursors.Count + Environment.NewLine + Environment.NewLine ;
        foreach (Microsoft.Ink.Cursor cursor in theCursors)
        {
            theReport += "Cursor Name: " + cursor.Name + Environment.NewLine;
            theReport += "Cursor ToString: " + cursor.ToString() + Environment.NewLine;
            theReport += "Tablet Name: " + cursor.Tablet.Name  + Environment.NewLine;
            theReport += "Cursor Id: " + cursor.Id.ToString()  + Environment.NewLine;
            theReport += "Cursor is inverted: " + cursor.Inverted.ToString()  + Environment.NewLine;
            theReport += "Cursor Buttons:" + Environment.NewLine;
            foreach (CursorButton button in cursor.Buttons)
            {
                CursorButtonState theState = button.State;
                theReport += "    Button Name: " + button.Name + Environment.NewLine;
                theReport += "    State: " + button.State.ToString() + Environment.NewLine;
                theReport += "    Id: " + button.Id.ToString()  + Environment.NewLine + Environment.NewLine;
            }
        }
    }
    return theReport;
}

這個 Microsoft® Visual Basic® .NET 範例會傳回一份報告，內容是關於做為參數傳入之 InkCollector 物件遭遇的所有游標屬性。在範例中，會示範如何使用集合的 SyncRoot 屬性，實作具備執行緒安全的反覆運算。

Imports Microsoft.Ink
'. . .
Public Function CursorReport(ByVal theInkCollector As InkCollector) _
    As String
    Dim theReport As String = "The InkCollector has encountered " & _
        "the following cursors so far:" & vbCrLf
    ' Get the Cursors collection from the InkCollector
    Dim theCursors As Microsoft.Ink.Cursors = theInkCollector.Cursors
    ' Prevent changes to the collection while we iterate over it.
    SyncLock theCursors.SyncRoot
        theReport &= "Count of cursors: " & theCursors.Count & vbCrLf
        Dim theCursor As Microsoft.Ink.Cursor
        For Each theCursor In theCursors
            theReport &= "Cursor Name: " & theCursor.Name & vbCrLf
            theReport &= "Cursor ToString: " & theCursor.ToString() & _
                vbCrLf
            theReport &= "Tablet Name: " & theCursor.Tablet.Name & vbCrLf
            theReport &= "Cursor Id: " & theCursor.Id.ToString() & vbCrLf
            theReport &= "Cursor is inverted: " & _
                theCursor.Inverted.ToString() & vbCrLf
            theReport &= "Cursor Buttons:" & vbCrLf
            Dim theButton As CursorButton
            For Each theButton In theCursor.Buttons
                Dim theState As CursorButtonState = theButton.State
                theReport &= "    Button Name: " & theButton.Name & vbCrLf
                theReport &= "    State: " & _
                    theButton.State.ToString() & vbCrLf
                theReport &= "    Id: " & theButton.Id.ToString() & _
                    vbCrLf & vbCrLf
            Next
        Next
    End SyncLock
    Return theReport
End Function