Cursors.SyncRoot 属性

项目
11/04/2008

返回一个对象，该对象可用于同步对 Cursors 集合的访问。

命名空间： Microsoft.Ink
程序集： Microsoft.Ink（在 Microsoft.Ink.dll 中）

语法

声明
Public ReadOnly Property SyncRoot As Object
用法
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

属性值

类型：System.Object
一个 System.Object，可用于同步对 Cursors 集合的访问。

实现

ICollection.SyncRoot

备注

Cursors 集合实现 System.Collections.ICollection 接口。有关 SyncRoot 属性的更多信息，请参见 System.Collections.ICollection.SyncRoot 属性。

示例

此 C# 示例返回一份报告，其中列出了作为参数传入的 InkCollector 对象所遇到的所有光标的属性。该示例演示如何使用集合的 SyncRoot 属性实现线程安全的迭代。

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;
}

此 Microsoft(R) Visual Basic(R) .NET 示例返回一份报告，其中列出了作为参数传入的 InkCollector 对象所遇到的所有光标的属性。该示例演示如何使用集合的 SyncRoot 属性实现线程安全的迭代。

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