Clipboard.IsCurrent(IDataObject) 方法

定义

命名空间:

System.Windows

程序集:

PresentationCore.dll

比较指定的数据对象与剪贴板的内容。

public:
 static bool IsCurrent(System::Windows::IDataObject ^ data);

public static bool IsCurrent (System.Windows.IDataObject data);

static member IsCurrent : System.Windows.IDataObject -> bool

Public Shared Function IsCurrent (data As IDataObject) As Boolean

参数

data

IDataObject

与系统剪贴板内容相比较的数据对象。

返回

Boolean

如果指定的数据对象与系统剪贴板上的内容相匹配，则为 true，否则为 false。

例外

ArgumentNullException

data 为 null。

ExternalException

访问剪贴板时发生错误。 异常详细信息将包含一个标识特定错误的 HResult；请参见 ErrorCode。

示例

以下示例演示了此方法的使用。

               // For this example, the data to be placed on the clipboard is a simple
               // string.
               string textData = "I want to put this string on the clipboard.";
               // The example will enable auto-conversion of data for this data object.
               bool autoConvert = true;

               // Create a new data object, specifying the data format, data to encapsulate, and enabling
               // auto-conversion services.
               DataObject data = new DataObject(DataFormats.UnicodeText, (Object)textData, autoConvert);
               
               // If the data to be copied is supposed to be persisted after the application ends, 
               // then set the second parameter of SetDataObject to true.
               if(persistentData)
               {
                   // Place the persisted data on the clipboard.
                   Clipboard.SetDataObject(data, true);
               }
               else
               {
                   // Place the non-persisted data on the clipboard.
                   Clipboard.SetDataObject(data, false);
               }

               // If you keep a copy of the source data object, you can use the IsCurrent method to see if
               // the data object is still on the clipboard.
               bool isOriginalDataObject = Clipboard.IsCurrent(data);

' For this example, the data to be placed on the clipboard is a simple
' string.
Dim textData As String = "I want to put this string on the clipboard."
' The example will enable auto-conversion of data for this data object.
Dim autoConvert As Boolean = True

' Create a new data object, specifying the data format, data to encapsulate, and enabling
' auto-conversion services.
Dim data As New DataObject(DataFormats.UnicodeText, CType(textData, Object), autoConvert)

' If the data to be copied is supposed to be persisted after the application ends, 
' then set the second parameter of SetDataObject to true.
If persistentData Then
    ' Place the persisted data on the clipboard.
    Clipboard.SetDataObject(data, True)
Else
    ' Place the non-persisted data on the clipboard.
    Clipboard.SetDataObject(data, False)
End If

' If you keep a copy of the source data object, you can use the IsCurrent method to see if
' the data object is still on the clipboard.
Dim isOriginalDataObject As Boolean = Clipboard.IsCurrent(data)

注解

使用此方法可确定以前放置在剪贴板上的数据对象是否仍然存在且未修改。