Clipboard.IsCurrent(IDataObject) 方法

定義

命名空間:

System.Windows

組件:

PresentationCore.dll

比較指定的資料物件與剪貼簿的內容。

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

參數

data

IDataObject

要與系統剪貼簿的內容比較的資料物件。

傳回

Boolean

如果指定的資料物件符合系統剪貼簿上的內容，則為 true，否則為 false。

例外狀況

ArgumentNullException

data 為 null。

ExternalException

存取剪貼簿時發生錯誤。 例外狀況詳細資料將包括識別特定錯誤的 HResult，請參閱 ErrorCode。

範例

下列範例示範如何使用這個方法。

               // 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)

備註

使用這個方法來判斷先前放在剪貼簿上的資料物件是否存在且未修改。