'宣言 Public Function IsAsyncOperationActive() As System.Boolean
'使用法 Dim instance As C1PdfDocumentSource Dim value As System.Boolean value = instance.IsAsyncOperationActive()
public System.bool IsAsyncOperationActive()
'宣言 Public Function IsAsyncOperationActive() As System.Boolean
'使用法 Dim instance As C1PdfDocumentSource Dim value As System.Boolean value = instance.IsAsyncOperationActive()
public System.bool IsAsyncOperationActive()