Como listar os formatos de dados em um objeto de dados
Os exemplos a seguir mostram como usar as GetFormats sobrecargas de método obter uma matriz de cadeias de caracteres que denotam cada formato de dados que está disponível em um objeto de dados.
Sobrecarga GetFormats() para todos os formatos de dados
Descrição
O código de exemplo a seguir usa a GetFormats sobrecarga para obter uma matriz de cadeias de caracteres que denotam todos os formatos de dados disponíveis em um objeto de dados (nativo e conversível automaticamente).
Código
DataObject dataObject = new DataObject("Some string data to store...");
// Get an array of strings, each string denoting a data format
// that is available in the data object. This overload of GetDataFormats
// returns all available data formats, native and auto-convertible.
string[] dataFormats = dataObject.GetFormats();
// Get the number of data formats present in the data object, including both
// auto-convertible and native data formats.
int numberOfDataFormats = dataFormats.Length;
// To enumerate the resulting array of data formats, and take some action when
// a particular data format is found, use a code structure similar to the following.
foreach (string dataFormat in dataFormats)
{
if (dataFormat == DataFormats.Text)
{
// Take some action if/when data in the Text data format is found.
break;
}
else if(dataFormat == DataFormats.StringFormat)
{
// Take some action if/when data in the string data format is found.
break;
}
}
Dim dataObject As New DataObject("Some string data to store...")
' Get an array of strings, each string denoting a data format
' that is available in the data object. This overload of GetDataFormats
' returns all available data formats, native and auto-convertible.
Dim dataFormats() As String = dataObject.GetFormats()
' Get the number of data formats present in the data object, including both
' auto-convertible and native data formats.
Dim numberOfDataFormats As Integer = dataFormats.Length
' To enumerate the resulting array of data formats, and take some action when
' a particular data format is found, use a code structure similar to the following.
For Each dataFormat As String In dataFormats
If dataFormat = System.Windows.DataFormats.Text Then
' Take some action if/when data in the Text data format is found.
Exit For
ElseIf dataFormat = System.Windows.DataFormats.StringFormat Then
' Take some action if/when data in the string data format is found.
Exit For
End If
Next dataFormat
Sobrecarga GetFormats() para formatos de dados nativos
Descrição
O código de exemplo a seguir usa a GetFormats sobrecarga para obter uma matriz de cadeias de caracteres que indicam apenas formatos de dados disponíveis em um objeto de dados (formatos de dados autoconversíveis são filtrados).
Código
DataObject dataObject = new DataObject("Some string data to store...");
// Get an array of strings, each string denoting a data format
// that is available in the data object. This overload of GetDataFormats
// accepts a Boolean parameter inidcating whether to include auto-convertible
// data formats, or only return native data formats.
string[] dataFormats = dataObject.GetFormats(false /* Include auto-convertible? */);
// Get the number of native data formats present in the data object.
int numberOfDataFormats = dataFormats.Length;
// To enumerate the resulting array of data formats, and take some action when
// a particular data format is found, use a code structure similar to the following.
foreach (string dataFormat in dataFormats)
{
if (dataFormat == DataFormats.Text)
{
// Take some action if/when data in the Text data format is found.
break;
}
}
Dim dataObject As New DataObject("Some string data to store...")
' Get an array of strings, each string denoting a data format
' that is available in the data object. This overload of GetDataFormats
' accepts a Boolean parameter inidcating whether to include auto-convertible
' data formats, or only return native data formats.
Dim dataFormats() As String = dataObject.GetFormats(False) ' Include auto-convertible?
' Get the number of native data formats present in the data object.
Dim numberOfDataFormats As Integer = dataFormats.Length
' To enumerate the resulting array of data formats, and take some action when
' a particular data format is found, use a code structure similar to the following.
For Each dataFormat As String In dataFormats
If dataFormat = System.Windows.DataFormats.Text Then
' Take some action if/when data in the Text data format is found.
Exit For
End If
Next dataFormat
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