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Cara: Mengambil Data dalam Format Data Tertentu

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Contoh berikut menunjukkan cara mengambil data dari objek data dalam format tertentu.

Gunakan kelebihan beban GetDataPresent(String) untuk mengambil data

Deskripsi

Contoh kode berikut menggunakan GetDataPresent(String) kelebihan beban untuk terlebih dahulu memeriksa apakah format data tertentu tersedia (secara asli atau dengan konversi otomatis); jika format yang ditentukan tersedia, contoh mengambil data dengan menggunakan GetData(String) metode .

Kode

DataObject dataObject = new DataObject("Some string data to store...");

string desiredFormat = DataFormats.UnicodeText;
byte[] data = null;

// Use the GetDataPresent method to check for the presence of a desired data format.
// This particular overload of GetDataPresent looks for both native and auto-convertible
// data formats.
if (dataObject.GetDataPresent(desiredFormat))
{
    // If the desired data format is present, use one of the GetData methods to retrieve the
    // data from the data object.
    data = dataObject.GetData(desiredFormat) as byte[];
}

Dim dataObject As New DataObject("Some string data to store...")

Dim desiredFormat As String = DataFormats.UnicodeText
Dim data() As Byte = Nothing

' Use the GetDataPresent method to check for the presence of a desired data format.
' This particular overload of GetDataPresent looks for both native and auto-convertible 
' data formats.
If dataObject.GetDataPresent(desiredFormat) Then
    ' If the desired data format is present, use one of the GetData methods to retrieve the
    ' data from the data object.
    data = TryCast(dataObject.GetData(desiredFormat), Byte())
End If

Gunakan kelebihan beban GetDataPresent(String, Boolean) untuk mengambil data

Deskripsi

Contoh kode berikut menggunakan GetDataPresent(String, Boolean) kelebihan beban untuk terlebih dahulu memeriksa apakah format data tertentu tersedia secara asli (format data yang dapat dikonversi otomatis difilter); jika format yang ditentukan tersedia, contoh mengambil data dengan menggunakan GetData(String) metode .

Kode

DataObject dataObject = new DataObject("Some string data to store...");

string desiredFormat = DataFormats.UnicodeText;
bool noAutoConvert = false;
byte[] data = null;

// Use the GetDataPresent method to check for the presence of a desired data format.
// The autoconvert parameter is set to false to filter out auto-convertible data formats,
// returning true only if the specified data format is available natively.
if (dataObject.GetDataPresent(desiredFormat, noAutoConvert))
{
    // If the desired data format is present, use one of the GetData methods to retrieve the
    // data from the data object.
    data = dataObject.GetData(desiredFormat) as byte[];
}

Dim dataObject As New DataObject("Some string data to store...")

Dim desiredFormat As String = DataFormats.UnicodeText
Dim noAutoConvert As Boolean = False
Dim data() As Byte = Nothing

' Use the GetDataPresent method to check for the presence of a desired data format.
' The autoconvert parameter is set to false to filter out auto-convertible data formats,
' returning true only if the specified data format is available natively.
If dataObject.GetDataPresent(desiredFormat, noAutoConvert) Then
    ' If the desired data format is present, use one of the GetData methods to retrieve the
    ' data from the data object.
    data = TryCast(dataObject.GetData(desiredFormat), Byte())
End If

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