EncoderParameters EncoderParameters EncoderParameters EncoderParameters Constructors

Definition

Überlädt

EncoderParameters() EncoderParameters() EncoderParameters()

Initialisiert eine neue Instanz der EncoderParameters-Klasse, die ein EncoderParameter-Objekt enthalten kann.Initializes a new instance of the EncoderParameters class that can contain one EncoderParameter object.

EncoderParameters(Int32) EncoderParameters(Int32) EncoderParameters(Int32) EncoderParameters(Int32)

Initialisiert eine neue Instanz der EncoderParameters-Klasse, die die angegebene Anzahl von EncoderParameter-Objekten enthalten kann.Initializes a new instance of the EncoderParameters class that can contain the specified number of EncoderParameter objects.

EncoderParameters() EncoderParameters() EncoderParameters()

Initialisiert eine neue Instanz der EncoderParameters-Klasse, die ein EncoderParameter-Objekt enthalten kann.Initializes a new instance of the EncoderParameters class that can contain one EncoderParameter object.

public:
 EncoderParameters();
public EncoderParameters ();
Public Sub New ()

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie zum Erstellen und Verwenden einer EncoderParameters Objekt.The following code example demonstrates how to create and use a EncoderParameters object. Um dieses Beispiel auszuführen, fügen Sie den Code in einem Windows Form, und rufen die VaryQualityLevel Methode aus dem Konstruktor des Formulars.To run this example, paste the code into a Windows Form and call the VaryQualityLevel method from the form's constructor. Dieses Beispiel erfordert eine Bilddatei namens TestPhoto.jpg am c:\.This example requires an image file named TestPhoto.jpg located at c:\.

private void VaryQualityLevel()
{
    // Get a bitmap.
    Bitmap bmp1 = new Bitmap(@"c:\TestPhoto.jpg");
    ImageCodecInfo jpgEncoder = GetEncoder(ImageFormat.Jpeg);

    // Create an Encoder object based on the GUID
    // for the Quality parameter category.
    System.Drawing.Imaging.Encoder myEncoder =
        System.Drawing.Imaging.Encoder.Quality;

    // Create an EncoderParameters object.
    // An EncoderParameters object has an array of EncoderParameter
    // objects. In this case, there is only one
    // EncoderParameter object in the array.
    EncoderParameters myEncoderParameters = new EncoderParameters(1);

    EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, 50L);
    myEncoderParameters.Param[0] = myEncoderParameter;
    bmp1.Save(@"c:\TestPhotoQualityFifty.jpg", jpgEncoder, myEncoderParameters);

    myEncoderParameter = new EncoderParameter(myEncoder, 100L);
    myEncoderParameters.Param[0] = myEncoderParameter;
    bmp1.Save(@"c:\TestPhotoQualityHundred.jpg", jpgEncoder, myEncoderParameters);

    // Save the bitmap as a JPG file with zero quality level compression.
    myEncoderParameter = new EncoderParameter(myEncoder, 0L);
    myEncoderParameters.Param[0] = myEncoderParameter;
    bmp1.Save(@"c:\TestPhotoQualityZero.jpg", jpgEncoder, myEncoderParameters);

}
Private Sub VaryQualityLevel()
    ' Get a bitmap.
    Dim bmp1 As New Bitmap("c:\TestPhoto.jpg")
    Dim jpgEncoder As ImageCodecInfo = GetEncoder(ImageFormat.Jpeg)

    ' Create an Encoder object based on the GUID
    ' for the Quality parameter category.
    Dim myEncoder As System.Drawing.Imaging.Encoder = System.Drawing.Imaging.Encoder.Quality

    ' Create an EncoderParameters object.
    ' An EncoderParameters object has an array of EncoderParameter
    ' objects. In this case, there is only one
    ' EncoderParameter object in the array.
    Dim myEncoderParameters As New EncoderParameters(1)

    Dim myEncoderParameter As New EncoderParameter(myEncoder, 50&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityFifty.jpg", jpgEncoder, myEncoderParameters)

    myEncoderParameter = New EncoderParameter(myEncoder, 100&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityHundred.jpg", jpgEncoder, myEncoderParameters)

    ' Save the bitmap as a JPG file with zero quality level compression.
    myEncoderParameter = New EncoderParameter(myEncoder, 0&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityZero.jpg", jpgEncoder, myEncoderParameters)

End Sub 'VaryQualityLevel

private ImageCodecInfo GetEncoder(ImageFormat format)
{
    ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

    foreach (ImageCodecInfo codec in codecs)
    {
        if (codec.FormatID == format.Guid)
        {
            return codec;
        }
    }
    
    return null;
}
Private Function GetEncoder(ByVal format As ImageFormat) As ImageCodecInfo

    Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()

    Dim codec As ImageCodecInfo
    For Each codec In codecs
        If codec.FormatID = format.Guid Then
            Return codec
        End If
    Next codec
    Return Nothing

End Function

Hinweise

Einige der Save und SaveAdd Methoden erhalten eine EncoderParameters Objekt als Argument.Some of the Save and SaveAdd methods receive an EncoderParameters object as an argument. Die GetEncoderParameterList Methode gibt ein EncoderParameters Objekt.The GetEncoderParameterList method returns an EncoderParameters object.

EncoderParameters(Int32) EncoderParameters(Int32) EncoderParameters(Int32) EncoderParameters(Int32)

Initialisiert eine neue Instanz der EncoderParameters-Klasse, die die angegebene Anzahl von EncoderParameter-Objekten enthalten kann.Initializes a new instance of the EncoderParameters class that can contain the specified number of EncoderParameter objects.

public:
 EncoderParameters(int count);
public EncoderParameters (int count);
new System.Drawing.Imaging.EncoderParameters : int -> System.Drawing.Imaging.EncoderParameters
Public Sub New (count As Integer)

Parameter

count
Int32 Int32 Int32 Int32

Eine ganze Zahl, die die Anzahl von EncoderParameter-Objekten angibt, die das EncoderParameters-Objekt enthalten kann.An integer that specifies the number of EncoderParameter objects that the EncoderParameters object can contain.

Gilt für: