EncoderParameter Constructor (Encoder, Int64)
Initializes a new instance of the EncoderParameter class with the specified Encoder object and one 64-bit integer. Sets the ValueType property to ValueTypeLong (32 bits), and sets the NumberOfValues property to 1.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- encoder
- Type: System.Drawing.Imaging.Encoder
An Encoder object that encapsulates the globally unique identifier of the parameter category.
- value
- Type: System.Int64
A 64-bit integer that specifies the value stored in the EncoderParameter object. Must be nonnegative. This parameter is converted to a 32-bit integer before it is stored in the EncoderParameter object.
The following code example demonstrates how to create a EncoderParameter using the EncoderParameter constructor. To run this example, paste the code into a Windows Form and call the VaryQualityLevel method from the form's constructor. 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 jgpEncoder = 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", jgpEncoder, myEncoderParameters); myEncoderParameter = new EncoderParameter(myEncoder, 100L); myEncoderParameters.Param[0] = myEncoderParameter; bmp1.Save(@"c:\TestPhotoQualityHundred.jpg", jgpEncoder, 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", jgpEncoder, myEncoderParameters); } ... private ImageCodecInfo GetEncoder(ImageFormat format) { ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders(); foreach (ImageCodecInfo codec in codecs) { if (codec.FormatID == format.Guid) { return codec; } } return null; }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
