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Returns the ImageDescriptor instance for a known key.
This is an asynchronous operation using the standard naming convention for .NET 4.5 or higher. For .NET 3.5 the operation is implemented as a pair of methods using the standard naming convention of BeginDescriptorFromKey and EndDescriptorFromKey.
public Task<ImageUtilities.ImageDescriptor> DescriptorFromKeyAsync( String key, IAmazonEC2 ec2Client )
The version-independent key identifying the descriptor
Optional. Configured client object from which proxy settings, if needed, can be determined. If no client is supplied the application configuration will be inspected for proxy details. If a proxy is configured (either on the client or in the configuration file) it will be used when downloading the metadata file containing the key to filter mappings.
Supported in: 1.3
Supported in: 4.5