An ImageType Enumeration value specifying the format of the image to return. Optional. The default value is ImageType.Default, which means the default changes depending on the map style specified. Set this property before making a service request.
public ImageType ImageType { set; get; }
The default value of the ImageType property is ImageType.Default. This means that if the MapUriOptions.Style Property is set to:
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MapStyle.Road, then the ImageType property will default to Png.
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MapStyle.Aerial, then the ImageType property will default to Jpeg.
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MapStyle.AerialWithLabels, then the ImageType property will default to Jpeg.
Reference
MapStyle Enumeration