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We also ensure that we will only search for images. AssetTypes.Image (from Digizuite. Episerver.Constants) is a constant int, set to the default Image Asset Type ID. The view is basically just about rendering the gallery, with the addition of rendering the images in the selected media format as described here: DFO 4.0.0 - 4 Referencing and Rendering Assets. Here is what the end result could look like:
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