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We do not recommend that you access raw fields on the item directly, we recommend to use our api to retrieve metadata.
The api will return a well define When working with metadata through the API, the recommendation is to use the API rather than working with the item directly.
The API returns a well-defined data model of type AssetMetadata which contains the following properties and methods:

Note about mediaFormatId. The valid ids are located at the following path: Sitecore → System → Modules → Digizuite → MetadaraRoot_0 → FormatRoot. It is the complete list of formats available in the Sitecore solution. A format contains different fields for instance MediaFormatId which is the id used in the methods described above.

To see an example of how metadata looks for a specific asset, an admin page has been created. Here all the metadata for a specific asset item can be previewed. It is available on the following path: /sitecore/admin/dfs/GetMetadata.aspx?id=[Item ID]

Below is an example of how it looks:

Image Added

4.1 How to retrieve metadata from an item placed in the silo bucket

In order to retrieve the metadata for the silo item,  call the following pipeline: DFS.GetAssetMetadata
The GetAssetMetadataArgs takes AssetItemId which is of type Sitecore.Data.ID and ContextLanguage which is of type Sitecore.Globalization.Language.

See example below

...

var renderArgs = new GetAssetMetadataArgs { AssetItemId = item.ID, ContextLanguage = Sitecore.Context.Language };
CorePipeline.Run(PipelineNames.GetAssetMetadata, renderArgs);
if (renderArgs.AssetMetadata == null)
{
	return;
}
var name = renderArgs.AssetMetadata.Name;

4.2 How to retrieve metadata for the field type Asset

AssetField assetField = Sitecore.Context.Item.Fields["Asset"]; 
var name = assetField.AssetMetadata.Name; 
var htmlRender = assetField.RenderAsset();

4.

...

3 How to retrieve metadata for the field type AssetLink

AssetlinkField assetLinkField = Sitecore.Context.Item.Fields["AssetLink"]; 
var name = assetLinkField.AssetMetadata.Name; 
var htmlRenderLink = assetLinkField.RenderAsset();

4.

...

4 How to retrieve metadata for the field type AssetList

AssetlistField assetList = Sitecore.Context.Item.Fields["AssetList"];
if (assetList != null)
{
	foreach (var asset in assetList.Assets)
		{
		// To request the rendering html for the asset you call the
		// RenderAsset method. It returns an RenderFieldResult object
		var renderResultItem = asset.RenderAsset(); 
		var title = asset.AssetMetadata.Name;
		var id = asset.AssetMetadata.AssetId;
		var assetTypeId = asset.AssetMetadata.AssetTypeId;
		var assetTypeName = asset.AssetMetadata.AssetTypeName; 


		// Get dynamic metadata
		var someDynamicMetadata = asset.AssetMetadata["50343"];
	}
}

4.

...

5 Update asset metadata not supported from code

Updating an items metadata is not supported from code. Use the editor in the DAM Explorer or Asset browser.