承認済みアセットの公開リンクを自動的に作成する

using System.Linq;
using System.Threading.Tasks;

var assetId = Context.TargetId;

// Check if public links don't exist yet
var query = Query.CreateQuery(entities => from e in entities
  where e.DefinitionName == "M.PublicLink"
  && e.Parent("AssetToPublicLink") == assetId.Value
  && e.Property("Resource") == "downloadOriginal"
  && e.Property("IsDisabled") == false
  select e);
query.Take = 1;

var result = await MClient.Querying.QueryIdsAsync(query);
if (result.TotalNumberOfResults > 0)
{
  MClient.Logger.Info("Public links already exist for asset with id '" + assetId + "'");
  return;
}

// Create public links
await CreateForRendition("downloadOriginal", assetId.Value);
MClient.Logger.Info("Created public link 'downloadOriginal' for asset with id '" + assetId + "'");

async Task CreateForRendition(string rendition, long assetId)
{
  var publicLink = await MClient.EntityFactory.CreateAsync("M.PublicLink");

  if (publicLink.CanDoLazyLoading())
  {
    await publicLink.LoadMembersAsync(new PropertyLoadOption("Resource"), new RelationLoadOption("AssetToPublicLink"));
  }

  publicLink.SetPropertyValue("Resource", rendition);

  var relation = publicLink.GetRelation<IChildToManyParentsRelation>("AssetToPublicLink");
  if (relation == null)
  {
    MClient.Logger.Error("Unable to create public link: no AssetToPublicLink relation found.");
    return;
  }

  relation.Parents.Add(assetId);

  await MClient.Entities.SaveAsync(publicLink);
}