public async IAsyncEnumerable <T> DownloadAsync(string?whereClause = null, string?extraParameters = null, bool keepQuerying = false)
{
var featureSet = await Esri.GetFeatureSet(Url, Token, typeof(T).HasGeometry(), LayerInfo.hasZ, whereClause, extraParameters, null);
foreach (var graphic in featureSet.features)
{
yield return(graphic.ToFeature <T>(LayerInfo));
}
var objectIds = featureSet.features.Select(g => g.attributes[LayerInfo.GetObjectIdFieldName()].GetInt32()).ToArray();
if (!keepQuerying || objectIds.Length == 0)
{
yield break;
}
var oidSet = await Esri.GetOIDSet(Url, Token, whereClause, extraParameters);
var remainingObjectIds = oidSet.objectIds.Except(objectIds);
await foreach (var feature in DownloadAsync(remainingObjectIds, whereClause, extraParameters, LayerInfo.maxRecordCount ?? objectIds.Length))
{
yield return(feature);
}
}
private IEnumerable <T> Download(IEnumerable <int> objectIds, string?whereClause, string?extraParameters, int batchSize, int degreeOfParallelism, CancellationToken?cancellationToken)
{
var returnGeometry = typeof(T).HasGeometry();
return(objectIds.Chunk(batchSize)
.AsParallel()
.AsOrdered()
.WithDegreeOfParallelism(degreeOfParallelism < 1 ? 1 : degreeOfParallelism)
.WithCancellation(cancellationToken ?? CancellationToken.None)
.SelectMany(ids => Esri.GetFeatureSet(Url, Token, returnGeometry, LayerInfo.hasZ, whereClause, extraParameters, ids).Result.features
.Select(g => g.ToFeature <T>(LayerInfo))));
}
private async IAsyncEnumerable <T> DownloadAsync(IEnumerable <int> objectIds, string?whereClause, string?extraParameters, int batchSize)
{
var returnGeometry = typeof(T).HasGeometry();
foreach (var ids in objectIds.Chunk(batchSize))
{
var featureSet = await Esri.GetFeatureSet(Url, Token, returnGeometry, LayerInfo.hasZ, whereClause, extraParameters, ids);
foreach (var graphic in featureSet.features)
{
yield return(graphic.ToFeature <T>(LayerInfo));
}
}
}
public IEnumerable <T> Download(string?whereClause = null, string?extraParameters = null, bool keepQuerying = false, int degreeOfParallelism = 1, CancellationToken?cancellationToken = null)
{
var featureSet = Esri.GetFeatureSet(Url, Token, typeof(T).HasGeometry(), LayerInfo.hasZ, whereClause, extraParameters, null).Result;
foreach (var g in featureSet.features)
{
yield return(g.ToFeature <T>(LayerInfo));
}
var objectIds = featureSet.features.Select(g => g.attributes[LayerInfo.GetObjectIdFieldName()].GetInt32()).ToArray();
if (!keepQuerying || objectIds.Length == 0)
{
yield break;
}
var remainingObjectIds = Esri.GetOIDSet(Url, Token, whereClause, extraParameters).Result.objectIds.Except(objectIds);
foreach (var f in Download(remainingObjectIds, whereClause, extraParameters, LayerInfo.maxRecordCount ?? objectIds.Length, degreeOfParallelism, cancellationToken))
{
yield return(f);
}
}