Amazon DynamoDBv2 QueryOperationConfig SelectValues.Count not working - .net-core

Question

I have this piece of code like this:
var options = new DynamoDBOperationConfig
{
ConditionalOperator = ConditionalOperatorValues.Or,
OverrideTableName = nameTable,
ConsistentRead = true
};
new QueryOperationConfig()
{
IndexName = indexName,
Filter = queryFilter,
Select = SelectValues.Count
};
result = context.FromQueryAsync<TEntity>(queryConfig, options).GetRemainingAsync().Result;
as per the documentation, it should return just the count of values that match the filter, at least, the piece of code in the SelectValues class says that
//
// Summary:
// An enumeration of all supported Select values for Query and Scan. Value of Count
// will force service to return the number of items, not the items themselves.
but result is always an empty list; how can i make the count work ?

Answer 1

If you are still looking for the answer, this is the solution:
new QueryOperationConfig()
{
IndexName = indexName,
Filter = queryFilter,
Select = SelectValues.Count,
ConsistentRead = true
};
var table = context.GetTargetTable<TEntity>();
var search = table.Query(queryConfig);
result = search.Count;
Having ConsistentRead set to true will cause it to give you real time updates when the table is updated.

Answer 2

It's not working on Document level...
You can try to do this in low level model.
int count = 0;
Dictionary<string, AttributeValue> lastKey = null;
do
{
var request = new QueryRequest
{
TableName = "tableNmae",
IndexName = "indexName",
KeyConditionExpression = "ID= :v_ID",
ExpressionAttributeValues = new Dictionary<string, AttributeValue>
{
{
":v_ID",
new AttributeValue
{
N = "1"
}
}
},
ConsistentRead = false,
Select = Select.COUNT,
ExclusiveStartKey = lastKey
};
var respone = await tableClient.QueryAsync(request);
count += respone.Count;
lastKey = respone.LastEvaluatedKey;
} while (lastKey != null && lastKey.Count != 0);