GetAsync(Expression<Func<Dictionary<string, object?>, bool>>, int,<Dictionary<string, object?>>?, CancellationToken )

This method retrieves from the vector store records matching a filter expression. It does not guarantee the existence of the collection.

Declaration

// C#
public async IAsyncEnumerable<Dictionary<string, object?>?> GetAsync(Expression<Func<Dictionary<string, object?>, bool>> filter, int top, FilteredRecordRetrievalOptions<Dictionary<string, object?>>? options = null, CancellationToken cancellationToken = default);

Parameter

• filter

  Predicate for filtering the records.

• top

  Maximum number of results to return.

• options

  Optional options for retrieving the records.

• cancellationToken

  The cancellation token.

Return Value

IAsyncEnumerable<Dictionary<string, object?>?> object representing the records matching the provided predicate.

Implements

Microsoft.Extensions.VectorData.VectorStoreCollection

Exceptions

VectorStoreException: The command fails to execute for any reason other than the absence of a record.

Remarks

The filter cannot compare the following unsupported columns types:

• BFile

• Blob

• Clob

• Json

• NClob

• Vector

• Vector_Binary

• Vector_Float32

• Vector_Float64

• Vector_Int8

• XmlType

Unlike OracleCollection , OracleDynamicColloection uses Object as TKey , and Dictionary<string, object?> as TRecord. Ensure to use the correct parameter types for the filter and options: Dictionary<string, object?>.

See Also:

• FilteredRecordRetrievalOptions<TRecord> Class