ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Data.Knowledge Namespace / KnowledgeGraphCursor Class / MoveNext Method
Example

In This Topic
    MoveNext Method (KnowledgeGraphCursor)
    In This Topic
    Advances to the next KnowledgeGraphRow in the graph row cursor. This method must be called on the MCT. Use QueuedTask.Run.
    Syntax
    public bool MoveNext()
    Public Function MoveNext() As Boolean

    Return Value

    True if the cursor has successfully advanced to the next row; false otherwise.
    Exceptions
    ExceptionDescription
    This method or property must be called within the lambda passed to QueuedTask.Run.
    Remarks
    Advance the graph row cursor forward. If MoveNext() returns true, a KnowledgeGraphRow object is created. Even if this row (Current) is not otherwise needed, it should be properly disposed.
    The cursor can only advance sequentially forward. To move the cursor back to the beginning, the query must be re-executed.
    Example
    Submit a Graph Query
    //On the QueuedTask...
    //and assuming you have established a connection to a knowledge graph
    //...
    //Construct an openCypher query - return the first 10 entities (whatever
    //they are...)
    var query = "MATCH (n) RETURN n LIMIT 10";//default limit is 100 if not specified
    //other examples...
    //query = "MATCH (a:Person) RETURN [a.name, a.age] ORDER BY a.age DESC LIMIT 50";
    //query = "MATCH (b:Person) RETURN { Xperson: { Xname: b.name, Xage: b.age } } ORDER BY b.name DESC";
    //query = "MATCH p = (c:Person)-[:HasCar]-() RETURN p ORDER BY c.name DESC";
    
    //Create a query filter
    //Note: OutputSpatialReference is currently ignored
    var kg_qf = new KnowledgeGraphQueryFilter()
    {
      QueryText = query
    };
    //Optionally - u can choose to include provenance in the results
    //(_if_ the KG has provenance - otherwise the query will fail)
    if (includeProvenanceIfPresent)
    {
      //see "Get Whether KG Supports Provenance" snippet
      if (KnowledgeGraphSupportsProvenance(kg))
      {
        //Only include if the KG has provenance
        kg_qf.ProvenanceBehavior =
          KnowledgeGraphProvenanceBehavior.Include;//default is exclude
      }
    }
    //submit the query - returns a KnowledgeGraphCursor
    using (var kg_rc = kg.SubmitQuery(kg_qf))
    {
      //wait for rows to be returned from the server
      //note the "await"...
      while (await kg_rc.WaitForRowsAsync())
      {
        //Rows have been retrieved - process this "batch"...
        while (kg_rc.MoveNext())
        {
          //Get the current KnowledgeGraphRow
          using (var graph_row = kg_rc.Current)
          {
            //Graph row is an array, process all returned values...
            var val_count = (int)graph_row.GetCount();
            for (int i = 0; i < val_count; i++)
            {
              var retval = graph_row[i];
              //Process row value (note: recursive)
              //See "Process a KnowledgeGraphRow Value" snippet
              ProcessKnowledgeGraphRowValue(retval);
            }
          }
        }
      }//WaitForRowsAsync
    }//SubmitQuery
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.2 or higher.
    See Also