AF SDK Reference

Retrieving Values

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Retrieving Values

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Last UpdatedNov 18, 2025
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Retrieving Values

Retrieving values from AF Attributes is also best done in bulk, in particular, if any of the data is coming from the PI Data Archive. By bulk retrieving the data, the calls to the PI Data Archive server can be batched. This example uses the AFAttributeList to illustrate how to retrieve attribute values in bulk.

 1internal static int CountBadData(AFElement element, int depth)
 2{
 3    int count = 0;
 4
 5    // we can use the AFAttributeList to retrieve values from
 6    // multiple attributes at one time.  This is useful when the
 7    // data is coming from a data reference, such as a PI Point, which
 8    // supports retrieving the data in bulk.
 9    AFAttributeList attributes = new AFAttributeList(element.Attributes);
10    AFValues values = attributes.GetValue();
11
12    // count the bad values returned
13    foreach (AFValue v in values)
14    {
15        if (!v.IsGood)
16            count++;
17    }
18
19    // count bad data in child elements too
20    if (depth > 0)
21    {
22        foreach (AFElement childElement in element.Elements)
23        {
24            count += CountBadData(childElement, depth - 1);
25        }
26    }
27
28    return count;
29}

 1Friend Shared Function CountBadData(ByVal element As AFElement, ByVal depth As Integer) As Integer
 2    Dim count As Integer = 0
 3    ' we can use the AFAttributeList to retrieve values from
 4    ' multiple attributes at one time.  This is useful when the
 5    ' data is coming from a data reference, such as a PI Point, which
 6    ' supports retrieving the data in bulk.
 7    Dim attributes As AFAttributeList = New AFAttributeList(element.Attributes)
 8    Dim values As AFValues = attributes.GetValue
 9    ' count the bad values returned
10    For Each v As AFValue In values
11        If Not v.IsGood Then
12            count = (count + 1)
13        End If
14    Next
15    ' count bad data in child elements too
16    If (depth > 0) Then
17        For Each childElement As AFElement In element.Elements
18            count = (count + CountBadData(childElement, (depth - 1)))
19        Next
20    End If
21    Return count
22End Function

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Retrieving Values

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Retrieving Values

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