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Lightstreamer PCL (Portable Class Libraries) Client 3.0.0
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IUpdateInfo.GetOldValue Method (int)
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Lightstreamer PCL (Portable Class Libraries) Client 3.0.0
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Gets the value for a field as it was before the reception of this update. If the current update is the first one, then all old values are null.
If the "COMMAND logic" behaviour is enabled, then the value is meant as relative to the same key; as a consequence, on ADD commands all old values are null.
string GetOldValue(int fieldPos);
string GetOldValue(int fieldPos);
Function GetOldValue(fieldPos As Integer) As string
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Parameters |
Description |
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int fieldPos |
a 1-based field position within the Schema of fields in the related table. |
the previous field value, according to the above specifications; null is a legal value too.
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Exceptions |
Description |
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ArgumentException |
the specified field position does not represent a subscribed field. |