| handler | Callback to handle the operation. Takes a TFilterVariable (the value returned by the filter handler, it will vary for each element), a TFilterConstant (right-hand side value of the operator, which is constant), and a StringComparison option and returns a boolean indicating if the filter passes or not. |
QueryFilterOperator The current QueryFilterOperator.
Adds a custom filter operator handler.
<TFilterVariable>: The type of the operator's left-hand side operand. This is the type returned by a filter handler.
<TFilterConstant>: The type of the operator's right-hand side operand.
An operator handler is a function that is executed for a particular operator (for example "=") with specific type requirements. The operator handler is chosen by the return value of the filter handler (see AddFilter) that is identified when parsing the query, and the type of the filter value.
// Add a new modulo operator on this filter
var op = "%";
queryEngine.TryGetFilter("id", out var filter);
filter.AddOperator(op)
.AddHandler((int ev, int fv) => ev % fv == 0)
.AddHandler((float ev, float fv) => Math.Abs(ev % fv) < 0.00000001f);