Hi,
I tried to get list of parameters from CriteriaOperator with their values and I couldn't do that.I read documentation and I could generate string representation of this operator but I want to get parameter <=> value pairs.Do you have some ideas?
Regards
Hi Jacek.
Please use the static CriteriaOperator.ToString(CriteriaOperator,OperandValue[]) method to accomplish this task. The criteriaParametersList output argument will return a list of all OperandValue (including OperandParameter) instances in the criterion.
UPDATED:
If your criteria doesn't use parameters, but is composed of operators that compare property values with constants, you can write a hierarchy walker or visitor. For example, to extract name-value pars from a group of binary operators, the following code can be used:
C#static Dictionary<string, object> Extract(CriteriaOperator op) {
Dictionary<string, object> dict = new Dictionary<string, object>();
GroupOperator opGroup = op as GroupOperator;
if (ReferenceEquals(opGroup, null)) {
ExtractOne(dict, op);
} else {
if (opGroup.OperatorType == GroupOperatorType.And) {
foreach (var opn in opGroup.Operands) {
ExtractOne(dict, opn);
}
}
}
return dict;
}
private static void ExtractOne(Dictionary<string, object> dict, CriteriaOperator op) {
BinaryOperator opBinary = op as BinaryOperator;
if (ReferenceEquals(opBinary, null)) return;
OperandProperty opProperty = opBinary.LeftOperand as OperandProperty;
OperandValue opValue = opBinary.RightOperand as OperandValue;
if (ReferenceEquals(opProperty, null) || ReferenceEquals(opValue, null)) return;
dict.Add(opProperty.PropertyName, opValue.Value);
}
It is possible to write a hierarchy walker or visitor, but only for a specific subset of criteria operators. For example:
C#static Dictionary<string, object> Extract(CriteriaOperator op) {
Dictionary<string, object> dict = new Dictionary<string, object>();
GroupOperator opGroup = op as GroupOperator;
if (ReferenceEquals(opGroup, null)) {
ExtractOne(dict, op);
} else {
if (opGroup.OperatorType == GroupOperatorType.And) {
foreach (var opn in opGroup.Operands) {
ExtractOne(dict, opn);
}
}
}
return dict;
}
private static void ExtractOne(Dictionary<string, object> dict, CriteriaOperator op) {
BinaryOperator opBinary = op as BinaryOperator;
if (ReferenceEquals(opBinary, null)) return;
OperandProperty opProperty = opBinary.LeftOperand as OperandProperty;
OperandValue opValue = opBinary.RightOperand as OperandValue;
if (ReferenceEquals(opProperty, null) || ReferenceEquals(opValue, null)) return;
dict.Add(opProperty.PropertyName, opValue.Value);
}
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