public Expression Combine <T>(ExpressionType expressionType,
ParameterExpression parameter,
params Expression <Func <T, bool> >[] conditions)
{
var updatedConditionBodies = conditions
.Select(c => ReplaceParameterVisitor
.GetBodyWithNewParameter <T>(c, parameter));
var root = AggregateWithPrevious(updatedConditionBodies,
expressionType);
return(root);
}
public static Expression GetBodyWithNewParameter <T>(
Expression <Func <T, bool> > expression,
ParameterExpression parameter)
{
if (parameter.Type != typeof(T))
{
throw new ArgumentException($@"The parameter type {parameter.Type.Name} is not valid for the provided expression");
}
var visitor = new ReplaceParameterVisitor(
expression.Parameters.First(), parameter);
return(visitor.Visit(expression.Body));
}