private static BinaryExpression GetExpression <T>
(ParameterExpression param, PropertyFilter filter1, PropertyFilter filter2)
{
Expression bin1 = GetExpression <T>(param, filter1);
Expression bin2 = GetExpression <T>(param, filter2);
return(Expression.AndAlso(bin1, bin2));
}
private static Expression GetExpression <T>(ParameterExpression param, PropertyFilter filter)
{
MemberExpression member = Expression.Property(param, filter.PropertyName);
ConstantExpression constant = Expression.Constant(filter.Value);
switch (filter.Operator)
{
case Operator.Equal:
return(Expression.Equal(member, constant));
case Operator.NotEqual:
return(Expression.NotEqual(member, constant));
case Operator.GreaterThan:
return(Expression.GreaterThan(member, constant));
case Operator.EqualOrGreaterThan:
return(Expression.GreaterThanOrEqual(member, constant));
case Operator.LessThan:
return(Expression.LessThan(member, constant));
case Operator.EqualOrLessThan:
return(Expression.LessThanOrEqual(member, constant));
case Operator.Like:
return(Expression.Call(member, ContainsMethod, constant));
case Operator.StartsWith:
return(Expression.Call(member, StartsWithMethod, constant));
case Operator.EndsWith:
return(Expression.Call(member, EndsWithMethod, constant));
}
return(null);
}
