expression

问题 I am using MathDox formula editor to produce MathML. Now I want to convert the MathML produced by MathDox to expression which I can later use to evaluate to find the answer. For eg: MathML: <math xmlns='http://www.w3.org/1998/Math/MathML'> <mrow> <mn>3</mn> <mo>+</mo> <mn>5</mn> </mrow> </math> Want to convert to expression as: 3+5 Now I can use 3+5 to get answer 8. I am in a search of javascript or c# solution for this conversion. Tried to google it, but didn't get much help. Somewhat closer

问题 My system: Ubuntu 9.10. Eclipse 3.5.1 with Java EE 1.2.1 (manual install - NOT from synaptic). Web Developer Tools 3.1.1 I've recently adopted someone else's code (a Dynamic Web Project), and run into lots of errors, warnings and incorrect syntax highlighting in Eclipse. I've narrowed it down to these 4 lines of code (create a new Dynamic Web Project, and then a new JSP page, and put this in the body): ${(1<2)? "" : "no"} <%for (int i = 0; i < 5; i++) {%> <div>${5}</div> <%}%> Errors /

问题 i am leveraging this project to use jqgrid to filter and sort collections. The one missing feature is that this example is not doing case insensitive search which i need. So if a user types in "Test" i want it to match with "TEST", "TeST", etc . . i have code that looks like this: case WhereOperation.Equal: condition = Expression.Equal(memberAccessToString, filter); lambda = Expression.Lambda(condition, parameter); break; case WhereOperation.NotEqual: condition = Expression.NotEqual

问题 I am trying to write a linq to entity extension method that takes a Func to select a property Id and compare it against a list of ids. Classes public class A { public int AId { get; set; } } public class B { public int BId { get; set; } } Extension Method public static IQueryable<T> WithId<T>(this IQueryable<T> entities, Func<T, int> selector, IList<int> ids) { Expression<Func<T, bool>> expression = x => ids.Contains(selector(x)); return entities.Where(expression); // error here (when

问题 I have two lambda expressions: Expression<Func<MyEntity, bool>> e1 = i = >i.FName.Contain("john"); and Expression<Func<MyEntity, bool>> e2 = i => i.LName.Contain("smith"); the i type, comes from my poco entities, that can't used with invoke. I want to combine these in runtime. I want to combine these expressions in runtime in a similar way as: Expression<Func<MyEntity, bool>> e3 = Combine(e1,e2); 回答1: The problem is that you can't just "and"/"or" them, because you need to re-write the

问题 I have this query SELECT DAL_ROWNOTABLE.DAL_ID FROM ( SELECT ticket.id AS "DAL_ID", ROWNUMBER ( Order By ticket.id ) AS "DAL_ROWNUMBER" FROM ticket_table ticket WHERE ( ticket.type = N'I' ) AND ( ticket.tenant IS NULL OR ticket.tenant IN ( SELECT * FROM ( SELECT tenant_group_member.tenant_id FROM tenant_group_member WHERE tenant_group_member.tenant_group = HEXTORAW('30B0716FEB5F4E4BB82A7B7AA3A1A42C') ORDER BY ticket.id ) ) ) ) DAL_ROWNOTABLE WHERE DAL_ROWNOTABLE.DAL_ROWNUMBER BETWEEN 1 AND 21

问题 I need an SSIS expression to get the left part of a string before the separator, and then put the new string in a new column. I checked in derived column, it seems no such expressions. Substring could only return string part with fixed length. For example, with separator string - : Art-Reading Should return Art Art-Writing Should return Art Science-chemistry Should return Science P.S. I knew this could be done in MySQL with SUBSTRING_INDEX() , but I'm looking for an equivalent in SSIS, or at

问题 We use the Shunting-Yard algorithm to evaluate expressions. We can validate the expression by simply applying the algorithm. It fails if there are missing operands, miss-matched parenthesis, and other things. The Shunting-Yard algorithm however has a larger supported syntax than just human readable infix. For example, 1 + 2 + 1 2 1 2 + are all acceptable ways to provide '1+2' as input to the Shunting-Yard algorithm. '+ 1 2' and '1 2 +' are not valid infix, but the standard Shunting-Yard

问题 I have a XHTML form where I ask people to enter their full name. I then match that with preg_match() using this pattern: /^[\p{L}\s]+$/ On my local server running PHP 5.2.13 (PCRE 7.9 2009-04-11) this works fine. On the webhost running PHP 5.2.10 (PCRE 7.3 2007-08-28) it doesn't match when the entered string contains the Danish Latin character ø ( http://www.ltg.ed.ac.uk/~richard/utf-8.cgi?input=%F8&mode=char ). Is this a bug? Is there a work around? Thank you in advance! 回答1: So, the problem

问题 You can use Lambda Expression Objects to represent a lambda as an expression. How do you create a Lambda Expression Object representing a generic method call, if you only know the type -that you use for the generic method signature- at runtime? For example: I want to create a Lambda Expression Objects to call: public static TSource Last<TSource>( this IEnumerable<TSource> source ) But I only know what TSource is at runtime. 回答1: static Expression<Func<IEnumerable<T>, T>> CreateLambda<T>() {