selectmany

How C# Compiler choose SelectMany when translating LINQ expression?

There are 4 overloaded signatures for Enumerable.SelectMany. To make it simple, we ignore the two signatures with int argument. So we have 2 signatures for SelectMany: public static IEnumerable<TResult> SelectMany<TSource, TResult>( this IEnumerable<TSource> source, Func<TSource, IEnumerable<TResult>> selector ) public static I...

JSF f:selectItem in h:selectManyCheckbox not working in backing bean, but is displayed properly in h:dataTable

Hello everyone. The problem occurs with this code: <h:form> <rich:panel> <f:facet name="header"> <h:selectManyCheckbox title="Select which types of requests you want to see" onchange="submit();" value="#{filterListener.chosenFilters}" id="selectB...

Need to retrieve List of items containing subitems matched with another List

Situation: I have some persons with certain skills and they can/might belong to more than one area. The skills are linked in a seperate table, so are the areas. I get the people list from selecting all persons with a match on each skill and add them to a list where I can use Distinct() to make sure that they dont show up twice. Result...

Difference Between Select and SelectMany

Hi, I've been searching the difference between those two but I couldn't find actually what I want. I need learn the difference when using LINQ To SQL but they all gave me standard array examples. Can some one give a LINQ TO SQL Example to show the difference between Select and Select Many. Thanks in advance. ...

SelectMany in Linq to entity

I was looking at some examples in microsoft site about linq and I see an example that I need to modify! http://msdn.microsoft.com/en-us/vcsharp/aa336758.aspx#SelectManyCompoundfrom3 public void Linq16() { List customers = GetCustomerList(); var orders = from c in customers from o in c.Orders where o.OrderDate >= new Da...

To call SelectMany dynamically in the way of System.Linq.Dynamic

In System.Linq.Dynamic, there are a few methods to form Select, Where and other Linq statements dynamically. But there is no for SelectMany. The method for Select is as the following: public static IQueryable Select(this IQueryable source, string selector, params object[] values) { if (source == null) throw new Argument...

Complex Linq.Dynamic queries

I am trying to figure out how to create some dynamic queries. I have looked at Linq.Dyanmic and it is missing some things that I think I may need. My goal is to essential flatten the relational database, this is for creating searches on the fly by the user, into one object with properties from many different tables/entities. Example: ...

How to dynamically refresh h:selectManyCheckbox selectItems

I am trying to implement a scenario using JSF. I have a commandExButton and when user click this button "A" it shows the panelDialog which contains the selectManyCheckBox items. I generat these items in the backend bean by parsing one file which is continuously getting updated. What I want is, whenever I click this button "A" I should ge...