C Linq Map List To Another List This always involves having a method that simply creates a List of the target type runs a foreach loop to add every element of the source List but using the mapping method on each and returning the new list It s feeling pretty repetitive and like there might be something built into the language to do this perhaps in LINQ
3 Answers Sorted by 15 In LINQ Select is synonymous with map in other languages It is called select because the word comes from database terminology but Select is what you want var mappedTypes myCollection Select item new MappedType item Something Share Improve this answer Follow answered Dec 26 2010 at 14 58 Brian Genisio 2 Answers Sorted by 259 You can just use the Select extension method IEnumerable int integers new List int 1 2 3 4 5 IEnumerable string strings integers Select i i ToString Or in LINQ syntax IEnumerable int integers new List int 1 2 3 4 5 var strings from i in integers select i ToString
C Linq Map List To Another List
C Linq Map List To Another List
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Map data from one list to another Rolando Ivan Medrano Chavez 1 Jul 30 2021 11 21 AM Hello I have a problem to assign a list of one type of model to another of another type of model What I need to do is the following From SQL I get a list with the following fields Grupo IdVariable Nombre Operador Condicional In this video I am going to map one model list to another model list using single line of code in Linq
By using a LINQ query you can use a source sequence as input and modify it in many ways to create a new output sequence You can modify the sequence itself without modifying the elements themselves by sorting and grouping But perhaps the most powerful feature of LINQ queries is the ability to create new types 21 I m using Automapper to do some mapping from XSD generated serialization object to more sane POCO s I m having an issue with a particular type of mapping public class SourceOuterObject public SourceSet SourceSet get set public class SourceSet public List SourceObject SourceList get set I want to map this to
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Examples The following example defines a method named PointFToPoint that converts a PointF structure to a Point structure The example then creates a List T of PointF structures creates a Converter PointF Point delegate Converter Of PointF Point in Visual Basic to represent the PointFToPoint method and passes the delegate to the ConvertAll method The ConvertAll method passes each 3 Answers Sorted by 15 While you can refer to the list within the delegate it s not generally a good idea You really want to use the overload of Select which provides the index as well as the value var dictionary list Select value index new value index ToDictionary p p value p p index
Projection refers to the operation of transforming an object into a new form that often consists only of those properties that will be subsequently used By using projection you can construct a new type that is built from each object You can project a property and perform a mathematical function on it The selected genres will be returned as a string array which need to be compared against the genre column Or you could use a LINQ filter Using a LINQ filter To use a LINQ filter to compare the data create a query like this var filter new Action Animation Comedy GetMovies Where movie movie Genre Split
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C Linq Map List To Another List - The term LINQ to Objects refers to the use of LINQ queries with any IEnumerable or IEnumerable T collection directly without the use of an intermediate LINQ provider or API such as LINQ to SQL or LINQ to XML You can use LINQ to query any enumerable collections such as List T Array or Dictionary TKey TValue