Select method in List t Collection

Question

I have an asp net application  and now I am using datasets for data manipulation  I recently started to convert this dataset to a List collection  But  in some places it doesn t work  One is that in my old version I am using datarow   drow    dataset datatable select searchcriteria   But in the List collection there is no method available for finding particular values  Is there any way for me to select some values according with my search criteria  I want to know if this is possible  Please help me

User · Answer

Try this   using System Data Linq  var result   from i in list              where i age  gt  45              select i    Using lambda expression please use this Statement   var result   list where i   gt  i age  gt  45

User · Answer

Generic List lt T gt  have the Where lt T gt  Func lt T  Boolean gt   extension method that can be used to filter data   In your case with a row array   var rows   rowsArray Where row   gt  row  LastName   ToString   StartsWith  a       If you are using DataRowCollection  you need to cast it first   var rows   dataTableRows Cast lt DataRow gt    Where row   gt  row  LastName   ToString   StartsWith  a

User · Answer

I have used a script but to make a join  maybe I can help you  string Email   String Join       Emails Where i   gt  i Email        Select i   gt  i Email  Distinct

User · Answer

you can also try  var query   from p in list             where p Age  gt  18             select p

User · Answer

Well  to start with List lt T gt  does have the FindAll and ConvertAll methods - but the more idiomatic  modern approach is to use LINQ      Find all the people older than 30 var query1   list Where person   gt  person Age  gt  30       Find each person s name var query2   list Select person   gt  person Name     You ll need a using directive in your file to make this work   using System Linq    Note that these don t use strings to express predicates and projects - they use delegates  usually created from lambda expressions as above   If lambda expressions and LINQ are new to you  I would suggest you get a book covering LINQ first  such as LINQ in Action  Pro LINQ  C  4 in a Nutshell or my own C  in Depth  You certainly can learn LINQ just from web tutorials  but I think it s such an important technology  it s worth taking the time to learn it thoroughly

[c#] Select method in List<t> Collection

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