linq what is => symbol RSS

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  winseealn@ho...

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  linq what is => symbol

  Jul 24, 2012 06:00 AM|LINK

  hi all,

  in LINQ to SQL Database, while doing update like below, here my doubt is what is this symbol =>?

  AdventureWorksDataContext db = new AdventureWorksDataContext();
  db.Log = Console.Out;
  
  // LINQ query to get StateProvince
  StateProvince state = (from states in db.StateProvinces
                         where states.CountryRegionCode == "AU" && states.StateProvinceCode == "NSW"
                         select states).FirstOrDefault();
  // LINQ function to get AddressType
  AddressType addrType = db.AddressTypes.FirstOrDefault(s => s.Name == "Home");
  
  Customer newCustomer = new Customer()
  {
      ModifiedDate= DateTime.Now,
      AccountNumber= "AW12354", 
      CustomerType='I',
      rowguid= Guid.NewGuid(),
      TerritoryID= state.TerritoryID    // Relate record by Keys
  };
  Contact newContact = new Contact()
  {
      Title = "Mr",
      FirstName = "New",
      LastName = "Contact",
      EmailAddress = "newContact@company.com",
      Phone = "(12) 3456789", 
      PasswordHash= "xxx",
      PasswordSalt= "xxx",
      rowguid = Guid.NewGuid(),
      ModifiedDate = DateTime.Now
  };

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  Rohit Rao

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  1869 Points

  357 Posts

  Re: linq what is => symbol

  Jul 24, 2012 06:08 AM|LINK

   the => symbol implies that the word preceding the => is a placeholder variable. For each object in the original collection, a reference to that object will be placed into the placeholder variable, the code to the right of the => symbol will be executed, and the result will be used to build the new collection or to compute a value.

  
  

  refer following link for more information :

   http://www.informit.com/articles/article.aspx?p=1397803

  Don't forget to Mark As Answer if it helps you.
  
  
  • Edited by Rohit Rao on Jul 24, 2012 06:08 AM
  • Marked as answer by winseealn@hotmail.com on Jul 24, 2012 06:25 AM
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  karthicks

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  Re: linq what is => symbol

  Jul 24, 2012 06:08 AM|LINK

  hi, It's Called Lambda Expression

  Refer : http://msdn.microsoft.com/en-us/library/bb397687.aspx

  http://www.codeproject.com/Articles/24255/Exploring-Lambda-Expression-in-C

  http://www.dotnetperls.com/lambda

  http://blogs.msdn.com/b/ericwhite/archive/2006/10/03/lambda-expressions.aspx

  Thanks,
  Karthick S
  • Marked as answer by winseealn@hotmail.com on Jul 24, 2012 06:25 AM
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  Saravanan M

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  Re: linq what is => symbol

  Jul 24, 2012 06:14 AM|LINK

  It is lambda operator.

  All lambda expressions use the lambda operator =>, which is read as "goes to".

  Lambda Expressions

  'Mark as Answer' on the post If it helps, it makes us feel good about ourselves.