conditional Updating a list using LINQ

Question

I had a list  List lt Myclass gt  li   new List lt Myclass gt       where Myclass is  class Myclass   public string name  get set   public decimal age  get set       items in li looks like     i want to update  li  according to name but with  LINQ  like  li where w  gt  w name    di     li Where w   gt  w name    di   select s   gt   s age   10 return s    Tolist    li where w  gt  w name    marks     li Where w   gt  w name    marks   select s   gt   s age   20 return s    Tolist    li where w  gt  w name    grade     li Where w   gt  w name    grade   select s   gt   s age   10 return s    Tolist      and want result which looks like this    my code gives error can you  please tell how i do this

User · Accepted Answer

cleaner way to do this is using foreach  foreach var item in li Where w   gt  w name    di         item age 10

User · Answer

Try this    li ForEach x   gt  x age    x name     di                     10    x name     marks                     20    x name     grade                     30   0      All values are updated in one line of code and you browse the List only ONE time  You have also a way to set a default value

User · Answer

Try Parallel for longer lists   Parallel ForEach li Where f   gt  f name     di    l   gt  l age   10

User · Answer

How about   from k in myList  where k id  gt  35  select k  ToList   ForEach k   gt  k Name    Banana

User · Answer

You need   li Where w  gt  w name     di   ToList   ForEach i   gt  i age   10     Program code   namespace Test       class Program               class Myclass                       public string name   get  set                public decimal age   get  set                       static void Main string   args                        var list   new List lt Myclass gt    new Myclass name    di   age   0   new Myclass name    marks   age   0   new Myclass name    grade   age   0                list Where w  gt  w name     di   ToList   ForEach i   gt  i age   10               list ForEach i   gt  Console WriteLine i name         i age                        Output    di 10  marks 0  grade 0

User · Answer

li Where w   gt  w name     di               Select s   gt    s age   10  return s                ToList

User · Answer

If you really want to use linq  you can do something like this  li   from tl in li     select new Myclass               name   tl name          age    tl name     di    10    tl name     marks    20   30           ToList      or  li   li Select ex   gt  new MyClass   name   ex name  age    ex name     di    10    ex name     marks    20   30      ToList      This assumes that there are only 3 types of name   I would externalize that part into a function to make it more manageable

[c#] conditional Updating a list using LINQ

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