Remove item from list based on condition

Question

I have a struct like this  public struct stuff       public int ID      public int quan     and want to to remove the product where ID is 1  I m trying this currently  prods Remove new stuff  prodID   1     and it s not working  THANKS TO ALL

User · Answer

You could use Linq   var prod   from p in prods            where p ID    1            select p

User · Answer

prods Remove prods Single p  p ID    1     you can t modify collection in foreach  as Vincent suggests

User · Answer

Here is a solution for those  who want to remove it from the database with Entity Framework  prods RemoveWhere s   gt  s ID    1   And the extension method itself  using System  using System Linq  using System Linq Expressions  using Microsoft EntityFrameworkCore   namespace LivaNova NGPDM Client Services Data Extensions       public static class DbSetExtensions               public static void RemoveWhere lt TEntity gt  this DbSet lt TEntity gt  entities  Expression lt Func lt TEntity  bool gt  gt  predicate  where TEntity   class                       var records   entities                  Where predicate                   ToList                if  records Count  gt  0                  entities RemoveRange records                       P S  This simulates the method RemoveAll   that s not available for DB sets of the entity framework

User · Answer

Using linq   prods Remove  prods Single  s   gt  s ID    1        Maybe you even want to use SingleOrDefault   and check if the element exists at all      EDIT  Since stuff is a struct  SingleOrDefault   will not return null  But it will return default  stuff    which will have an ID of 0  When you don t have an ID of 0 for your normal stuff-objects you can query for this ID   var stuffToRemove   prods SingleOrDefault  s   gt  s ID    1   if  stuffToRemove ID    0         prods Remove  stuffToRemove

User · Answer

You can only remove something you have a reference to  So you will have to search the entire list   stuff r  foreach stuff s in prods      if s ID    1          r   s        break        prods Remove r     or  for int i   0  i  lt  prods Length  i          if prods i  ID    1            prods RemoveAt i           break

User · Answer

prods Remove prods Find x   gt  x ID    1

User · Answer

If your collection type is a List lt stuff gt   then the best approach is probably the following   prods RemoveAll s   gt  s ID    1    This only does one pass  iteration  over the list  so should be more efficient than other methods   If your type is more generically an ICollection lt T gt   it might help to write a short extension method if you care about performance  If not  then you d probably get away with using LINQ  calling Where or Single

User · Answer

If you have LINQ   var itemtoremove   prods Where item   gt  item ID    1  First    prods Remove itemtoremove

[c#] Remove item from list based on condition

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