How to specify generic type c?

Question

I tried to indicate this general, but I get a few errors:

public void AddOrUpdate(T item, V repo) where T: IAuditableTable, V: IAzureTable<TableServiceEntity> { try { V.AddOrUpdate(item); } catch (Exception ex) { _ex.Errors.Add("", "Error when adding account"); throw _ex; } } 

For example, ":" immediately after V on the first line produces an error:

 Error 3 ; expected 

plus other errors:

 Error 2 Constraints are not allowed on non-generic declarations Error 6 Invalid token ')' in class, struct, or interface member declaration Error 5 Invalid token '(' in class, struct, or interface member declaration Error 7 A namespace cannot directly contain members such as fields or methods Error 8 Type or namespace definition, or end-of-file expected 

Is there something clearly wrong with my shared code?

Update:

I made changes, and now the code looks like this:

 public void AddOrUpdate<T, V>(T item, V repo) where T : Microsoft.WindowsAzure.StorageClient.TableServiceEntity where V : IAzureTable<TableServiceEntity> { try { repo.AddOrUpdate(item); } catch (Exception ex) { _ex.Errors.Add("", "Error when adding account"); throw _ex; } } 

Calling it from a derived class:

  public void AddOrUpdate(Account account) { base.AddOrUpdate<Account, IAzureTable<Account>>(account, _accountRepository); } 

Answer 1

You will need a second where for V :

 public void AddOrUpdate<T, V>(T item, V repo) where T : IAuditableTable where V : IAzureTable<TableServiceEntity> 

Each where lists the restrictions for one type parameter. Please note that I added type parameters to the method, otherwise the compiler will look for T and V as normal types and will not understand why you tried to restrict them.

Answer 2

A few things seem wrong.

1) As @Jon said, you need separate where clauses

2) You need to determine the generics of the method:

 public void AddOrUpdate<T,V>(T item, V repo) where .... 

3) You are trying to call a method of type V , not an instance of this type of repo . those. this is:

 V.AddOrUpdate(item); 

it should be

 repo.AddOrUpdate(item);