The following procedure demonstrates how to create a list repository.

To create a list repository

1. In Visual Studio, add a reference to the SharePoint Guidance Library Microsoft.Practices.SPG.Common.dll. If you are writing a feature receiver, item event receiver, workflow or anything else that must be in the global assembly cache, then the Microsoft.Practices.SPG.Common assembly also needs to be in the global assembly cache.
2. Define a class for the business entity that corresponds to the content type fields. For information on how to create a content type and associate the content type to a list instance, see Content Types.

   The following code shows an example of this step.

   C#

   public class Customer
   {
      public string CustomerId { get; set;}
      public string Name { get; set;}
      public int SalesTerritoryZone { get; set; }
   }

3. Define a static class that contains the SharePoint field IDs for the list you want to use.

   The following code shows an example of this step.

   C#

   public static class CustomerFieldIds
   {
     public static readonly Guid IdFieldId = 
                                new Guid("3c9699e9-2f9b-4cd6-845e-76c7e58d129a");
   
     public static readonly Guid NameFieldId = 
                                new Guid("84267e40-7f47-4f40-b3be-4004312eb467");
   
     public static readonly Guid TerritoryZoneFieldId = 
                                new Guid("7106DC30-31D9-420d-969F-24A22B7AB7CD");
   }

4. Define a repository class and create an instance of the ListItemFieldMapper class as a member. In the repository's constructor, add mappings that associate the field IDs of the content type to the corresponding property of the business entity. Use a string to represent the name of the business entity property. The following code shows an example.
   C#

   public class CustomerRepository: ICustomerRepository
   {
      ListItemFieldMapper<Customer> listItemFieldMapper = 
                            new ListItemFieldMapper<Customer>();
   
       public CustomerRepository()
       {
         listItemFieldMapper.AddMapping(
                                 CustomerFieldIds.IdFieldId, 
                                 "CustomerId");
   
         listItemFieldMapper.AddMapping(
                                 CustomerFieldIds.NameFieldId, 
                                 "Name");
   
         listItemFieldMapper.AddMapping(
                                 CustomerFieldIds.TerritoryZoneFieldId, 
                                 "SalesTerritoryZone");
       }
   }

Home page on MSDN | Community site