灵活掌握Asp.net MVC中GridView的使用方法(2)

public class GridViewModelProvider { internal static CustomersViewModel GetCustomersViewModel(MyDbContext db, PagingInfo PagingData) { int TotalItems = 0; var model = new CustomersViewModel() { Customers = GetResources(db.Customers.AsQueryable(), PagingData, out TotalItems), PagingInfo = new PagingInfo() { CurrentPage = PagingData.CurrentPage, ItemsPerPage = PagingData.ItemsPerPage, PageOptions = new List<int>() { 10, 25, 50, 100 }, ShowPageOptions = true, SearchTerm = PagingData.SearchTerm, Sort = PagingData.Sort, Filters = PagingData.Filters } }; model.PagingInfo.TotalItems = TotalItems; model.JsonPagingInfo = Json.Encode(model.PagingInfo); return model; } private static IQueryable<Customer> GetResources(IQueryable<Customer> Customers, PagingInfo PagingData, out int TotalItems) { var customers = Customers; //search if (!string.IsNullOrEmpty(PagingData.SearchTerm)) { customers = customers.Where(x => (x.CompanyName.Contains(PagingData.SearchTerm) || x.ContactTitle.Contains(PagingData.SearchTerm))); } //filter if (PagingData.Filters != null) { foreach (var filterObj in PagingData.Filters) { switch (filterObj.Column) { case "City": if (filterObj.Value.ToLower() != "all") customers = customers.Where(Extensions.GetWhereClause(filterObj, typeof(string))); break; //Add Other Filter Columns Here } } } TotalItems = customers.Count(); //sort customers = customers.OrderBy(x => x.Id); if (PagingData.Sort != null) { switch (PagingData.Sort.Direction) { case SortDirection.Ascending: if (PagingData.Sort.SortColumn == "CompanyName") { customers = customers.OrderBy(x => x.CompanyName); } else if (PagingData.Sort.SortColumn == "ContactTitle") { customers = customers.OrderBy(x => x.ContactTitle); } break; case SortDirection.Descending: if (PagingData.Sort.SortColumn == "CompanyName") { customers = customers.OrderByDescending(x => x.CompanyName); } else if (PagingData.Sort.SortColumn == "ContactTitle") { customers = customers.OrderByDescending(x => x.ContactTitle); } break; case SortDirection.NotSet: default: break; } } customers = customers .Skip((PagingData.CurrentPage - 1) * PagingData.ItemsPerPage).Take(PagingData.ItemsPerPage); return customers; } }