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DataGrid

CRUD Operations

Documentation

This demo shows how to implement remote CRUD operations in the CustomStore. You can view the server implementation under the DataGridWebApiController tab in the ASP.NET MVC version of this demo. The requests sent to the server are displayed under the DataGrid.

After a cell is edited, the DataGrid can behave differently depending on the selected refresh mode: reload data from the server (the refreshMode is full), reapply data processing operations (reshape), or merely rerender the changed cells (repaint).

@(Html.DevExtreme().DataGrid<DevExtreme.NETCore.Demos.Models.Northwind.Order>() .ID("grid") .DataSource(d => d.WebApi() .Controller("DataGridWebApi") .LoadAction("Orders") .InsertAction("InsertOrder") .UpdateAction("UpdateOrder") .DeleteAction("DeleteOrder") .Key("OrderID") .OnBeforeSend("beforeSend") ) .ShowBorders(true) .RepaintChangesOnly(true) .Scrolling(s => s.Mode(GridScrollingMode.Virtual)) .Editing(e => e .Mode(GridEditMode.Cell) .RefreshMode(GridEditRefreshMode.Reshape) .AllowAdding(true) .AllowDeleting(true) .AllowUpdating(true) ) .Columns(columns => { columns.AddFor(m => m.CustomerID) .Lookup(lookup => lookup .DataSource(d => d.WebApi() .Controller("DataGridWebApi") .LoadAction("CustomersLookup") .Key("Value") .OnBeforeSend("beforeSend") ) .DataSourceOptions(o => o.Paginate(true)) .ValueExpr("Value") .DisplayExpr("Text") ); columns.AddFor(m => m.OrderDate); columns.AddFor(m => m.Freight); columns.AddFor(m => m.ShipCountry); columns.AddFor(m => m.ShipVia) .Lookup(lookup => lookup .DataSource(d => d.WebApi() .Controller("DataGridWebApi") .LoadAction("ShippersLookup") .Key("Value") .OnBeforeSend("beforeSend") ) .ValueExpr("Value") .DisplayExpr("Text") ); }) .Summary(s => s .TotalItems(totalItems => { totalItems.AddFor(t => t.CustomerID).SummaryType(SummaryType.Count); totalItems.AddFor(t => t.Freight).ValueFormat("#0.00").SummaryType(SummaryType.Sum); }) ) ) <div class="options"> <div class="caption">Options</div> <div class="option"> <span>Refresh Mode:</span> @(Html.DevExtreme().SelectBox() .ID("refresh-mode") .DataSource(new string[] { "full", "reshape", "repaint" }) .Value("reshape") .OnValueChanged(@<text> function(e) { $("#grid").dxDataGrid("instance").option("editing.refreshMode", e.value); } </text>) ) </div> <div id="requests"> <div> <div class="caption">Network Requests</div> @(Html.DevExtreme().Button() .ID("clear") .Text("Clear") .OnClick(@<text> function() { $("#requests ul").empty(); } </text>) ) </div> <ul></ul> </div> </div> <script> function beforeSend(operation, ajaxSettings) { var data = ajaxSettings.data || {}, args = Object.keys(data).map(function (key) { return key + "=" + data[key]; }).join(" "); var logList = $("#requests ul"), time = DevExpress.localization.formatDate(new Date(), "HH:mm:ss"), newItem = $("<li>").text([time, ajaxSettings.method, ajaxSettings.url, args].join(" ")); logList.prepend(newItem); } </script>
using DevExtreme.NETCore.Demos.Models; using DevExtreme.NETCore.Demos.Models.DataGrid; using DevExtreme.NETCore.Demos.Models.SampleData; using Microsoft.AspNetCore.Mvc; using System.Linq; namespace DevExtreme.NETCore.Demos.Controllers { public class DataGridController : Controller { public ActionResult CRUDOperations() { return View(); } } }
using DevExtreme.AspNet.Data; using DevExtreme.AspNet.Mvc; using DevExtreme.NETCore.Demos.Models.Northwind; using Microsoft.AspNetCore.Http; using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Caching.Memory; using Newtonsoft.Json; using System.Linq; namespace DevExtreme.NETCore.Demos.Controllers.ApiControllers { [Route("api/[controller]/[action]")] public class DataGridWebApiController : Controller { InMemoryNorthwindContext _nwind; public DataGridWebApiController(NorthwindContext nwind, IHttpContextAccessor httpContextAccessor, IMemoryCache memoryCache) { _nwind = new InMemoryNorthwindContext(nwind, httpContextAccessor, memoryCache); } [HttpGet] public object Orders(DataSourceLoadOptions loadOptions) { return DataSourceLoader.Load(_nwind.Orders, loadOptions); } [HttpPost] public IActionResult InsertOrder(string values) { var newOrder = new Order(); JsonConvert.PopulateObject(values, newOrder); if(!TryValidateModel(newOrder)) return BadRequest(ModelState.GetFullErrorMessage()); _nwind.Orders.Add(newOrder); _nwind.SaveChanges(); return Ok(newOrder); } [HttpPut] public IActionResult UpdateOrder(int key, string values) { var order = _nwind.Orders.First(o => o.OrderID == key); JsonConvert.PopulateObject(values, order); if(!TryValidateModel(order)) return BadRequest(ModelState.GetFullErrorMessage()); _nwind.SaveChanges(); return Ok(order); } [HttpDelete] public void DeleteOrder(int key) { var order = _nwind.Orders.First(o => o.OrderID == key); _nwind.Orders.Remove(order); _nwind.SaveChanges(); } // additional actions [HttpGet] public object OrderDetails(int orderID, DataSourceLoadOptions loadOptions) { return DataSourceLoader.Load( from i in _nwind.Order_Details where i.OrderID == orderID select new { Product = i.Product.ProductName, Price = i.UnitPrice, Quantity = i.Quantity, Sum = i.UnitPrice * i.Quantity }, loadOptions ); } [HttpGet] public object ShippersLookup(DataSourceLoadOptions loadOptions) { var lookup = from i in _nwind.Shippers orderby i.CompanyName select new { Value = i.ShipperID, Text = i.CompanyName }; return DataSourceLoader.Load(lookup, loadOptions); } [HttpGet] public object CustomersLookup(DataSourceLoadOptions loadOptions) { var lookup = from i in _nwind.Customers let text = i.CompanyName + " (" + i.Country + ")" orderby i.CompanyName select new { Value = i.CustomerID, Text = text }; return DataSourceLoader.Load(lookup, loadOptions); } } }
using Microsoft.AspNetCore.Http; using Microsoft.EntityFrameworkCore; using Microsoft.Extensions.Caching.Memory; using System; using System.Collections.Generic; using System.Linq; namespace DevExtreme.NETCore.Demos.Models.Northwind { public class InMemoryNorthwindContext { NorthwindContext _nwind; IHttpContextAccessor _contextAccessor; IMemoryCache _memoryCache; public InMemoryNorthwindContext(NorthwindContext nwind, IHttpContextAccessor contextAccessor, IMemoryCache memoryCache) { _nwind = nwind; _memoryCache = memoryCache; _contextAccessor = contextAccessor; } public DbSet<Customer> Customers { get { return _nwind.Customers; } } public DbSet<Order_Detail> Order_Details { get { return _nwind.Order_Details; } } public ICollection<Order> Orders { get { var session = _contextAccessor.HttpContext.Session; var key = session.Id + "_Orders"; if(_memoryCache.Get(key) == null) { _memoryCache.Set<ICollection<Order>>(key, _nwind.Orders.ToList(), new MemoryCacheEntryOptions { SlidingExpiration = TimeSpan.FromMinutes(10) }); session.SetInt32("dirty", 1); } return _memoryCache.Get<ICollection<Order>>(key); } } public DbSet<Shipper> Shippers { get { return _nwind.Shippers; } } public void SaveChanges() { foreach(var order in Orders.Where(o => o.OrderID == 0)) { order.OrderID = Orders.Max(o => o.OrderID) + 1; } } } }
#grid { height: 440px; } .options { padding: 20px; margin-top: 20px; background-color: rgba(191, 191, 191, 0.15); } .caption { margin-bottom: 10px; font-weight: 500; font-size: 18px; } .option { margin-bottom: 10px; } .option > span { position: relative; top: 2px; margin-right: 10px; } .option > .dx-widget { display: inline-block; vertical-align: middle; } #requests .caption { float: left; padding-top: 7px; } #requests > div { padding-bottom: 5px; } #requests > div:after { content: ""; display: table; clear: both; } #requests #clear { float: right; } #requests ul { list-style: none; max-height: 100px; overflow: auto; margin: 0; } #requests ul li { padding: 7px 0; border-bottom: 1px solid #dddddd; } #requests ul li:last-child { border-bottom: none; }