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Client-Side CRUD with AJAX-enabled WCF

Description

RadGrid with Client-Side CRUD (Create, Read, Update, Delete) operations using RadClientDataSource that is connected to an Ajax-Enabled WCF Service.

Solution

Default.aspx

<script type="text/javascript">
    function ParameterMap(sender, args) {
        if (args.get_type() != "read" && args.get_data()) {
            args.set_parameterFormat({ customersJSON: kendo.stringify(args.get_data().models) });
        }
    }

    function Parse(sender, args) {
        var response = args.get_response().d;

        if (response) {
            args.set_parsedData(response.Data);
        }
    }
</script>

<telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" ClientDataSourceID="RadClientDataSource1" AllowPaging="true">
    <MasterTableView ClientDataKeyNames="CustomerID" EditMode="Batch" CommandItemDisplay="Top" BatchEditingSettings-HighlightDeletedRows="true">
        <Columns>
            <telerik:GridBoundColumn DataField="CustomerID" HeaderText="Customer ID" ReadOnly="true">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn DataField="CompanyName" HeaderText="Company Name" ColumnEditorID="GridTextBoxEditor">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn DataField="ContactName" HeaderText="Contact Name" ColumnEditorID="GridTextBoxEditor">
            </telerik:GridBoundColumn>
            <telerik:GridClientDeleteColumn HeaderText="Delete">
                <HeaderStyle Width="70px" />
            </telerik:GridClientDeleteColumn>
        </Columns>
    </MasterTableView>
</telerik:RadGrid>


<telerik:RadClientDataSource ID="RadClientDataSource1" runat="server" AllowBatchOperations="true">
    <ClientEvents OnCustomParameter="ParameterMap" OnDataParse="Parse" />
    <DataSource>
            <WebServiceDataSourceSettings BaseUrl="GridCrud.svc/">
            <Select Url="GetCustomers" DataType="JSON" />
            <Update Url="UpdateCustomers" DataType="JSON" />
            <Insert Url="InsertCustomers" DataType="JSON" />
            <Delete Url="DeleteCustomers" DataType="JSON" />
        </WebServiceDataSourceSettings>
    </DataSource>
    <Schema>
        <Model ID="CustomerID">
            <telerik:ClientDataSourceModelField FieldName="CustomerID" DataType="Number" />
            <telerik:ClientDataSourceModelField FieldName="CompanyName" DataType="String" />
            <telerik:ClientDataSourceModelField FieldName="ContactName" DataType="String" />
            <telerik:ClientDataSourceModelField FieldName="ContactTitle" DataType="String" />
        </Model>
    </Schema>
</telerik:RadClientDataSource>

Default.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
        Session["MySessionKey"] = null;
}

GridCrud.svc

<%@ ServiceHost Language="C#" Debug="true" Service="GridCrud" CodeBehind="~/App_Code/GridCrud.cs" %>

~/App_Code/GridCrud.cs

using System.Collections.Generic;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.ServiceModel.Web;
using System.Web;
using System.Web.Script.Serialization;

[ServiceContract(Namespace = "")]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class GridCrud
{
    #region RadGrid Client-Side CRUD
    #region DataSource
    private string _sessionKey = "MySessionKey";
    public List<Customer> SessionDataSource
    {
        get
        {
            if (HttpContext.Current.Session[_sessionKey] == null)
            {
                HttpContext.Current.Session[_sessionKey] = Enumerable.Range(1, 100).Select(
                cu => new Customer
                {
                    CustomerID = cu,
                    Address = "Address " + cu,
                    CompanyName = "CompanyName " + cu,
                    ContactName = "ContactName " + cu,
                    ContactTitle = "ContactTitle " + cu
                }
                ).ToList();
            }
            return (List<Customer>)HttpContext.Current.Session[_sessionKey];
        }
    }
    #endregion

    #region CRUD methods
    [WebGet]
    public CustomersResult GetCustomers()
    {
        System.Threading.Thread.Sleep(3000);
        return new CustomersResult
        {
            Data = SessionDataSource,
            Count = SessionDataSource.Count(),
            Action = "Read"
        };
    }

    [WebGet]
    public CustomersResult UpdateCustomers(string customersJSON)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        List<Customer> updatedCustomers = (List<Customer>)serializer.Deserialize(customersJSON, typeof(List<Customer>));

        foreach (Customer updatedCustomer in updatedCustomers)
        {
            Customer dbCustomer = SessionDataSource.FirstOrDefault(c => c.CustomerID == updatedCustomer.CustomerID);
            dbCustomer.CompanyName = updatedCustomer.CompanyName;
            dbCustomer.ContactName = updatedCustomer.ContactName;
            dbCustomer.ContactTitle = updatedCustomer.ContactTitle;
            dbCustomer.Address = updatedCustomer.Address;
        }

        return new CustomersResult()
        {
            Data = updatedCustomers,
            Count = updatedCustomers.Count,
            Action = "Update"
        };
    }

    [WebGet]
    public CustomersResult InsertCustomers(string customersJSON)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        List<Customer> insertedCustomers = (List<Customer>)serializer.Deserialize(customersJSON, typeof(List<Customer>));

        var lastId = SessionDataSource.Count > 0 ? SessionDataSource.Max(cu => cu.CustomerID) : 0;

        foreach (Customer insertedCustomer in insertedCustomers)
        {
            Customer newCustomer = new Customer()
            {
                CustomerID = lastId + 1,
                CompanyName = insertedCustomer.CompanyName,
                ContactName = insertedCustomer.ContactName,
                ContactTitle = insertedCustomer.ContactTitle,
                Address = insertedCustomer.Address
            };
            insertedCustomer.CustomerID = newCustomer.CustomerID;

            SessionDataSource.Add(newCustomer);
        }

        return new CustomersResult
        {
            Data = insertedCustomers,
            Count = insertedCustomers.Count,
            Action = "Create"
        };
    }

    [WebGet]
    public CustomersResult DeleteCustomers(string customersJSON)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        List<Customer> customers = (List<Customer>)serializer.Deserialize(customersJSON, typeof(List<Customer>));

        foreach (Customer removedCustomer in customers)
        {
            Customer customer = SessionDataSource.Find(c => c.CustomerID == removedCustomer.CustomerID);
            SessionDataSource.Remove(customer);
        }

        return new CustomersResult()
        {
            Data = customers,
            Count = customers.Count,
            Action = "Delete"
        };
    }
    #endregion
    #endregion
}

~/App_Code/Customer.cs

using System.Collections.Generic;
using System.Runtime.Serialization;

#region Customer Model
[DataContract]
public class Customer
{
    [DataMember]
    public int CustomerID { get; set; }
    [DataMember]
    public string CompanyName { get; set; }
    [DataMember]
    public string ContactName { get; set; }
    [DataMember]
    public string ContactTitle { get; set; }
    [DataMember]
    public string Address { get; set; }
    [DataMember]
    public string __type { get; set; }
}
[DataContract]
public class CustomersResult
{
    [DataMember]
    public List<Customer> Data { get; set; }
    [DataMember]
    public int Count { get; set; }
    [DataMember]
    public string Action { get; set; }
    [DataMember]
    public string __type { get; set; }
}
#endregion

web.config

<configuration>
    <!--Other Settings here-->

    <!--WebService related Settings-->
    <system.serviceModel>
        <behaviors>
            <serviceBehaviors>
                <behavior name="debug">
                    <serviceDebug includeExceptionDetailInFaults="true" />
                </behavior>
            </serviceBehaviors>

            <endpointBehaviors>
                <behavior name="GridCrudAspNetAjaxBehavior">
                    <enableWebScript />
                </behavior>
            </endpointBehaviors>
        </behaviors>
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true"
            multipleSiteBindingsEnabled="true" />
        <services>
            <service name="GridCrud" behaviorConfiguration="debug">
                <endpoint address="" behaviorConfiguration="GridCrudAspNetAjaxBehavior" binding="webHttpBinding"  contract="GridCrud" />
            </service>
        </services>
    </system.serviceModel>
</configuration>
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