How Linq invokes data access Service
Editor to share with you how Linq calls data access services, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!
Linq invokes data access service
Linq calls the data access service to leave messages, reply, delete messages and so on. The code of the page is no longer posted, we modify the Default.cs as follows:
Public partial class _ Default: System.Web.UI.Pag {protected void Page_Load (object sender, EventArgs e) {if (! IsPostBack) {SetBind ();}} protected void btn_SendMessage_Click (object sender, EventArgs e) {TbGuestBook gb = new TbGuestBook (); gb.ID = Guid.NewGuid (); gb.IsReplied = false gb.PostTime = DateTime.Now; gb.UserName = tb_UserName.Text; gb.Message = tb_Message.Text; GetService.GetDataAccessService (). SendMessage (gb) SetBind ();} private void SetBind () {rpt_Message.DataSource = GetService.GetDataAccessService () .GetData (); rpt_Message.DataBind ();}}
The Admin.cs code is modified as follows:
Public partial class Admin: System.Web.UI.Page {protected void Page_Load (object sender, EventArgs e) {if (! IsPostBack) {SetBind ();}} private void SetBind () {rpt_Message.DataSource = GetService.GetDataAccessService (). GetData (); rpt_Message.DataBind ();} protected void rpt_Message_ItemCommand (object source, RepeaterCommandEventArgs e) {if (e.CommandName = = "DeleteMessage") {GetService.GetDataAccessService (). DeleteMessage (e.CommandArgument.ToString ()) SetBind ();} if (e.CommandName = = "SendReply") {TbGuestBook gb = new TbGuestBook (); gb.ID = new Guid (e.CommandArgument.ToString ()); gb.Reply = ((TextBox) e.Item.FindControl ("tb_Reply")). Text GetService.GetDataAccessService (). SendReply (gb); SetBind ();}
In this way, a message book program with multi-tier architecture is realized. Some of the contents of WCF will not be explained in this article. If you think this example is too simple, you can also download a more complex example of using Linq/WCF/MVC in conjunction with it. The purpose of this example is to demonstrate a framework with an incomplete implementation.
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