ASP.Net/Data Binding/Bind a Property
Bind a property Demo (VB.net)
<source lang="csharp">
<%@ Page Language="VB" %> <html> <head>
<title>Simple DataBinding Example</title> <script runat="server"> Dim FontColor As String Sub Page_Load() FontColor = "Red" DataBind() End Sub </script>
</head> <body>
Simple DataBinding Example
The value for FontColor is <font color="<%# FontColor %>"><%# FontColor %></font>.
</body> </html>
</source>
Bind DataList to Class Property (C#)
<source lang="csharp">
<%@ Page language="c#" src="GuestBook.aspx.cs" AutoEventWireup="false" Inherits="GuestBook.GuestBook" %> <HTML>
<body> <form id="Form1" method="post" runat="server">
<asp:DataList id="GuestBookList" runat="server">
<SelectedItemStyle></SelectedItemStyle>
<ItemStyle></ItemStyle>
<FooterStyle></FooterStyle>
<ItemTemplate>
Left By:
<%# DataBinder.Eval(Container.DataItem, "Author") %>
<%# DataBinder.Eval(Container.DataItem, "Message") %>
Left On:
<%# DataBinder.Eval(Container.DataItem, "Submitted") %>
</ItemTemplate>
<HeaderStyle></HeaderStyle>
</asp:DataList>
<asp:Label id="Label1" runat="server" Width="104px" Height="24px">Your Name:</asp:Label> <asp:Label id="Label2" runat="server" Width="104px" Height="24px">Your Message:</asp:Label> <asp:TextBox id="txtName" runat="server" Width="392px"></asp:TextBox> <asp:TextBox id="txtMessage" runat="server" Width="392px" Height="154px" TextMode="MultiLine"></asp:TextBox><asp:Button id="cmdSubmit" runat="server" Width="104px" Text="Submit"></asp:Button>
</form> </body>
</HTML>
<%-- using System; using System.Collections; using System.ruponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; using System.IO; namespace GuestBook {
/// <summary> /// Summary description for GuestBook. /// </summary> public class GuestBook : System.Web.UI.Page { protected System.Web.UI.WebControls.DataList GuestBookList; protected System.Web.UI.WebControls.Label Label1; protected System.Web.UI.WebControls.Label Label2; protected System.Web.UI.WebControls.TextBox txtName; protected System.Web.UI.WebControls.TextBox txtMessage; protected System.Web.UI.WebControls.Button cmdSubmit; private string guestBookName; private void Page_Load(object sender, System.EventArgs e) { guestBookName = Server.MapPath("GuestBook"); if (!this.IsPostBack) { GuestBookList.DataSource = GetAllEntries(); GuestBookList.DataBind(); } } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.cmdSubmit.Click += new System.EventHandler(this.cmdSubmit_Click); this.Load += new System.EventHandler(this.Page_Load); } #endregion private void cmdSubmit_Click(object sender, System.EventArgs e) { BookEntry newEntry = new BookEntry(); newEntry.Author = txtName.Text; newEntry.Submitted = DateTime.Now; newEntry.Message = txtMessage.Text; SaveEntry(newEntry); GuestBookList.DataSource = GetAllEntries(); GuestBookList.DataBind(); txtName.Text = ""; txtMessage.Text = ""; } private ArrayList GetAllEntries() { ArrayList entries = new ArrayList(); DirectoryInfo guestBookDir = new DirectoryInfo(guestBookName); foreach (FileInfo fileItem in guestBookDir.GetFiles()){ entries.Add(GetEntryFromFile(fileItem)); } return entries; } private BookEntry GetEntryFromFile(FileInfo entryFile) { BookEntry newEntry = new BookEntry(); StreamReader r = entryFile.OpenText(); newEntry.Author = r.ReadLine(); newEntry.Submitted = DateTime.Parse(r.ReadLine()); newEntry.Message = r.ReadLine(); r.Close(); return newEntry; } private void SaveEntry(BookEntry entry) { string fileName = guestBookName + @"\"; fileName += DateTime.Now.Ticks.ToString(); FileInfo newFile = new FileInfo(fileName); StreamWriter w = newFile.CreateText(); w.WriteLine(entry.Author); w.WriteLine(entry.Submitted.ToString()); w.WriteLine(entry.Message); w.Flush(); w.Close(); } }
public class BookEntry { private string author; private DateTime submitted; private string message; public string Author { get { return author; } set { author = value; } } public DateTime Submitted { get { return submitted; } set { submitted = value; } } public string Message { get { return message; } set { message = value; } } }
}
--%>
</source>