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ASP.NET Tutorial/Data Binding/Expressions - История изменений
2026-04-29T16:10:21Z
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в 15:30, 26 мая 2010
2010-05-26T15:30:57Z
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Admin: 1 версия
2010-05-26T11:58:08Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Binding Expression==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@Page debug="true"%><br />
<script language="C#" runat="server" ><br />
DateTime theTime;<br />
protected void Page_Load(object o, EventArgs e) {<br />
theTime = DateTime.Now;<br />
Page.DataBind();<br />
}<br />
</script><br />
The time is: <%# theTime %><br/></source><br />
<br />
<br />
<br />
== Databind the result of a method call==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<script runat="server" language="C#"><br />
protected void Page_Load(object o, EventArgs e) {<br />
if(IsPostBack) {<br />
Page.DataBind();<br />
}<br />
}<br />
protected double CalculateFactorial(int input) {<br />
double result = 1;<br />
for(;input > 0; input--) {<br />
result *= input;<br />
}<br />
return result;<br />
}<br />
</script><br />
<form runat="server"><br />
Databind the result of a method call.<br />
<asp:Textbox runat="server" id="theInput" /><br/><br />
<asp:RequiredFieldValidator <br />
runat="server"<br />
ControlToValidate="theInput"<br />
ErrorMessage="input is required" /><br />
<asp:RangeValidator<br />
runat="server"<br />
ControlToValidate="theInput"<br />
ErrorMessage="input must be >= 0 and < 20"<br />
Type="integer"<br />
MinimumValue="0"<br />
MaximumValue="20" /><br/><br />
<asp:Button <br />
runat="server" <br />
type="submit" <br />
Text="Calculate Factorial" /><br/><br />
The result is: <b><%# CalculateFactorial(Int32.Parse(theInput.Text)).ToString() %></b><br />
</form></source><br />
<br />
<br />
<br />
== DataList with data binding expression==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Extracting Rows From Templates</title><br />
</head><br />
<body><br />
<form id="form1" runat="server"><br />
<div><br />
<asp:SqlDataSource ID="SqlDataSource1" runat="server"<br />
ConnectionString="<%$ ConnectionStrings:NorthWind %>"<br />
SelectCommand="SELECT TOP 10 * FROM customers"><br />
</asp:SqlDataSource><br />
<br />
<asp:DataList ID="list" runat="server" DataSourceID="SqlDataSource1" <br />
ExtractTemplateRows="true" RepeatColumns="3" BorderStyle="Solid" BorderWidth="1px"><br />
<alternatingitemstyle backcolor="PaleGoldenrod" /><br />
<headerstyle backcolor="Brown" forecolor="White" font-size="Larger" <br />
font-bold="True" horizontalalign="Center" /><br />
<HeaderTemplate><br />
<asp:table ID="Table1" runat="server"><br />
<asp:tablerow ID="Tablerow1" runat="server"><br />
<asp:tablecell ID="Tablecell1" runat="server">Customer</asp:TableCell><br />
<asp:tablecell ID="Tablecell2" runat="server">Contact</asp:TableCell><br />
</asp:tablerow><br />
</asp:table><br />
</HeaderTemplate><br />
<br />
<ItemTemplate><br />
<asp:table ID="Table2" runat="server"><br />
<asp:tablerow ID="Tablerow2" runat="server" font-bold="true"><br />
<asp:tablecell ID="Tablecell3" runat="server"><br />
<%# Eval("CustomerID") %><br />
</asp:tablecell><br />
<asp:tablecell ID="Tablecell4" runat="server"><br />
<%# Eval("ContactName") %><br />
</asp:tablecell><br />
</asp:tablerow><br />
<asp:tablerow ID="Tablerow3" runat="server"><br />
<asp:tablecell ID="Tablecell5" runat="server" columnspan="2"><br />
<%# Eval("Address") + " - " + <br />
Eval("City") %><br />
</asp:tablecell><br />
</asp:tablerow><br />
</asp:table><br />
</ItemTemplate><br />
</asp:datalist> <br />
</div><br />
</form><br />
</body><br />
</html></source><br />
<br />
<br />
<br />
== Put simple data binding expressions==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="csharp"><br />
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" <br />
Inherits="Default"%><br />
<%@ Import Namespace="System.Drawing" %><br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml" ><br />
<head runat="server"><br />
<title>Simple Data Binding</title><br />
</head><br />
<body><br />
<div id="pageContent"><br />
<form id="form1" runat="server"><br />
<asp:DropDownList ID="SelColors" runat="server" AutoPostBack="True"><br />
<asp:ListItem>Orange</asp:ListItem><br />
<asp:ListItem>Green</asp:ListItem><br />
<asp:ListItem>Cyan</asp:ListItem><br />
<asp:ListItem>Red</asp:ListItem><br />
<asp:ListItem>Blue</asp:ListItem><br />
</asp:DropDownList><br />
<asp:Label runat="server" ID="lblColor" EnableTheming="false"<br />
ForeColor="<%# Color.FromName(SelColors.SelectedValue) %>"<br />
Text="<%# "<b>You selected: </b>" + SelColors.SelectedValue %>" /> <br />
<asp:Label runat="server" ID="Label4" Text="<%# "on " + DateTime.Now %>" /> <br />
<hr /><br />
</form><br />
</div><br />
</body><br />
</html><br />
File: Default.aspx.cs<br />
using System;<br />
using System.Data;<br />
using System.Configuration;<br />
using System.Data.SqlClient;<br />
using System.Collections;<br />
using System.Web;<br />
using System.Web.Security;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
using System.Drawing;<br />
<br />
public partial class Default : System.Web.UI.Page<br />
{<br />
void Page_Load(object sender, EventArgs e)<br />
{<br />
DataBind();<br />
}<br />
}</source></div>
Admin