ASP.NET Tutorial/Data Binding/Parameters — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Версия 15:30, 26 мая 2010
Collection with ObjectDataSource
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ObjectDataSource" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ObjectDataSource</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ObjectDataSource ID="ObjectDataSource1"
runat="server"
DataObjectTypeName="Customer"
DeleteMethod="Delete"
InsertMethod="Add"
SelectMethod="GetCustomers"
TypeName="CustomerData"
UpdateMethod="Update"
SelectCountMethod="Count">
<UpdateParameters>
<asp:Parameter Name="customerID" Type="Int32" />
<asp:Parameter Name="firstName" Type="String" />
<asp:Parameter Name="lastName" Type="String" />
<asp:Parameter Name="address" Type="String" />
<asp:Parameter Name="city" Type="String" />
<asp:Parameter Name="state" Type="String" />
</UpdateParameters>
</asp:ObjectDataSource>
<asp:GridView ID="GridView1"
runat="server"
AutoGenerateColumns="False"
DataSourceID="ObjectDataSource1"
CellPadding="4"
ForeColor="#333333"
GridLines="None">
<Columns>
<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
<asp:BoundField DataField="CustomerID" HeaderText="CustomerID" SortExpression="CustomerID" />
<asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
<asp:BoundField DataField="State" HeaderText="State" SortExpression="State" />
</Columns>
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<EditRowStyle BackColor="#999999" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
</asp:GridView>
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
[Serializable]
public class Customer
{
private int customerID;
public int CustomerID
{
get { return customerID; }
set { customerID = value; }
}
private string firstName;
public string FirstName
{
get { return firstName; }
set { firstName = value; }
}
private string lastName;
public string LastName
{
get { return lastName; }
set { lastName = value; }
}
private string address;
public string Address
{
get { return address; }
set { address = value; }
}
private string city;
public string City
{
get { return city; }
set { city = value; }
}
private string state;
public string State
{
get { return state; }
set { state = value; }
}
public Customer()
{
}
public Customer(int customerID,
string firstName,
string lastName,
string address,
string city,
string state)
{
this.CustomerID = customerID;
this.FirstName = firstName;
this.LastName = lastName;
this.Address = address;
this.City = city;
this.State = state;
}
}
public class CustomerData
{
public CustomerData()
{
if (Customers.Rows.Count == 0)
{
FetchCustomers();
}
}
public void Update(int customerID,
string firstName,
string lastName,
string address,
string city,
string state)
{
Customer c = Get(customerID);
c.CustomerID = customerID;
c.FirstName = firstName;
c.LastName = lastName;
c.Address = address;
c.City = city;
c.State = state;
}
public IEnumerable<Customer> GetCustomers()
{
foreach (DataRow row in Customers.Rows)
yield return CustomerFromRow(row);
}
public List<Customer> GetCustomers(int rows, int startIndex)
{
if (rows == 0) rows = Customers.Rows.Count;
List<Customer> pageCustomers = new List<Customer>();
for (int i = startIndex; i <= rows && i <= Customers.Rows.Count - 1; i++)
pageCustomers.Add(CustomerFromRow(Customers.Rows[i]));
return pageCustomers;
}
public Customer Get(int id)
{
return FetchCustomerById(id);
}
public void Add(Customer c)
{
Customers.Rows.Add(
c.CustomerID,
c.FirstName,
c.LastName,
c.Address,
c.City,
c.State
);
}
public void Delete(int id)
{
DataRow[] rows = Customers.Select("CustomerID = " + id);
if (rows.Length == 1)
Customers.Rows.Remove(rows[0]);
}
public void Delete(Customer c)
{
Delete(c.CustomerID);
}
public int Count()
{
return Customers.Rows.Count;
}
private void FetchCustomers()
{
string[] First = new string[] {"A", "B", "C", "D", "E" };
string[] Last = new string[] { "F", "G", "H", "I", "J" };
Random rng = new Random(Guid.NewGuid().GetHashCode());
for (int i = 1; i < 50; i++)
this.Add(
new Customer(
i, First[rng.Next(5)],
Last[rng.Next(5)],
rng.Next(1000) + " St.",
"Dallas",
"TX"));
}
private Customer FetchCustomerById(int id)
{
DataRow[] rows = Customers.Select("CustomerID = " + id);
if (rows.Length == 1)
{
return CustomerFromRow(rows[0]);
}
return null;
}
private Customer CustomerFromRow(DataRow row)
{
Customer c = new Customer(
int.Parse(row["CustomerID"].ToString()),
row["FirstName"].ToString(),
row["LastName"].ToString(),
row["Address"].ToString(),
row["City"].ToString(),
row["State"].ToString()
);
return c;
}
private DataTable Customers
{
get
{
System.Web.HttpContext context = System.Web.HttpContext.Current;
DataTable dt = context.Session["CustomerData"] as DataTable;
if (context.Session["CustomerData"] as DataTable == null)
{
context.Session["CustomerData"] = CreateCustomerTable();
}
return context.Session["CustomerData"] as DataTable;
}
set
{
System.Web.HttpContext.
Current.Session["CustomerData"] = value;
}
}
private DataTable CreateCustomerTable()
{
DataTable dt = new DataTable("Customers");
dt.Columns.Add("CustomerID", typeof(Int32));
dt.Columns.Add("FirstName", typeof(string));
dt.Columns.Add("LastName", typeof(string));
dt.Columns.Add("Address", typeof(string));
dt.Columns.Add("City", typeof(string));
dt.Columns.Add("State", typeof(string));
return dt;
}
}
public partial class ObjectDataSource : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
}
Using ASP.NET Parameters with DataSource Controls
The SqlDataSource, AccessDataSource, LinqDataSource, and ObjectDataSource controls all support the following types of Parameter objects:
Parameter: Represents an arbitrary static value.
ControlParameter: Represents the value of a control or page property.
CookieParameter: Represents the value of a browser cookie.
FormParameter: Represents the value of an HTML form field.
ProfileParameter: Represents the value of a Profile property.
QueryStringParameter: Represents the value of a query string field.
SessionParameter: Represents the value of an item stored in Session state.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Control Parameter</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList
id="ddlProductCategory"
DataSourceID="srcProductCategories"
DataTextField="Name"
DataValueField="Id"
Runat="server" />
<asp:Button
id="btnSelect"
Text="Select"
ToolTip="Select Product"
Runat="server" />
<hr />
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
Runat="server" />
<asp:SqlDataSource
id="srcProductCategories"
ConnectionString="Server=.\SQLExpress;
Trusted_Connection=True;AttachDbFileName=|DataDirectory|MyDatabase.mdf;
User Instance=True"
SelectCommand="SELECT Id,Name FROM ProductCategories"
Runat="server" />
<asp:SqlDataSource
id="srcProducts"
ConnectionString="Data Source=.\SQLExpress;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;
Integrated Security=True;User Instance=True"
SelectCommand="SELECT Title,Director FROM Products
WHERE CategoryId=@Id"
Runat="server">
<SelectParameters>
<asp:ControlParameter
Name="Id"
Type="int32"
ControlID="ddlProductCategory" />
</SelectParameters>
</asp:SqlDataSource>
</div>
</form>
</body>
</html>