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ObjectDataSource.ObjectCreating-Ereignis
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
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<%@ Import namespace="Samples.AspNet.CS" %> <%@ Page language="c#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> // Instead of creating and destroying the business object each time, the // business object is cached in the ASP.NET Cache. private void GetEmployeeLogic(object sender, ObjectDataSourceEventArgs e) { // First check to see if an instance of this object already exists in the Cache. EmployeeLogic cachedLogic; cachedLogic = Cache["ExpensiveEmployeeLogicObject"] as EmployeeLogic; if (null == cachedLogic) { cachedLogic = new EmployeeLogic(); } e.ObjectInstance = cachedLogic; } private void ReturnEmployeeLogic(object sender, ObjectDataSourceDisposingEventArgs e) { // Get the instance of the business object that the ObjectDataSource is working with. EmployeeLogic cachedLogic = e.ObjectInstance as EmployeeLogic; // Test to determine whether the object already exists in the cache. EmployeeLogic temp = Cache["ExpensiveEmployeeLogicObject"] as EmployeeLogic; if (null == temp) { // If it does not yet exist in the Cache, add it. Cache.Insert("ExpensiveEmployeeLogicObject", cachedLogic); } // Cancel the event, so that the object will // not be Disposed if it implements IDisposable. e.Cancel = true; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>ObjectDataSource - C# Example</title> </head> <body> <form id="Form1" method="post" runat="server"> <asp:gridview id="GridView1" runat="server" datasourceid="ObjectDataSource1"> </asp:gridview> <asp:objectdatasource id="ObjectDataSource1" runat="server" selectmethod="GetCreateTime" typename="Samples.AspNet.CS.EmployeeLogic" onobjectcreating="GetEmployeeLogic" onobjectdisposing="ReturnEmployeeLogic" > </asp:objectdatasource> </form> </body> </html>
namespace Samples.AspNet.CS { using System; using System.Collections; using System.Web.UI; using System.Web.UI.WebControls; // // EmployeeLogic is a stateless business object that encapsulates // the operations you can perform on a NorthwindEmployee object. // public class EmployeeLogic { public EmployeeLogic () : this(DateTime.Now) { } public EmployeeLogic (DateTime creationTime) { _creationTime = creationTime; } private DateTime _creationTime; // Returns a collection of NorthwindEmployee objects. public ICollection GetCreateTime () { ArrayList al = new ArrayList(); // Returns creation time for this example. al.Add("The business object that you are using was created at " + _creationTime); return al; } } }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core-Rolle wird nicht unterstützt), Windows Server 2008 R2 (Server Core-Rolle wird mit SP1 oder höher unterstützt; Itanium wird nicht unterstützt)
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen für .NET Framework.
