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Cool Tips and Tricks with ASP.NET 2.0

Cool Tips and Tricks with ASP.NET 2.0. Stefan Schackow Program Manager ASP.NET Team Microsoft Corporation. Agenda. Cross Page Post-backs Validation Groups Wizard Control URL Rewriting/Mapping Compilation Build Providers and .WSDL Files “No-Compile” Pages

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Cool Tips and Tricks with ASP.NET 2.0

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  1. Cool Tips and Tricks with ASP.NET 2.0 Stefan Schackow Program Manager ASP.NET Team Microsoft Corporation

  2. Agenda • Cross Page Post-backs • Validation Groups • Wizard Control • URL Rewriting/Mapping • Compilation Build Providers and .WSDL Files • “No-Compile” Pages • Building CMS System w/ File System Provider • Securing non-ASP.NET web content with Forms Authentication • Client Script Goodies, Client Callbacks • XML Databinding

  3. Cross Page Posting • 2.0 Supports Cross Page Postbacks • Scenario: Search or lookup button at top of page • Postback target via “PostBackUrl” property • <asp:button PostBackUrl=“b.aspx” runat=“server”/> • Can be declaratively or programmatically set • Postback “target page” has full access to server controls for “originating page” • Access controls via “Page.PreviousPage” property • <%@ PreviousPage VirtualPath=“a.aspx” %>

  4. Cross-Page Postback Example: <!-- Page1.aspx --> <html> <body> <form runat=“server”> <asp:button text=“Same Page” OnClick=“Btn1_Click” runat=“server”/> <asp:calendar id=“MyCalendar” runat=“server”/> <asp:button text=“Page 2” PostBackUrl=“page2.aspx” runat=“server”/> </form> </body> </html> ‘ Page2.aspx Dim MyCalendar as Calendar = PreviousPage.FindControl(“MyCalendar”) Label1.Text = “You selected: “ & MyCalendar.SelectedDate <%@ PreviousPage VirtualPath=“page1.aspx” %> Label1.Text = “You selected: “ & PreviousPage.Exposed Property

  5. Cross Page Postback

  6. Validation Groups • Enable validation controls to only apply in response to a specific button/action • Today validation controls apply “all or nothing” • Indicated via “ValidationGroup” property • Supported by all Validation and Postback controls • Controls in ValidationGroup validate with postback • Programmatic Support for Validating Groups • If (Page.Validate(“group_name”)) Then • Page.IsValid evaluates ValidationGroup Postback

  7. ValidationGroup Example: <html> <body> <form runat=“server”> <asp:textbox id=“TextBox1” runat=“server”/> <asp:requiredfieldvalidator ValidationGroup=“Group1” ErrorText=“Need to Fill in Value!” ControlToValidate=“TextBox1” runat=“server”/> <asp:textbox id=“TextBox2” runat=“server”/> <asp:requiredfieldvalidator ValidationGroup=“Group2” ErrorText=“Need to Fill in Value!” ControlToValidate=“TextBox2” runat=“server”/> <asp:button text=“Group1” ValidationGroup=“Group1” runat=“server”/> <asp:button text=“Group2” ValidationGroup=“Group2” runat=“server”/> </form> </body> </html>

  8. Validation Groups

  9. <ASP:Wizard> Control • Enables linear and non-linear navigation • Developer defines templated “steps” within control • Control state maintained throughout wizard steps • Ideal for multi-step gathering workflow • Example Usage: Customer Registration • <asp:CreateUserWizard> built w/ Wizard • Flexible Wizard Control Navigation Model • MoveTo(wizardStep), ActiveStepIndex, etc • Events can fire both on individual steps and completion • Controls in wizard templates flattened to page • Enables direct control access w/o template fishing

  10. <ASP:Wizard> Example: <asp:Wizard id=“Wizard1” runat=“server” OnFinishButtonClick=“FinishBtn_Click”> <WizardSteps> <asp:WizardStep id=“WizardStep1” title=“Step 1”> Enter Name: <asp:textbox id=“Name” runat=“server”/> </asp:WizardStep> <asp:WizardStep id=“WizardStep1” title=“Step 2”> Enter State: <asp:textbox id=“State” runat=“server”/> </asp:WizardStep> <asp:WizardStep id=“Done” title=“Complete”> Congrats! The registration is complete! </asp:WizardStep> </WizardSteps> </asp:Wizard> Sub FinishBtn_Click(Sender as Object, E as WizardNavigationEventArgs) Label1.Text = “Hi “ & Name.Text & “ you are from: “ & State.Text End Sub

  11. Wizard Control

  12. URL Rewriting/Mapping • Built-in UrlMapping Module for rewriting paths • Enables “vanity” URLs instead of querystrings • Enables easy moving of pages without 404s • Useful Performance Tip: • Enables kernel level http caching on IIS6 for dynamic pages that would need querystrings <!-- Web.Config --> <urlMappings enabled=“true”> <add url=“~/Home.aspx” mappedUrl=“~/Default.aspx?tab=0” /> <add url=“~/Products/Books.aspx” mappedUrl=“~/Catalog.aspx?catid=1” /> </urlMappings>

  13. URL Rewriting

  14. Compilation Build Providers • 2.0 introduces concept of “Build Providers” that participate in compile process • Enable declarative file formats as code resources • Example Providers Built-in Whidbey: • .WSDL (web service proxies) • .XSD (data components) • .RESX (resource files) • Model of declarative files + partial types enables rich functionality w/ rich extensibility

  15. Compilation Build Providers • To build your own custom build provider: • Subclass System.Web.Compilation.BuildProvider • Register file extension in web/machine.config <compilation debug="false" explicit="true" defaultLanguage="vb"> <buildProviders> <add extension=".aspx" appliesTo="Web" type="System.Web.Compilation.PageBuildProvider" /> <add extension=".ascx" appliesTo="Web" type="System.Web.Compilation.UserControlBuildProvider" /> <add extension=".master" appliesTo="Web" type="System.Web.Compilation.MasterPageBuildProvider" /> <add extension=".asmx" appliesTo="Web" type="System.Web.Compilation.WebServiceBuildProvider" /> <add extension=".ashx" appliesTo="Web" type="System.Web.Compilation.WebHandlerBuildProvider" /> <add extension=".soap" appliesTo="Web" type="System.Web.Compilation.WebServiceBuildProvider" /> <add extension=".resx" appliesTo="Code,Resources" type="System.Web.Compilation.ResXBuildProvider" /> <add extension=".wsdl" appliesTo="Code" type="System.Web.Compilation.WsdlBuildProvider" /> <add extension=".xsd" appliesTo="Code" type="System.Web.Compilation.XsdBuildProvider" /> </buildProviders> </compilation>

  16. Compilation Build Providers

  17. “No-Compile” Pages • New feature in 2.0 to enable .ASPX pages to be executed without compilation • V1 .aspx pages always dynamically compiled • Two primary scenarios: • Enable site administrators to lockdown ability of content owners to write code on portions of site • Enable better scaling for sites with thousands of pages – don’t require separate type for each • Note: This is independent of the new pre-compilation tool – which compiles the pages prior to deployment

  18. “No-Compile” Config <system.web> <pages compilationMode=“[mode]”/> </system.web> [mode] = “Always”, “Never”, “Auto” // Default: Always

  19. No-Compile Pages

  20. File System Provider • 2.0 enables web content to be served from non-file system locations • Example: Database or CMS system • Developers sub-class “VirtualPathProvider”: • GetCacheDependency() • GetFileHash() • GetFile() • GetDirectory() • Tip: Can leverage new SqlCacheDependency object to enable SQL Cache Invalidation

  21. Simple CMS DB-Driven File Provider

  22. Securing Non-ASP.NET Content • 2.0 enables devs to use ASP.NET forms authentication for non-ASP.NET files • Static Files: .html, .jgp, .gif, .xml, etc • Dynamic Files: .ASP, .PHP, .JSP • Requires IIS 6.0 (new ExecuteUrl feature) • ASP.NET executes resource first, then passes execution flow to originating ISAPI

  23. Web.Config Security Permissions <authentication mode=“Forms” loginUrl=“login.aspx”/> <location path=“MyClassicASP.asp”> <system.web> <authorization> <allow roles=“PremiumUsers”/> <allow roles=“Admin”/> <deny users=“*”/> </authorization> </system.web> </location>

  24. IIS 6.0 MMC Configuration

  25. Securing ASP Pages with ASP.NET

  26. Client Script Goodies <asp:button Text=“Push Me!” OnClick=“Button1_Click” OnClientClick=“ClientButton1_Click” runat=“server” /> • Client-side click event handlers on controls: • Focus mechanisms: • Page.SetFocus(control) • TextBox.Focus() • Default button and focus • <form DefaultFocus=“control1” runat=“server”> • <form DefaultButton=“button1” runat=“server”>

  27. Client Script Goodies • Validation Error Focus • “SetFocusOnError” property • Auto-scroll maintenance on postback • Ideal for large pages – no code required • Simplified Client Script Registration • Page.ClientScript helper methods • Client-side Event Callbacks • ICallBackEventHandler interface • Used by TreeView, GridView controls

  28. Client Script Goodies

  29. XML Databinding • <asp:XmlDataSource> control enables data source binding against XML files • Optional XPath expression to scope results • <asp:DataList> supports binding against <asp:XMLDataSource> • Use “XPath(expression)” statement in templates • “XPathSelect(expression)” selects a node list • Combine two to build simple RSS Reader

  30. RSS Reader Using XML Databinding

  31. Summary • Enormous number of new features in ASP.NET 2.0 • Tons of additional cool features out there… • Visit http://www.asp.net/whidbey to download slides and samples • Start exploring ASP.NET 2.0 today!

  32. ASP.NET Community • http://www.asp.net/whidbey has whitepapers, samples, slides and forums dedicated to ASP.NET 2.0 • http://beta.asp.net/quickstart has tons of samples and source code • Email: • bradmi@microsoft.com

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