53
ASP.NET Tips and Tricks
| Date post: | 24-May-2015 |
| Category: |
Education |
| Upload: | actacademy |
| View: | 1,262 times |
| Download: | 2 times |
ASP.NET Tips and Tricks
What we will cover Development Tips and Tricks Error Handling Tips and Tricks Production Tips and Tricks
Session Prerequisites
Level 300Level 300
ASP Basic knowledge of ASP.NET
Agenda
Development Tips and Tricks Error Handling Tips and Tricks Production Tips and Tricks
Development Tips And Tricks File upload ASP.NET provides built-in file upload support
No posting acceptor required No third party components required
Accessible through two APIs: Request.Files collection <input type=file> server control
HttpPostedFile Object: HttpPostedFile.InputStream HttpPostedFile.ContentType HttpPostedFile.FileName HttpPostedFile.SaveAs(fileLocation)
<html><script language="VB" runat=server> Sub Btn_Click(Sender as Object, E as EventArgs) UploadFile.PostedFile.SaveAs("c:\foo.txt") End Sub</script>
<body> <form enctype="multipart/form-data" runat=server> Select File To Upload: <input id="UploadFile" type=file runat=server> <asp:button OnClick="Btn_Click“ runat=server/> </form></body></html>
Development Tips And Tricks File upload example
Demonstration 1File Upload
File system is not the only option
Example: Storing within SQL Access uploaded file as byte array Store file within SQL as image (blob) Store ContentType and ContentLength also Provide “Edit Link” to display page Edit Link Page sets ContentType header and then
writes binary array back to client
Development Tips And Tricks Richer file upload
Demonstration 2File Upload With SQL
Rich server image generation Additionally supports resizing & cropping Overlays on top of existing images Read/Write Any Standard IO Stream
System.Drawing Dynamically generate GIFs/JPGs from .aspx Set ContentType appropriately Optionally output cache results
Development Tips And Tricks Image generation
Demonstration 3Image Generation
ASP.NET <asp:xml runat=server> Enables output of XML Enables optional XSL/T transform of XML
Binding options File system Database item
Built-in caching Ensure efficient re-use Improves performance
Development Tips And Tricks ASP.NET XML Server Control
<html> <body>
<asp:xml id="MyXml1" DocumentSource="SalesData.xml" TransformSource="SalesChart.xsl" runat=server />
</body></html>
Development Tips And Tricks <ASP:XML> file sample
Demonstration 4Static XML
<%@ Page ContentType="text/xml" %><%@ Import Namespace="System.Data" %><%@ Import Namespace="System.Data.SQLClient" %><%@ Import Namespace="System.Xml" %>
<script language="VB" runat=server> Sub Page_Load(Sender as Object, E as EventArgs) Dim conn as New SqlConnection(connectionString) Dim cmd as New SqlDataAdapter(“select * from products", conn)
Dim dataset As New DataSet() cmd.Fill (dataset, "dataset")
Dim XmlDoc as XmlDocument = New XmlDataDocument(dataset) MyXml1.Document = XmlDoc End Sub</script><asp:xml id="MyXml1" runat=server/>
Development Tips And Tricks <ASP:XML> data sample
Demonstration 5Dynamically Bind XML
Application specific settings Stored in web.config files Enables devs to avoid hard-coding them Administrators can later change them
Examples: Database Connection String MSMQ Queue Servers File Locations
Development Tips And Tricks App settings
1. Create “web.config” file in app vroot:
2. To return value:Configuration.AppSettings(“dsn”)
<configuration>
<appSettings>
<add key=“dsn”
value=“localhost;uid=sa;pwd=;Database=foo”/>
</appSettings>
</configuration>
Development Tips And Tricks App settings steps
Demonstration 6Application Settings
Session State no longer requires client cookie support for SessionID Can optionally track SessionID in URL
Requires no code changes to app All relative links continue to work
Development Tips And Tricks Cookieless sessions
1. Create “web.config” file in app vroot
2. Add following text:
<configuration>
<system.web>
<sessionState cookieless=“true”/>
</system.web>
</configuration>
Development Tips And Tricks Cookieless sessions steps
Eliminates browser flicker/scrolling on browser navigation Smooth client UI – but with server code Automatic down-level for non-IE browsers
No client code changes required <%@ Page SmartNavigation=“true” %> Alternatively set in web.config file
Development Tips And Tricks Smart navigation
Agenda
Development Tips and Tricks Error Handling Tips and Tricks Production Tips and Tricks
ASP.NET supports page and app tracing Easy way to include “debug” statements No more messy Response.Write() calls!
Great way to collect request details Server control tree Server variables, headers, cookies Form/Querystring parameters
Error Handling Tips And Tricks Page tracing
1. Add trace directive at top of page<%@ Page Trace=“True” %>
2. Add trace calls throughout pageTrace.Write(“Button Clicked”)
Trace.Warn(“Value: “ + value)
3. Access page from browser
Error Handling Tips And Tricks Page tracing steps
Demonstration 7Page Tracing
1. Create “web.config” file in app vroot:
2. Access tracing URL within app http://localhost/approot/Trace.axd
<configuration>
<system.web>
<trace enabled=“true” requestLimit=“10”/>
</system.web>
</configuration>
Error Handling Tips And Tricks Application tracing steps
Demonstration 8Application Tracing
.NET provides unified error architecture Runtime errors done using exceptions Full call stack information available w/ errors Can catch/handle/throw exceptions in
any .NET Language (including VB)
ASP.NET also provides declarative application custom error handling Enable programmatic logging of problems Automatically redirect users to error page
when unhandled exceptions occur
Error Handling Tips And Tricks Error handling
Global application event raised if unhandled exception occurs Provides access to current Request Provides access to Exception object Enables developer to log/track errors
Cool Tip: Use new EventLog class to write custom
events to log when errors occur Use new SmtpMail class to send email to
administrators
Error Handling Tips And Tricks Application_Error
Demonstration 9Writing to NT Event Log
<%@ Import Namespace=“System.Web.Mail" %><script language="VB" runat=server>
Sub Application_Error(sender as Object, e as EventArgs)
Dim MyMessage as New MailMessage
MyMessage.To = “[email protected]" MyMessage.From = "MyAppServer" MyMessage.Subject = "Unhandled Error!!!" MyMessage.BodyFormat = MailFormat.Html
MyMessage.Body = "<html><body><h1>" & Request.Path & _"</h1>" & Me.Error.ToString() & "</body></html>"
SmtpMail.Send(MyMessage)
End Sub</script>
Error Handling Tips And Tricks Sending SMTP mail
Enable easy way to “hide” errors from end-users visiting a site No ugly exception error messages Enables you to display a pretty “site under
repair” page of your design
Custom Errors configured within an application web.config configuration file Can be configured per status code number Can be configured to only display remotely
Error Handling Tips And Tricks Custom errors
1. Create “web.config” file in app vroot:<configuration>
<system.web>
<customErrors mode=“remoteonly”
defaultRedirect=“error.htm”>
<error statusCode=“404”
redirect=“adminmessage.htm”/>
<error statusCode=“403”
redirect=“noaccessallowed.htm”/>
</customErrors>
</system.web>
</configuration>
Error Handling Tips And Tricks Custom error page steps
Demonstration 10Custom Errors
Agenda
Development Tips and Tricks Error Handling Tips and Tricks Production Tips and Tricks
Per Application Performance Counters Enable easily monitoring of individual
ASP.NET applications
Custom Performance Counters APIs Now possible to publish unique application-
specific performance data Great for real-time application monitoring Example: total orders, orders/sec
Production Tips And Tricks Performance counters
Demonstration 11Performance Counters
ASP.NET runs code in an external worker process – aspnet_wp.exe Automatic Crash Recovery Automatic Memory Leak Recovery Automatic Deadlock Recovery
Can also proactively configure worker process to reset itself proactively Timer based Request based
Production Tips And Tricks Process model recovery
Session State can now be external from ASP.NET Worker Process ASPState Windows NT Service SQL Server™
Big reliability wins Session state survives crashes/restarts
Enables Web farm deployment Multiple FE machines point to a common
state store
Production Tips And Tricks Reliable session state
1. Start ASP State Service on a machine net start aspnet_state
2. Create “web.config” file in app vroot, and point it at state service machine:
<configuration>
<system.web>
<sessionState mode=“StateServer” stateConnectionString=“tcpip=server:port” />
</system.web>
</configuration>
Production Tips And Tricks External session state steps
Session Summary Very easy to implement Little or no coding required for most Enhances the reliability of your apps
For More Information… MSDN Web site at
msdn.microsoft.com ASP.NET Quickstart at
http://www.asp.net 900+ samples that can be run online
ASP.NET discussion lists
For good “best practice” reference applications, please visit IBuySpy http://www.IBuySpy.com
MSDN For Everyone
Enterprise ArchitectEnterprise Architect
Enterprise DeveloperEnterprise Developer
VB, C++, C#VB, C++, C#StandardStandard
ProfessionalProfessional
Visual Studio .NETVisual Studio .NET
UniversalUniversal
LibraryLibrary
Operating SystemsOperating Systems
MSDN SubscriptionsMSDN Subscriptions
ProfessionalProfessional
EnterpriseEnterprise NE
W
.NET Developer SIG’S (CT, MA and ME) msdn.microsoft.com/usergroups
4th Tuesday of each month (CT) CT http://www.ctmsdev.net.
2nd Wed of each month (MA and ME) ME http://www.mainebytes.com Feb 21 – ASP.NET Tips and Tricks MA http://www.idevtech.com
VB.NET 1st Thursday (MA) MA http://www.nevb.com
BACOM 2nd Monday (MA) MA http://www.bacom.com
Share Point Server (MA) 4th Tuesday MA http://www.starit.com/sughome First meeting Feb 4 – 7pm
.NET Developer SIG’S (NH, VT, RI) msdn.microsoft.com/usergroups
.NET user groups in NH http://www.nhdnug.com http://www.jjssystems.net
.NET user group in Burlington VT First meeting Feb 11 – 6PM – ASP.NET Tips and tricks
.Net user group for RI Details coming
Do you have a very large shop? See Russ ([email protected]) or Bill ([email protected])
about .NET Readiness offer.PARTNERS HEALTH CARE INC
RAYTHEON COMPANY
STAPLES
TEXTRON INC
THOMSON CORPORATION
TYCO INTERNATIONAL
UNITED HEALTHCARE CORP
UNITED TECHNOLOGIES CORPORATION
And more…
A B B ASEA BROWN BOVERI INC
AETNA
CIGNA
C V S
E M C CORPORATION
GETRONICS
GILLETTE COMPANY
INVENSYS PLC
NORTHEAST UTILITIES
.NET Blitz program For your development staff with a minimum size of 10 developers in
over 300 pre-approved companies.
One day onsite training – (seminar format) Needs analysis 90 day MSDN Universal for 5 developers Contact [email protected] to see if your company is on the list.
Live Webcast Events: http://www.microsoft.com/usa/webcasts/upcoming/
Architecting Web Services January 14, 2002 , 3pmMicrosoft Webcast Presents: XML Basics January 16, 2002, 3pm.NET Class Libraries From A to Z January 22, 2002, 2pm Understanding Visual Inheritance Jan 23, 2002 3pmAdvanced Web Services Using ASP .NETJanuary 29, 2002, 2PMWebservices 101January 30, 2002 3pmAdvanced XML/XSLFebruary 1, 2002 3:30pmHow To Build Mobile Solutions Using the Microsoft Mobile Internet Toolkit February 5, 2002 2pmCaching ASP.NET Application Settings February 6, 2002, 3pmBuilding a .NET Mobile Solution February 13, 2002 3pm
Live Webcast Events: http://www.microsoft.com/usa/webcasts/upcoming/
XML and Web Enabling Legacy Applications Using BizTalk Server 2000 February 19, 2002 2pm
Advanced Webpart Development February 20, 2002 3pmHow To Develop Asynchronous Applications with .NET Framework February 26, 2002 2pmIntroducing .NET Alerts February 27, 2002 3pm
Part 1: Architecting an Application using the .NET Framework March 5, 2002 2pm
Part 2: Building a .NET Application March 12, 2002 2pm
ASP .NET - Tips and Tricks March 19, 2002 2pm
Tool Shed Code and PowerPoint slides
PowerPoint slides: www.microsoft.com/usa/newengland/russtoolshed
Code: http://www.franklins.net/~russ
