1 / 17

Understanding XML and Web.config Files

Learn about XML, its history, usage, and benefits, along with an introduction to web.config files for ASP.NET applications. Explore XML technologies and syntax examples.

veronica-norman
Télécharger la présentation

Understanding XML and Web.config Files

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction To XMLand using web.config file

  2. Topics • What is XML • History • Motivation • Where/Who uses XML • When to use/not use

  3. What Is XML • Data formatted in a way that is easy for humans and machines to read • eXtensible Markup Language • Text data, i.e. not binary • When stored in a file, one can view it with Notepad • Not a language • Fast becoming a universal data translation language

  4. Example <?xml version="1.0"?> <CustomerList> <customer id="1"> <fname> Jen </fname> <lname> Lo </lname> <title> CEO </title> <company> Blue Moon Enterprises </company> </customer> <customer id="2"> <fname> Austin </fname> <lname> Powers </lname> <title> Gold Member </title> <company> MiniEvil </company> </customer> </CustomerList>

  5. XML’s History • Specs published in Feb 1998 • Began to get popular in 2000 • Supported by most vendors and platforms • MS, IBM, Sun, Borland, … • I.E. >= 5.0 can display XML data

  6. Motivation • Businesses needed to communicate over the Internet. (B2B) • Send documents and complex data that have different formats • Word, PDF, Excel, Access, comma separated, … • E.g. think how many ways a person’s name can be formatted • Different Internet clients capabilities. • Desktops with different browsers • PDAs, Mobile phones, …

  7. Where/Who Uses XML • In databases to store or move data • In configuration files • In communication between systems • MS: .NET, IE, SQL Server, …

  8. To Use Or Not To Use • Use when you want to: • Communicate between different programs and systems • Store complex configuration data • Display output by different clients, e.g. desktops and PDAs. • Do not use when: • You need a relational database model, XML is less efficient than RDBs

  9. XML Technologies • The following slides will introduce some XML related terms and technologies • This a high level definition

  10. Tags And Elements Consider the following XML snippet: <customer id="2"> <fname> Austin </fname> <lname> Powers </lname> <title> Gold Member </title> <company> MiniEvil </company> </customer> • <fname> is a start tag • </fname> is an end tag • <fname>Austin</fname> is an element • id (in customer tag) is an attribute

  11. Well-Formed XML Document • Well-Formed document: • Follows XML syntax • Every start tag must have an end tag • If a document is not well-formed, then it is NOT an XML document

  12. Web.config file • Web.config is the main settings and configuration file for an ASP.NET web application. • The file is an XML document that defines configuration information regarding the web application. • The web.config file contains information that control module loading, security configuration, session state configuration, and application language and compilation settings. • Web.config files can also contain application specific items such as database connection strings.

  13. Web.config File <configuration> • <appSettings> • <add key="abc" value=“a certain value"/> • </appSettings> • <connectionStrings> • <add name="TestingConnectionString1" connectionString="Data Source=.;Initial Catalog=Testing;Integrated Security=True" providerName="System.Data.SqlClient"/> • </connectionStrings> • <system.web> • <compilation debug="true" strict="false" explicit="true"/> • <pages> • <namespaces> • <clear/> • <add namespace="System"/> • <add namespace="System.Collections"/> • <add namespace="System.Collections.Specialized"/> • <add namespace="System.Configuration"/> • <add namespace="System.Text"/> • <add namespace="System.Text.RegularExpressions"/> • <add namespace="System.Web"/> • <add namespace="System.Web.Caching"/> • <add namespace="System.Web.SessionState"/> • <add namespace="System.Web.Security"/> • <add namespace="System.Web.UI"/> • <add namespace="System.Web.UI.WebControls"/> • <add namespace="System.Web.UI.WebControls.WebParts"/> • <add namespace="System.Web.UI.HtmlControls"/> • </namespaces> • </pages> • <authentication mode="Windows"/> • </system.web> </configuration>

  14. Web.config File • At this point, we are interested in the web.config part that is highlighted in red in the previous example. • appSettings section • Contains custom application settings, such as file paths, XML Web service URLs.

  15. Web.config File • Ex) <appSettings> <add key=“imgsPath" value=“~/images/"/> </appSettings> • connectionStrings section: • Specifies a collection of database connection strings, as name/value pairs, for ASP.NET applications and features.

  16. Web.config File • Ex) <connectionStrings> <add name=“connStr“ connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=Testing;Integrated Security=True" providerName="System.Data.SqlClient"/> </connectionStrings>

  17. Web.config File • To retrieve a value from appSettings section and use it in ASP.NET code: ConfigurationManager.AppSettings(“app_name") • To retrieve a value from connectionString section and use it in ASP.NET code: ConfigurationManager.ConnectionStrings(“conStr").ConnectionString

More Related