Browser Detection using ASP.NET
ASP.NET solves this problem by introducing a more powerful regular expression-based method of determining the browser. Instead of relying on simple wildcard searches, the ASP.NET browser detection uses regular expressions to allow more complex testing and data extraction. An example of the format of the browser-sniffing expressions is given below
browser=Opera version=${version} majorversion=${major} minorversion=${minor} frames=true tables=true cookies=true javascript=true ecmascriptversion=1.1 isMobileDevice="true" ecmascriptversion=1.3 css1=true css2=true xml=true w3cdomversion=1.0 beta=true
This branch specifies that the HTTP_USER_AGENT
header sent from the browser should be matched against the
expressions that follow. You will notice the expression differs from the traditional ASP method in that it's possible to extract information from the match and assign the extracted values to browser properties. For example, when the user agent string
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2) Opera 7.23 [en]
is matched against the expression
Opera[ /](?'version'(?'major'\d+)(?'minor'\.\d+)(?'letters'\w*))
the values 'version', 'major' and 'minor' will be set as '7.23', '7' and '.23' respectively.
To access this information you would do something like the following:
Finding Brouser, ASP.NET<% response.write(request.browser.browser.tostring()); response.write(request.browser.version.tostring());%>
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