ImageResizer.Plugins.Basic.IEPngFix Class Reference

Causes IE6 and earlier to use GIF versions of PNG files. By default, only fixes requests with ?iefix=true in the querystring. When catchall is enabled, it will filter all png images, unless iefix=false on those requests. Not compatible with CDNs or proxy servers, as they do not allow varying by user agent reliably. More...

Inheritance diagram for ImageResizer.Plugins.Basic.IEPngFix:

Collaboration diagram for ImageResizer.Plugins.Basic.IEPngFix:

Public Member Functions
	IEPngFix (NameValueCollection settings)
IPlugin	Install (Configuration.Config c)
bool	Uninstall (Configuration.Config c)
IEnumerable< string >	GetSupportedQuerystringKeys ()
	If the plugin reads any values from the querystring, the names of the keys should be specified here. This information is required so that the HttpModule knows when to handle an image request. More...
Public Member Functions inherited from ImageResizer.Plugins.IPlugin
IPlugin	Install (Config c)
	Installs the plugin in the specified Config instance. The plugin must handle all the work of loading settings, registering the plugin etc. More...
bool	Uninstall (Config c)
	Uninstalls the plugin. Should reverse all changes made during Install More...

Static Public Member Functions
static bool	NeedsPngFix (HttpContext context)
	Returns true if the user agent string specifies MSIE versions 1 through 6 for Windows. Cached in context.Items after first call. More...

Properties
bool	CatchAll [get, set]
	If true, 'iefix=true' will be the default for all PNG images, instead of 'iefix=false'. More...
bool	Redirect [get, set]
	If true, the requests from IE will be HTTP redirected to new URLs. If false, the GIF will be silently served instead of the PNG, without any redirection. A CDN or caching proxy will mess things up regardless, but using redirection ensures that the CDN/proxy never caches the GIF version instead of the PNG. More...

Detailed Description

Causes IE6 and earlier to use GIF versions of PNG files. By default, only fixes requests with ?iefix=true in the querystring. When catchall is enabled, it will filter all png images, unless iefix=false on those requests. Not compatible with CDNs or proxy servers, as they do not allow varying by user agent reliably.

Definition at line 19 of file IEPngFix.cs.

Member Function Documentation

IEnumerable<string> ImageResizer.Plugins.Basic.IEPngFix.GetSupportedQuerystringKeys ( )

inline

If the plugin reads any values from the querystring, the names of the keys should be specified here. This information is required so that the HttpModule knows when to handle an image request.

Returns

Implements ImageResizer.Plugins.IQuerystringPlugin.

Definition at line 124 of file IEPngFix.cs.

                                                                 {
            return new string[] { "iefix" };
        }

static bool ImageResizer.Plugins.Basic.IEPngFix.NeedsPngFix ( HttpContext  context )

inlinestatic

Returns true if the user agent string specifies MSIE versions 1 through 6 for Windows. Cached in context.Items after first call.

Parameters

context

Returns

Definition at line 113 of file IEPngFix.cs.

                                                            {

            if (context == null || context.Request == null || string.IsNullOrEmpty(context.Request.UserAgent)) return false;
            if (context.Items["isIE6orlower"] == null) {
                bool needsFix = ie456.IsMatch(context.Request.UserAgent);
                context.Items["isIE6orlower"] = needsFix;
                return needsFix;
            }
            return (bool)context.Items["isIE6orlower"];
        }

Property Documentation

bool ImageResizer.Plugins.Basic.IEPngFix.CatchAll

getset

If true, 'iefix=true' will be the default for all PNG images, instead of 'iefix=false'.

Definition at line 32 of file IEPngFix.cs.

bool ImageResizer.Plugins.Basic.IEPngFix.Redirect

getset

If true, the requests from IE will be HTTP redirected to new URLs. If false, the GIF will be silently served instead of the PNG, without any redirection. A CDN or caching proxy will mess things up regardless, but using redirection ensures that the CDN/proxy never caches the GIF version instead of the PNG.

Definition at line 43 of file IEPngFix.cs.

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The documentation for this class was generated from the following file:

• C:/Users/nathanael/Documents/resizer/Core/Plugins/Basic/IEPngFix.cs