delete feature using event receiver on a farm feature

Question

there is a farm feature and there is a web-scoped feature. web feature does stuff on multiple sites. If ever i want to get rid of the feature on all sites, I have a farm feature that has on deactivate following code, while on-activate is empty(no logic): Is there something wrong with my code?? I get "value does not fall within the expected range" error...

          public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
    {
        System.Diagnostics.Debugger.Break();

        SPSite tmpRoot = new SPSite("http://omac-spsdev01");
        SPSiteCollection tmpRootColl = tmpRoot.WebApplication.Sites;
        foreach (SPSite site in tmpRootColl)
        {
            foreach (SPWeb web in site.AllWebs)
            {
                string FeatureID = "5f71dfd4-20dd-432f-ae60-60e31f5e972b";
                //Get feature Guid  
                Guid myfeatureid = new Guid(FeatureID);

                //remove feature

                //SPFeatureCollection features = web.Features;
                //SPFeature myfeature = features[FeatureID];

                if (web.Features[myfeatureid] != null)   //Make sure Feature is installed!
                {
                    web.Features.Remove(myfeatureid);//deactivate feature
                }
                web.Dispose();
            }

            site.Dispose();
        }

    }

Can you provide a StackTrace, so we can see what line is actually causing the error?
I have updated the trace log.. I am so mad right now I wanna get to the bottom of this $hit

ToddersLegrande · Answer 1 · 2012-09-13 20:08:48Z

up vote 0 down vote

SPWeb.Features only contains activated features. If you call web.Features[myfeatureid]; on a web that does not have that feature activated then it will blow up in the exact manner you describe.

Updated with code - you want something like this:

if (oWeb.Features[id] != null)
{
     oWeb.Features.Remove(id);
}

(The looping I had talked about before was actually for event receivers and not features so I have since removed that remark - I apologize for the confusion)

edited Sep 13 '12 at 20:08

answered Sep 13 '12 at 18:47

ToddersLegrande
1,2491211

	I have updated my code, but it still throws the same error!!! please help! – Sarika thapaliya Sep 13 '12 at 19:05
	The updated code don't check if your feature is activated, it only checks that at least one feature is activated. In fact now it'll break on all sites as it'll try to deactivate you feature as many times as there are features activated – Per Jakobsen Sep 13 '12 at 19:54
	Will this do it? if ((myfeature != null) & (myfeature.DefinitionId==myfeatureid)) //Make sure Feature is installed! { web.Features.Remove(myfeatureid);//deactivate feature } – Sarika thapaliya Sep 13 '12 at 20:03
	Updated with code. Let me know how it works. – ToddersLegrande Sep 13 '12 at 20:08
	@ToddersLegrande Now I have a different error: "Object reference not set to an instance of an object.".. – Sarika thapaliya Sep 13 '12 at 20:50

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delete feature using event receiver on a farm feature

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