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SharePoint 2010 - Error getting an attempt to use SPWebConfigModification

I am creating a SharePoint function, and in my FeatureReceiver I am trying to add SPWebConfigModification . I followed the approach described in this blog post.

Here is a snippet from my function receiver:

 public override void FeatureActivated(SPFeatureReceiverProperties properties) { var webApp = (SPWebApplication)properties.Feature.Parent; var debugMode = new SPWebConfigModification { Path = "configuration/system.web/customErrors", Name = "mode", Value = "Off", Sequence = 0, Type = SPWebConfigModification.SPWebConfigModificationType.EnsureAttribute, Owner = "MyWebConfigMods" }; webApp.WebConfigModifications.Add(debugMode); // <------ Error is thrown at this line webApp.WebService.ApplyWebConfigModifications(); webApp.Update(); }

Here is the stack trace from the error, as shown in the SharePoint ULS Viewer:

 Feature receiver assembly 'MyCompany.SharePoint, Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxxxx', class 'MyCompany.SharePoint.Features.WebConfig.WebConfigFeatureReceiver', method 'FeatureActivated' for feature '3a07b91c-0968-4f14-b2bc-ae0e3f109cf9' threw an exception: System.Xml.XPath.XPathException: '' is an invalid expression. at MS.Internal.Xml.XPath.XPathScanner..ctor(String xpathExpr) at MS.Internal.Xml.XPath.XPathParser.ParseXPathExpresion(String xpathExpresion) at MS.Internal.Xml.XPath.QueryBuilder.Build(String query, Boolean allowVar, Boolean allowKey) at System.Xml.XPath.XPathExpression.Compile(String xpath, IXmlNamespaceResolver nsResolver) at System.Xml.XPath.XPathNavigator.Select(String xpath) at System.Xml.XmlNode.SelectSingleNode(String xpath) at Microsoft.SharePoint.Administration.SPWebConfigFileChanges.ApplyModificationsWebConfigXmlDocument(XmlDocument xdWebConfig, String filepath) at Microsoft.SharePoint.Administration.SPWebApplication.ApplyWebConfigModifications() at Microsoft.SharePoint.Administration.SPWebService.ApplyWebConfigModifications() at MyCompany.SharePoint.WebConfigModificationFeatureReceiver.FeatureActivated(SPFeatureReceiverProperties properties) at Microsoft.SharePoint.SPFeature.DoActivationCallout(Boolean fActivate, Boolean fForce)

Somewhere during the upgrade, an empty path references an XPath expression. This is not in my function. Any ideas?

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3 answers

customErrors does not have an attribute named debug, you must reference the compilation element

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This is the code we use:

  SPWebApplication wappCurrent = (SPWebApplication)properties.Feature.Parent; SPWebConfigModification modAuthorizedType = new SPWebConfigModification(); modAuthorizedType.Name = "authorizedType[@Assembly='Infowise.AssociatedTasks, Version=1.0.0.0, Culture=neutral, PublicKeyToken=23853b1f8d5855a5']"; modAuthorizedType.Owner = "Infowise.Actions"; modAuthorizedType.Path = "configuration/System.Workflow.ComponentModel.WorkflowCompiler/authorizedTypes"; modAuthorizedType.Type = SPWebConfigModification.SPWebConfigModificationType.EnsureChildNode; modAuthorizedType.Value = @"<authorizedType Assembly=""Infowise.AssociatedTasks, Version=1.0.0.0, Culture=neutral, PublicKeyToken=23853b1f8d5855a5"" Namespace=""Infowise.Sharepoint.V3.Fields.Workflow"" TypeName=""*"" Authorized=""True"" />"; wappCurrent.WebConfigModifications.Add(modAuthorizedType); wappCurrent.Update(); wappCurrent.Farm.Services.GetValue<SPWebService>().ApplyWebConfigModifications();

Hope if helps

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In my case, wappCurrent.WebConfigModifications has some old values ​​with an invalid Path property. Clearing the array fixes the problem.

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