Error when registering custom config section - Sitefinity - Front- & Back-End Development

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Posted by Community Admin on 27-Aug-2011 00:00

Hi All,

I have been trying to add a custom config section to SF4.1 using the example in the Developer Manual.

http://www.sitefinity.com/40/help/developers-guide/deep-dive-configuration-creating-configuration-classes.html

Regretfully I am running into a .net error when I add the following line for registering my config section to the Application_Start method of the global.asax.cs file.

protected void Application_Start(object sender, EventArgs e)

Telerik.Sitefinity.Abstractions.Bootstrapper.Initialized += new EventHandler<Telerik.Sitefinity.Data.ExecutedEventArgs>(Bootstrapper_Initialized);

Config.RegisterSection<Estate.Sitefinity4Extensions.Configuration.GoogleMaps.GoogleMapsConfig>();

protected void Bootstrapper_Initialized(object sender, Telerik.Sitefinity.Data.ExecutedEventArgs args)

Telerik.Sitefinity.Web.UI.Dialogs.RegisterDialog<Estate.Sitefinity4Extensions.Fields.ImageSelectorDialog>();

And this is the .net error I get.

Server Error in '/' Application.

--------------------------------------------------------------------------------

The type String cannot be constructed. You must configure the container to supply this value.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The type String cannot be constructed. You must configure the container to supply this value.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: The type String cannot be constructed. You must configure the container to supply this value.]

Telerik.Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.GuardTypeIsNonPrimitive(IBuilderContext context, SelectedConstructor selectedConstructor) +277

Telerik.Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.PreBuildUp(IBuilderContext context) +485

Telerik.Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) +434

Telerik.Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlanCreatorPolicy.CreatePlan(IBuilderContext context, NamedTypeBuildKey buildKey) +400

Telerik.Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context) +222

Telerik.Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) +434

Telerik.Microsoft.Practices.ObjectBuilder2.BuilderContext.NewBuildUp(NamedTypeBuildKey newBuildKey) +318

BuildUp_Telerik.Sitefinity.Configuration.ConfigManager(IBuilderContext ) +216

Telerik.Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context) +304

Telerik.Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) +434

Telerik.Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides) +440

[ResolutionFailedException: Resolution of the dependency failed, type = "Telerik.Sitefinity.Configuration.ConfigManager", name = "XmlConfigProvider".

Exception occurred while: while resolving.

Exception is: InvalidOperationException - The type String cannot be constructed. You must configure the container to supply this value.

-----------------------------------------------

At the time of the exception, the container was:

Resolving Telerik.Sitefinity.Configuration.ConfigManager,XmlConfigProvider

Resolving parameter "providerName" of constructor Telerik.Sitefinity.Configuration.ConfigManager(System.String providerName)

Resolving System.String,(none)

]

Telerik.Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name, IEnumerable`1 resolverOverrides) +546

Telerik.Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, String name, IEnumerable`1 resolverOverrides) +20

Telerik.Microsoft.Practices.Unity.UnityContainerExtensions.Resolve(IUnityContainer container, String name, ResolverOverride[] overrides) +91

Telerik.Sitefinity.Data.ManagerBase`1.GetManager(String providerName, String transactionName) +372

Telerik.Sitefinity.Services.InstallContext..ctor(String transactionName) +67

Telerik.Sitefinity.Services.SystemManager.Initialize() +255

Telerik.Sitefinity.Abstractions.Bootstrapper.RegisterRoutes(RouteCollection routes) +258

Telerik.Sitefinity.Abstractions.Bootstrapper.Bootstrap() +403

Telerik.Sitefinity.Web.SitefinityHttpModule.Init(HttpApplication context) +113

System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +582

System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +352

System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +405

System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +368

[HttpException (0x80004005): Resolution of the dependency failed, type = "Telerik.Sitefinity.Configuration.ConfigManager", name = "XmlConfigProvider".

Exception occurred while: while resolving.

Exception is: InvalidOperationException - The type String cannot be constructed. You must configure the container to supply this value.

-----------------------------------------------

At the time of the exception, the container was:

Resolving Telerik.Sitefinity.Configuration.ConfigManager,XmlConfigProvider

Resolving parameter "providerName" of constructor Telerik.Sitefinity.Configuration.ConfigManager(System.String providerName)

Resolving System.String,(none)

]

System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +646

System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +141

System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +771

--------------------------------------------------------------------------------

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Not sure on how to proceed with this. Any pointers would be be appreciated.

Regards,

David

Posted by Community Admin on 31-Aug-2011 00:00

Hello David Van Geel,

The code from our documentation needs to be slightly modified in order to work.
In the Global.asax you need to have:

protected void Application_Start(object sender, EventArgs e)

Bootstrapper.Initialized += new EventHandler<Telerik.Sitefinity.Data.ExecutedEventArgs>(Bootstrapper_Initialized);

void Bootstrapper_Initialized(object sender, Telerik.Sitefinity.Data.ExecutedEventArgs e)

if (e.CommandName == "Bootstrapped")

Config.RegisterSection<CarsConfig>();

instead of the code in the tutorial. Also, the CarsConfig should be modified to look like this:

public class CarsConfig : ConfigSection

[ConfigurationProperty("x", DefaultValue = "Def", IsRequired = false)]

[ObjectInfo(typeof(ConfigDescriptions), Title = "xx", Description = "xx")]

public string x

get

return this["x"].ToString();

set

this["x"] = value;

/// <summary>

/// Gets a collection of user-defined parameters for the provider.

/// </summary>

[ConfigurationProperty("parameters")]

public NameValueCollection Parameters

get

return (NameValueCollection)this["parameters"];

set

this["parameters"] = value;

///// <summary>

///// Gets or sets the programmatic name of the toolbox item.

///// </summary>

///// <value>The name.</value>

[ConfigurationProperty("name", DefaultValue = "", IsKey = true)]

[ObjectInfo(typeof(ConfigDescriptions), Title = "ItemNameCaption", Description = "ItemName")]

public string Name

get

return (string)this["name"];

set

this["name"] = value;

[ConfigurationProperty("new")]

[ObjectInfo(typeof(ConfigDescriptions), Title = "New", Description = "New")]

[ConfigurationCollection(typeof(CarSettings), AddItemName = "new")]

public ConfigElementDictionary<string, CarSettings> New

get

return (ConfigElementDictionary<string, CarSettings>)this["new"];

[ConfigurationProperty("old")]

[ObjectInfo(typeof(ConfigDescriptions), Title = "Old", Description = "Old")]

[ConfigurationCollection(typeof(CarSettings), AddItemName = "old")]

public ConfigElementDictionary<string, CarSettings> Old

get

return (ConfigElementDictionary<string, CarSettings>)this["old"];

protected override void OnPropertiesInitialized()

base.OnPropertiesInitialized();

this.New.Add(new CarSettings(this.New)

Name = "BMW",

Year = 2010

);

// reference - MSDN http://msdn.microsoft.com/en-us/library/ayybcxe5.aspx

[ConfigurationProperty("version", DefaultValue = null)]

[TypeConverter(typeof(StringVersionConverter))]

[ObjectInfo(typeof(ConfigDescriptions), Title = "VersionAttributeTitle", Description = "VersionAttributeDescription")]

public Version Version

get

return (Version)this["version"];

set

this["version"] = value;

IDictionary<string, string> d;

ICollection<string> c;

and also CarSettings:

public class CarSettings : ConfigElement

// You must have a constructor with ConfigElement parameter that accepts the parent

public CarSettings(ConfigElement parent)

: base(parent)

[ConfigurationProperty("name", DefaultValue = "", IsRequired = true, IsKey = true)]

public string Name

get

return (string)this["name"];

set

this["name"] = value;

[ConfigurationProperty("year", DefaultValue = 0, IsRequired = true)]

public int Year

get

return (int)this["year"];

set

this["year"] = value;

Feel free to modify it in order to suit your needs.

Best wishes,
Victor Velev
the Telerik team

Thank you for being the most amazing .NET community! Your unfailing support is what helps us charge forward! We'd appreciate your vote for Telerik in this year's DevProConnections Awards. We are competing in mind-blowing 20 categories and every vote counts! VOTE for Telerik NOW >>

Posted by Community Admin on 01-Sep-2011 00:00

Sorry Victor,

That didn't help much. Anyway I got a bit further by adding a resource class with texts for a title and description for each of the properties in the associated configsection class.

So in the configsection class I have something like this.

[ConfigurationProperty("apikey", DefaultValue = "", IsRequired = true)]

[ObjectInfo(typeof(GoogleMapsConfigDescriptions), Title = "ApiKeyTitle", Description = "ApiKeyDescription")]

public string ApiKey

get

return this["apikey"].ToString();

set

this["apikey"] = value;

I then added the following lines to the GoogleMapsConfigDescriptions class.

[ResourceEntry("ApiKeyDescription", Value = "The API key.", Description = "The description of API key field.", LastModified = "2011/08/31")]

public string ApiKeyDescription get return this["ApiKeyDescription"];

[ResourceEntry("ApiKeyTitle", Value = "API key", Description = "The title of API key field.", LastModified = "2011/08/31")]

public string ApiKeyTitle get return this["ApiKeyTitle"];

That let me install the config section but when I try to open the section in the advanced settings I get the following error.

Property accessor 'Parameters' on object 'Estate.Sitefinity4Extensions.Configuration.GoogleMaps.GoogleMapsConfig' threw the following exception:'Config element null instance'

Note that I see that error only by using FireBug in FF when looking at the following call.

http://www.mijnwebsite.local/Sitefinity/Services/Configuration/ConfigSectionItems.svc/?nodeName=googleMapsConfig_0&policyHandlerName=&policyName=&mode=Navigation

I have tried to get at this error using the VS 2010 debugger. VS mentions that the following line generates the "Config element null instance" error.

/// <summary>

/// Gets a collection of user-defined parameters for the provider.

/// </summary>

[ConfigurationProperty("parameters")]

public NameValueCollection Parameters

get

return (NameValueCollection)this["parameters"]; <!------ this line generates the error.

set

this["parameters"] = value;

The thing that has me stumped is this["parameters"] is not null. I hope someone has some idea what is happening.

Regards,
David

To give you an idea what I am trying to do I'll mention the entire configsection class here.

namespace Estate.Sitefinity4Extensions.Configuration.GoogleMaps

using System;

using System.Collections.Specialized;

using System.ComponentModel;

using System.Configuration;

using Telerik.Sitefinity.Configuration;

using Telerik.Sitefinity.Localization;

using Telerik.Sitefinity.Utilities.TypeConverters;

using Telerik.Sitefinity.Web.Configuration;

using System.Collections.Generic;

public class GoogleMapsConfig : ConfigSection

public string ApiUrl

get

return "http://maps.google.com/maps?file=api&v=2";

[ConfigurationProperty("apikey", DefaultValue = "", IsRequired = true)]

[ObjectInfo(typeof(GoogleMapsConfigDescriptions), Title = "ApiKeyTitle", Description = "ApiKeyDescription")]

public string ApiKey

get

return this["apikey"].ToString();

set

this["apikey"] = value;

[ConfigurationProperty("url", DefaultValue = "", IsRequired = true)]

[ObjectInfo(typeof(GoogleMapsConfigDescriptions), Title = "UrlTitle", Description = "UrlDescription")]

public string Url

get

return this["url"].ToString();

set

this["url"] = value;

/// <summary>

/// Gets a collection of user-defined parameters for the provider.

/// </summary>

[ConfigurationProperty("parameters")]

public NameValueCollection Parameters

get

return (NameValueCollection)this["parameters"];

set

this["parameters"] = value;

[ConfigurationProperty("New")]

[ObjectInfo(typeof(GoogleMapsConfigDescriptions), Title = "NewTitle", Description = "NewDescription")]

[ConfigurationCollection(typeof(GoogleMapsSettings), AddItemName = "New")]

public ConfigElementDictionary<string, GoogleMapsSettings> New

get

return (ConfigElementDictionary<string, GoogleMapsSettings>)this["new"];

[ConfigurationProperty("Old")]

[ObjectInfo(typeof(GoogleMapsConfigDescriptions), Title = "OldTitle", Description = "OldDescription")]

[ConfigurationCollection(typeof(GoogleMapsSettings), AddItemName = "Old")]

public ConfigElementDictionary<string, GoogleMapsSettings> Old

get

return (ConfigElementDictionary<string, GoogleMapsSettings>)this["old"];

protected override void OnPropertiesInitialized()

base.OnPropertiesInitialized();

this.New.Add(new GoogleMapsSettings(this.New)

Url = "Website",

Apikey = "Not set"

);

[ConfigurationProperty("version", DefaultValue = null)]

[TypeConverter(typeof(StringVersionConverter))]

[ObjectInfo(typeof(ConfigDescriptions), Title = "VersionAttributeTitle", Description = "VersionAttributeDescription")]

public Version Version

get

return (Version)this["version"];

set

this["version"] = value;

IDictionary<string, string> d;

ICollection<string> c;

And the associated configelement class.

namespace Estate.Sitefinity4Extensions.Configuration.GoogleMaps

using System.Configuration;

using Telerik.Sitefinity.Configuration;

public class GoogleMapsSettings : ConfigElement

public GoogleMapsSettings(ConfigElement parent)

: base(parent)

[ConfigurationProperty("apikey", DefaultValue = "", IsRequired = true)]

public string Apikey

get

return (string)this["apikey"];

set

this["apikey"] = value;

[ConfigurationProperty("url", DefaultValue = "", IsRequired = true, IsKey = true)]

public string Url

get

return (string)this["url"];

set

this["url"] = value;

Posted by Community Admin on 06-Sep-2011 00:00

Hello David Van Geel,

Can you open a support ticket and submit all files related to the custom configuration so we can try and set it up locally.

Kind regards,
Victor Velev
the Telerik team

This thread is closed