[Mono-dev] AJAX Control Toolkit and System.NullReferenceException

[Miguel de Icaza]

Hello Jens,

    Do you have a self-contained test case that we could use to
reproduce the problem?

> Hello,
> 
>  
> 
> I am currently testing the "AJAX Control Toolkit". There are no
> problems with most of the controls, only a couple of
> 
> doesn't work at the moment. I want to use this Toolkit, so I am
> anxious to fix the occurring errors. I am new to mono,
> 
> so it's sometimes not easy to find and solve the problems. So far I
> have fixed two issues (maybe somebody of the 
> 
> development team want to know more about this?!).
> 
>  
> 
> Now, I am at a loss to fix the following error, can somebody help me,
> please. =)
> 
>  
> 
> System.NullReferenceException: Object reference not set to an instance
> of an object
> 
>   at System.ComponentModel.EditorAttribute..ctor (System.Type type,
> System.Type baseType) [0x00000]
> in /root/mono-svn/mcs/class/System/System.ComponentModel/EditorAttribute.cs:61 
> 
>   at <0x00000> <unknown method>
> 
>   at (wrapper managed-to-native)
> System.MonoCustomAttrs:GetCustomAttributesInternal
> (System.Reflection.ICustomAttributeProvider,System.Type,bool)
> 
>   at System.MonoCustomAttrs.GetCustomAttributesBase
> (ICustomAttributeProvider obj, System.Type attributeType) [0x00000]
> in /root/mono-svn/mcs/class/corlib/System/MonoCustomAttrs.cs:82 
> 
>   at System.MonoCustomAttrs.GetCustomAttributes
> (ICustomAttributeProvider obj, System.Type attributeType, Boolean
> inherit) [0x00012]
> in /root/mono-svn/mcs/class/corlib/System/MonoCustomAttrs.cs:120 
> 
>   at System.MonoCustomAttrs.GetCustomAttributes
> (ICustomAttributeProvider obj, Boolean inherit) [0x0002a]
> in /root/mono-svn/mcs/class/corlib/System/MonoCustomAttrs.cs:242 
> 
>   at System.Reflection.MonoProperty.GetCustomAttributes (Boolean
> inherit) [0x00000]
> in /root/mono-svn/mcs/class/corlib/System.Reflection/MonoProperty.cs:201 
> 
>   at System.ComponentModel.ReflectionPropertyDescriptor..ctor
> (System.Reflection.PropertyInfo info) [0x00000]
> in /root/mono-svn/mcs/class/System/System.ComponentModel/ReflectionPropertyDescriptor.cs:57 
> 
>   at System.ComponentModel.TypeInfo.GetProperties () [0x00040]
> in /root/mono-svn/mcs/class/System/System.ComponentModel/TypeDescriptor.cs:1077 
> 
>   at System.ComponentModel.TypeDescriptor.GetProperties (System.Object
> component, Boolean noCustomTypeDesc) [0x0004f]
> in /root/mono-svn/mcs/class/System/System.ComponentModel/TypeDescriptor.cs:667 
> 
>   at System.ComponentModel.TypeDescriptor.GetProperties (System.Object
> component) [0x00000]
> in /root/mono-svn/mcs/class/System/System.ComponentModel/TypeDescriptor.cs:623 
> 
>   at AjaxControlToolkit.ExtenderControlBase.CheckIfValid (Boolean
> throwException) [0x00000] 
> 
>   at AjaxControlToolkit.ExtenderControlBase.EnsureValid () [0x00000] 
> 
>   at AjaxControlToolkit.DynamicPopulateExtenderControlBase.EnsureValid
> () [0x00000] 
> 
>   at AjaxControlToolkit.ExtenderControlBase.GetScriptDescriptors
> (System.Web.UI.Control targetControl) [0x00000] 
> 
>   at
> System.Web.UI.ExtenderControl.System.Web.UI.IExtenderControl.GetScriptDescriptors (System.Web.UI.Control targetControl) [0x00000] 
> 
>   at System.Web.UI.ScriptManager.RegisterScriptDescriptors
> (IExtenderControl extenderControl) [0x00000] 
> 
>   at System.Web.UI.ExtenderControl.Render
> (System.Web.UI.HtmlTextWriter writer) [0x00000] 
> 
>   at AjaxControlToolkit.ExtenderControlBase.Render
> (System.Web.UI.HtmlTextWriter writer) [0x00000] 
> 
>   at System.Web.UI.Control.RenderControl (System.Web.UI.HtmlTextWriter
> writer) [0x00048]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1256 
> 
>   at System.Web.UI.Control.RenderChildren
> (System.Web.UI.HtmlTextWriter writer) [0x00073]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1116 
> 
>   at System.Web.UI.HtmlControls.HtmlForm.RenderChildren
> (System.Web.UI.HtmlTextWriter w) [0x00034]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlForm.cs:338 
> 
>   at System.Web.UI.HtmlControls.HtmlContainerControl.Render
> (System.Web.UI.HtmlTextWriter writer) [0x00007]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlContainerControl.cs:124 
> 
>   at System.Web.UI.HtmlControls.HtmlForm.Render
> (System.Web.UI.HtmlTextWriter w) [0x00000]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlForm.cs:358 
> 
>   at System.Web.UI.Control.RenderControl (System.Web.UI.HtmlTextWriter
> writer) [0x00048]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1256 
> 
>   at System.Web.UI.HtmlControls.HtmlForm.RenderControl
> (System.Web.UI.HtmlTextWriter w) [0x00000]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlForm.cs:347 
> 
>   at System.Web.UI.Control.RenderChildren
> (System.Web.UI.HtmlTextWriter writer) [0x00073]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1116 
> 
>   at System.Web.UI.Control.Render (System.Web.UI.HtmlTextWriter
> writer) [0x00000]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1092 
> 
>   at System.Web.UI.Page.Render (System.Web.UI.HtmlTextWriter writer)
> [0x0015c]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Page.cs:1001 
> 
>   at System.Web.UI.Control.RenderControl (System.Web.UI.HtmlTextWriter
> writer) [0x00048]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Control.cs:1256 
> 
>   at System.Web.UI.Page.InternalProcessRequest () [0x003ec]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Page.cs:1438 
> 
>   at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext
> context) [0x00058]
> in /root/mono-svn/mcs/class/System.Web/System.Web.UI/Page.cs:1202
> 
>  
> 
> Regards
> 
> Jens
> 
> 
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