I am using a formview with an ObjectDatasourc e in ASP .Net 2.0. Everything
works fine until I try the delete. The ItemDeleting event fires, so I know
it should fire my delete method, but instead I get an error: No parameterless
constructor defined for this object, and the delete method is never called.
Anyone have any ideas?
4  14319 
I thought the stack trace may help on this
[MissingMethodEx ception: No parameterless constructor defined for this
object.]
System.RuntimeT ypeHandle.Creat eInstance(Runti meType type, Boolean
publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHa ndle& ctor,
Boolean& bNeedSecurityCh eck) +0
System.RuntimeT ype.CreateInsta nceSlow(Boolean publicOnly, Boolean
fillCache) +103
System.RuntimeT ype.CreateInsta nceImpl(Boolean publicOnly, Boolean
skipVisibilityC hecks, Boolean fillCache) +261
System.Activato r.CreateInstanc e(Type type, Boolean nonPublic) +66
System.Web.UI.W ebControls.Obje ctDataSourceVie w.InvokeMethod( ObjectDataSourc eMethod method, Boolean disposeInstance , Object& instance) +127
System.Web.UI.W ebControls.Obje ctDataSourceVie w.InvokeMethod( ObjectDataSourc eMethod method) +38
System.Web.UI.W ebControls.Obje ctDataSourceVie w.ExecuteDelete (IDictionary
keys, IDictionary oldValues) +1110
System.Web.UI.D ataSourceView.D elete(IDictiona ry keys, IDictionary
oldValues, DataSourceViewO perationCallbac k callback) +75
System.Web.UI.W ebControls.Form View.HandleDele te(String commandArg) +855
System.Web.UI.W ebControls.Form View.HandleEven t(EventArgs e, Boolean
causesValidatio n, String validationGroup ) +784
System.Web.UI.W ebControls.Form View.OnBubbleEv ent(Object source, EventArgs
e) +95
System.Web.UI.C ontrol.RaiseBub bleEvent(Object source, EventArgs args) +35
System.Web.UI.W ebControls.Form ViewRow.OnBubbl eEvent(Object source,
EventArgs e) +109
System.Web.UI.C ontrol.RaiseBub bleEvent(Object source, EventArgs args) +35
System.Web.UI.W ebControls.Link Button.OnComman d(CommandEventA rgs e) +115
System.Web.UI.W ebControls.Link Button.RaisePos tBackEvent(Stri ng
eventArgument) +134
System.Web.UI.W ebControls.Link Button.System.W eb.UI.IPostBack EventHandler.Ra isePostBackEven t(String eventArgument) +7
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument) +11
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData) +180
System.Web.UI.P age.ProcessRequ estMain(Boolean
includeStagesBe foreAsyncPoint, Boolean includeStagesAf terAsyncPoint) +5670
Without seeing some code, I cannot be 100% sure, but here is a hint that may
help you solve the issue:
The exception is stating you do not have a default constructor on an object,
so it cannot create the object in question without parameters, which are not
supplied in this context.
Step through your code and examine the call stack at the point the exception
is thrown. This will show the point of failure.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
*************** ************
Think Outside the Box!
*************** ************
"John Bailey" wrote: I am using a formview with an ObjectDatasourc e in ASP .Net 2.0. Everything
works fine until I try the delete. The ItemDeleting event fires, so I know
it should fire my delete method, but instead I get an error: No parameterless
constructor defined for this object, and the delete method is never called.
Anyone have any ideas?
First of all, thank you for replying.
I posted the stack trace in a reply to my original message. The problem is
that the error is being generating outside of my code. I have developed
another theory, but have not had the opportunity to test it. When I first
set this up, I got an error saying that the objectdatasourc e could not find a
method with the parameters oringal_Key, Key. My delete method originally
only took the Key as a parameter. I changed this and then got the default
constructor error. I am thinking that they key field may be setup as
read/write when it should be readonly or something to that effect.
Does that sound plausible?
"Cowboy (Gregory A. Beamer) - MVP" wrote: Without seeing some code, I cannot be 100% sure, but here is a hint that may
help you solve the issue:
The exception is stating you do not have a default constructor on an object,
so it cannot create the object in question without parameters, which are not
supplied in this context.
Step through your code and examine the call stack at the point the exception
is thrown. This will show the point of failure.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
*************** ************
Think Outside the Box!
*************** ************
"John Bailey" wrote:
I am using a formview with an ObjectDatasourc e in ASP .Net 2.0. Everything
works fine until I try the delete. The ItemDeleting event fires, so I know
it should fire my delete method, but instead I get an error: No parameterless
constructor defined for this object, and the delete method is never called.
Anyone have any ideas?
Boy, now I feel like an idiot. My delete method was not shared, so the
objectdatasourc e was creating an instance of the object automatically. The
object class did not have a default constructor, so it generated an error.
I made the method shared and it works perfectly.
"Cowboy (Gregory A. Beamer) - MVP" wrote: Without seeing some code, I cannot be 100% sure, but here is a hint that may
help you solve the issue:
The exception is stating you do not have a default constructor on an object,
so it cannot create the object in question without parameters, which are not
supplied in this context.
Step through your code and examine the call stack at the point the exception
is thrown. This will show the point of failure.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
*************** ************
Think Outside the Box!
*************** ************
"John Bailey" wrote:
I am using a formview with an ObjectDatasourc e in ASP .Net 2.0. Everything
works fine until I try the delete. The ItemDeleting event fires, so I know
it should fire my delete method, but instead I get an error: No parameterless
constructor defined for this object, and the delete method is never called.
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