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Collection Property in web custom controlI'm building a custom control. I would like that on the control you can set some 'rights' For that I have an enum: public enum GroupRights { Group0 = 0, Group1 = 1, Group2 = 2, Group3 = 3, Group4 = 4, Group5 = 5, } In design time I want to set these right (can be multiple rights at the same time) So I put them in a generic list: [Category("Rights")] [DefaultValue("")] [Localizable(true)] [Bindable(true)] public List<GroupRights> ControlRights { get { List<GroupRights> temp = (List<GroupRights>)ViewState["ControlRights"]; return ((object)temp == null) ? new List<GroupRights>() : temp; } set { ViewState["ControlRights"] = value; }} In desgin time I get the controls window with the GrouRights enum to choose from. But when I add one right in the collection window I get the message: Cannot create an object of type 'System.Collections.Generic.List`1[[GroupRights, MaxControls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its string representation '(Collection)' for the 'ControlRights' property. Also the property can not be read out during runtime. What am I doing wrong or forgetting? tia, Class Your class must be serializible. Or use Session instead of ViewState.
Sincerely yours, Michael B. Tkachev. m_tkac***@hotmail.com Show quoteHide quote "Class" <NoSpam@Class> wrote in message news:eOfpVChOHHA.2140@TK2MSFTNGP03.phx.gbl... > Hi all, > > I'm building a custom control. I would like that on the control you can > set some 'rights' > For that I have an enum: > public enum GroupRights > > { > Group0 = 0, > Group1 = 1, > Group2 = 2, > Group3 = 3, > Group4 = 4, > Group5 = 5, > } > > In design time I want to set these right (can be multiple rights at the > same time) > So I put them in a generic list: > > [Category("Rights")] > [DefaultValue("")] > [Localizable(true)] > [Bindable(true)] > public List<GroupRights> ControlRights > { > get > { > List<GroupRights> temp = (List<GroupRights>)ViewState["ControlRights"]; > return ((object)temp == null) ? new List<GroupRights>() : temp; > } > > set > { > ViewState["ControlRights"] = value; > }} > > In desgin time I get the controls window with the GrouRights enum to > choose from. > But when I add one right in the collection window I get the message: > > Cannot create an object of type > 'System.Collections.Generic.List`1[[GroupRights, MaxControls, > Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its string > representation '(Collection)' for the 'ControlRights' property. > > Also the property can not be read out during runtime. > > What am I doing wrong or forgetting? > > tia, > > Class > > > Hi Michael,
Thanks for your response. > Your class must be serializible. Or use Session instead of ViewState. Which class do you mean, that needs to be serializable?The enum? or The List class? The list is a generic .NET collection class which is serializable already, right? Session?? There is no Session object in a web custom control, what do you mean?? Thanks, Class Show quoteHide quote "Michael Tkachev" <m_tkac***@hotmail.com> wrote in message news:uqGLwsjOHHA.140@TK2MSFTNGP04.phx.gbl... > Your class must be serializible. Or use Session instead of ViewState. > > Sincerely yours, > Michael B. Tkachev. > m_tkac***@hotmail.com > > "Class" <NoSpam@Class> wrote in message > news:eOfpVChOHHA.2140@TK2MSFTNGP03.phx.gbl... >> Hi all, >> >> I'm building a custom control. I would like that on the control you can >> set some 'rights' >> For that I have an enum: >> public enum GroupRights >> >> { >> Group0 = 0, >> Group1 = 1, >> Group2 = 2, >> Group3 = 3, >> Group4 = 4, >> Group5 = 5, >> } >> >> In design time I want to set these right (can be multiple rights at the >> same time) >> So I put them in a generic list: >> >> [Category("Rights")] >> [DefaultValue("")] >> [Localizable(true)] >> [Bindable(true)] >> public List<GroupRights> ControlRights >> { >> get >> { >> List<GroupRights> temp = (List<GroupRights>)ViewState["ControlRights"]; >> return ((object)temp == null) ? new List<GroupRights>() : temp; >> } >> >> set >> { >> ViewState["ControlRights"] = value; >> }} >> >> In desgin time I get the controls window with the GrouRights enum to >> choose from. >> But when I add one right in the collection window I get the message: >> >> Cannot create an object of type >> 'System.Collections.Generic.List`1[[GroupRights, MaxControls, >> Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its string >> representation '(Collection)' for the 'ControlRights' property. >> >> Also the property can not be read out during runtime. >> >> What am I doing wrong or forgetting? >> >> tia, >> >> Class >> >> >> > > Take the "Page" property and there you can find Session
Show quoteHide quote "Class" <NoSpam@Class> wrote in message news:u0IHW7jOHHA.4100@TK2MSFTNGP04.phx.gbl... > Hi Michael, > > Thanks for your response. > >> Your class must be serializible. Or use Session instead of ViewState. > > Which class do you mean, that needs to be serializable? > The enum? or The List class? > The list is a generic .NET collection class which is serializable already, > right? > Session?? There is no Session object in a web custom control, what do you > mean?? > > Thanks, > Class > > "Michael Tkachev" <m_tkac***@hotmail.com> wrote in message > news:uqGLwsjOHHA.140@TK2MSFTNGP04.phx.gbl... >> Your class must be serializible. Or use Session instead of ViewState. >> >> Sincerely yours, >> Michael B. Tkachev. >> m_tkac***@hotmail.com >> >> "Class" <NoSpam@Class> wrote in message >> news:eOfpVChOHHA.2140@TK2MSFTNGP03.phx.gbl... >>> Hi all, >>> >>> I'm building a custom control. I would like that on the control you can >>> set some 'rights' >>> For that I have an enum: >>> public enum GroupRights >>> >>> { >>> Group0 = 0, >>> Group1 = 1, >>> Group2 = 2, >>> Group3 = 3, >>> Group4 = 4, >>> Group5 = 5, >>> } >>> >>> In design time I want to set these right (can be multiple rights at the >>> same time) >>> So I put them in a generic list: >>> >>> [Category("Rights")] >>> [DefaultValue("")] >>> [Localizable(true)] >>> [Bindable(true)] >>> public List<GroupRights> ControlRights >>> { >>> get >>> { >>> List<GroupRights> temp = (List<GroupRights>)ViewState["ControlRights"]; >>> return ((object)temp == null) ? new List<GroupRights>() : temp; >>> } >>> >>> set >>> { >>> ViewState["ControlRights"] = value; >>> }} >>> >>> In desgin time I get the controls window with the GrouRights enum to >>> choose from. >>> But when I add one right in the collection window I get the message: >>> >>> Cannot create an object of type >>> 'System.Collections.Generic.List`1[[GroupRights, MaxControls, >>> Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its string >>> representation '(Collection)' for the 'ControlRights' property. >>> >>> Also the property can not be read out during runtime. >>> >>> What am I doing wrong or forgetting? >>> >>> tia, >>> >>> Class >>> >>> >>> >> >> > > Whoa, Whoa, Whoa, Whoa.
Remember that a session should only be used to store information when this information is stored on a "per" user basis. What if you have 30 of these controls on a single web page and the user is browsing 2 different web pages at the same time ont he same site under the same session. That's 60 controls overwriting each other. Class, what is happening is the fact that you are trying to serialize Enums. Your first step should be to convert your List<EnumRights> to a enumrights[], this is done through the .ToArray() method. Do this when you save your items in the viewstaet. When you load your viewstaet you can create a new List<EnumRights> by using the MyEnumRights = new List<EnumRights>((List<Enumrights>) viewstate["bleah"]); The Constructor overload for a List<> accepts Ienumerable which a type[] implements so this works. This should solve all of your serialization problems. Worst case scenario - you may have to, assuming your enums have values, convert it to an array of integers - but I don't think you have to do this. Show quoteHide quote "Michael Tkachev" wrote: > Take the "Page" property and there you can find Session > > "Class" <NoSpam@Class> wrote in message > news:u0IHW7jOHHA.4100@TK2MSFTNGP04.phx.gbl... > > Hi Michael, > > > > Thanks for your response. > > > >> Your class must be serializible. Or use Session instead of ViewState. > > > > Which class do you mean, that needs to be serializable? > > The enum? or The List class? > > The list is a generic .NET collection class which is serializable already, > > right? > > Session?? There is no Session object in a web custom control, what do you > > mean?? > > > > Thanks, > > Class > > > > "Michael Tkachev" <m_tkac***@hotmail.com> wrote in message > > news:uqGLwsjOHHA.140@TK2MSFTNGP04.phx.gbl... > >> Your class must be serializible. Or use Session instead of ViewState. > >> > >> Sincerely yours, > >> Michael B. Tkachev. > >> m_tkac***@hotmail.com > >> > >> "Class" <NoSpam@Class> wrote in message > >> news:eOfpVChOHHA.2140@TK2MSFTNGP03.phx.gbl... > >>> Hi all, > >>> > >>> I'm building a custom control. I would like that on the control you can > >>> set some 'rights' > >>> For that I have an enum: > >>> public enum GroupRights > >>> > >>> { > >>> Group0 = 0, > >>> Group1 = 1, > >>> Group2 = 2, > >>> Group3 = 3, > >>> Group4 = 4, > >>> Group5 = 5, > >>> } > >>> > >>> In design time I want to set these right (can be multiple rights at the > >>> same time) > >>> So I put them in a generic list: > >>> > >>> [Category("Rights")] > >>> [DefaultValue("")] > >>> [Localizable(true)] > >>> [Bindable(true)] > >>> public List<GroupRights> ControlRights > >>> { > >>> get > >>> { > >>> List<GroupRights> temp = (List<GroupRights>)ViewState["ControlRights"]; > >>> return ((object)temp == null) ? new List<GroupRights>() : temp; > >>> } > >>> > >>> set > >>> { > >>> ViewState["ControlRights"] = value; > >>> }} > >>> > >>> In desgin time I get the controls window with the GrouRights enum to > >>> choose from. > >>> But when I add one right in the collection window I get the message: > >>> > >>> Cannot create an object of type > >>> 'System.Collections.Generic.List`1[[GroupRights, MaxControls, > >>> Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its string > >>> representation '(Collection)' for the 'ControlRights' property. > >>> > >>> Also the property can not be read out during runtime. > >>> > >>> What am I doing wrong or forgetting? > >>> > >>> tia, > >>> > >>> Class > >>> > >>> > >>> > >> > >> > > > > > > > Hi Nathaniel,
Thank you for your response. When I try your suggestion and I try to add a right in the colleciton Editor: 'Unable to cast object of type 'System.Collections.Generic.List`1[GroupRights]' to type 'System.Collections.Generic.List`1[GroupRights]'' This is the code I have now: public List<GroupRights> Rights { get { if (ViewState["Rights"] != null) { List<GroupRights> s = new List<GroupRights>((IEnumerable<GroupRights>)ViewState["Rights"]); return ((s == null) ? new List<GroupRights>() : s); } else { return null; } } set { if (value != null) ViewState["Rights"] = value.ToArray(); else { List<GroupRights> s = new List<GroupRights>(); s.Add((GroupRights)1); ViewState["LikMe"] = s; } } } Regards, Maarten Show quoteHide quote "Nathaniel Greene" <Nathaniel.Greene@community.nospam> wrote in message news:B085FCF8-A6CF-469E-AD2D-57464ECC9D91@microsoft.com... > Whoa, Whoa, Whoa, Whoa. > Remember that a session should only be used to store information when this > information is stored on a "per" user basis. What if you have 30 of these > controls on a single web page and the user is browsing 2 different web > pages > at the same time ont he same site under the same session. That's 60 > controls > overwriting each other. > > Class, what is happening is the fact that you are trying to serialize > Enums. > Your first step should be to convert your List<EnumRights> to a > enumrights[], > this is done through the .ToArray() method. > Do this when you save your items in the viewstaet. When you load your > viewstaet you can create a new List<EnumRights> by using the > MyEnumRights = new List<EnumRights>((List<Enumrights>) > viewstate["bleah"]); > > The Constructor overload for a List<> accepts Ienumerable which a type[] > implements so this works. This should solve all of your serialization > problems. Worst case scenario - you may have to, assuming your enums have > values, convert it to an array of integers - but I don't think you have to > do > this. > > > > "Michael Tkachev" wrote: > >> Take the "Page" property and there you can find Session >> >> "Class" <NoSpam@Class> wrote in message >> news:u0IHW7jOHHA.4100@TK2MSFTNGP04.phx.gbl... >> > Hi Michael, >> > >> > Thanks for your response. >> > >> >> Your class must be serializible. Or use Session instead of ViewState. >> > >> > Which class do you mean, that needs to be serializable? >> > The enum? or The List class? >> > The list is a generic .NET collection class which is serializable >> > already, >> > right? >> > Session?? There is no Session object in a web custom control, what do >> > you >> > mean?? >> > >> > Thanks, >> > Class >> > >> > "Michael Tkachev" <m_tkac***@hotmail.com> wrote in message >> > news:uqGLwsjOHHA.140@TK2MSFTNGP04.phx.gbl... >> >> Your class must be serializible. Or use Session instead of ViewState. >> >> >> >> Sincerely yours, >> >> Michael B. Tkachev. >> >> m_tkac***@hotmail.com >> >> >> >> "Class" <NoSpam@Class> wrote in message >> >> news:eOfpVChOHHA.2140@TK2MSFTNGP03.phx.gbl... >> >>> Hi all, >> >>> >> >>> I'm building a custom control. I would like that on the control you >> >>> can >> >>> set some 'rights' >> >>> For that I have an enum: >> >>> public enum GroupRights >> >>> >> >>> { >> >>> Group0 = 0, >> >>> Group1 = 1, >> >>> Group2 = 2, >> >>> Group3 = 3, >> >>> Group4 = 4, >> >>> Group5 = 5, >> >>> } >> >>> >> >>> In design time I want to set these right (can be multiple rights at >> >>> the >> >>> same time) >> >>> So I put them in a generic list: >> >>> >> >>> [Category("Rights")] >> >>> [DefaultValue("")] >> >>> [Localizable(true)] >> >>> [Bindable(true)] >> >>> public List<GroupRights> ControlRights >> >>> { >> >>> get >> >>> { >> >>> List<GroupRights> temp = >> >>> (List<GroupRights>)ViewState["ControlRights"]; >> >>> return ((object)temp == null) ? new List<GroupRights>() : temp; >> >>> } >> >>> >> >>> set >> >>> { >> >>> ViewState["ControlRights"] = value; >> >>> }} >> >>> >> >>> In desgin time I get the controls window with the GrouRights enum to >> >>> choose from. >> >>> But when I add one right in the collection window I get the message: >> >>> >> >>> Cannot create an object of type >> >>> 'System.Collections.Generic.List`1[[GroupRights, MaxControls, >> >>> Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' from its >> >>> string >> >>> representation '(Collection)' for the 'ControlRights' property. >> >>> >> >>> Also the property can not be read out during runtime. >> >>> >> >>> What am I doing wrong or forgetting? >> >>> >> >>> tia, >> >>> >> >>> Class >> >>> >> >>> >> >>> >> >> >> >> >> > >> > >> >> >> 
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