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.NET Forum / ASP.NET / Building Controls / June 2004Saving a Collection to ViewState
I built a webcontrol and within the control I build a collection of properties I would Like to store so I do not have to rebuild it everytime there is a postback. I store the collection in viewstate and get the following error when I run a page with my control on it: The Type 'myCollection' must be marked as Serializable or have a TypeConverter other than ReferenceConverter to be put in viewstate. I store all my other custom properties in viewstate, but accessing myCollection from the viewstate becomes an error. I know that myCollection is not a basic type, while the other properties are, but is there a way to save the collection without having to rebuild it everytime there is a postback? Thanks... Hi, you need to mark your collection or derived classes, if exist, with Serialization attribute. Natty Gur[MVP] blog : http://weblogs.asp.net/ngur Mobile: +972-(0)52-8888377 Before the Class that I use into a collection I marked it with <Serializable()> and it still does not work... Any ideas why not? Thanks > Hi, > [quoted text clipped - 8 lines] > *** Sent via Devdex http://www.devdex.com *** > Don't just participate in USENET...get rewarded for it! I think you will need to implement some custom serializers. The framework does not know to to serialize every possible class type that you can create. I've not done this but I think that's what it is. My suggestion is to throw the stuff into something that is natively serializable. Add the salient parts of the collection to an ArrayList or a DataTable or something and shove it ViewState or Session. Andrew > Before the Class that I use into a collection I marked it with <Serializable()> and it still does not work... > [quoted text clipped - 14 lines] > > *** Sent via Devdex http://www.devdex.com *** > > Don't just participate in USENET...get rewarded for it! Take a look at this[1] post to learn how the viewstate serializer works and what you can do in order to get your data serialized fast and with the smallest possible footprint. [1] http://weblogs.asp.net/vga/archive/2004/05/11/DontLetTheBinaryFormatterGetAtIt.aspx  SignatureVictor Garcia Aprea Microsoft MVP | ASP.NET Looking for insights on ASP.NET? Read my blog: http://obies.com/vga/blog.aspx > I think you will need to implement some custom serializers. The framework does not know to to serialize every possible class type that you can create. I've not done this but I think that's what it is. > My suggestion is to throw the stuff into something that is natively serializable. Add the salient parts of the collection to an ArrayList or a DataTable or something and shove it ViewState or Session. > Andrew > [quoted text clipped - 16 lines] > > > *** Sent via Devdex http://www.devdex.com *** > > > Don't just participate in USENET...get rewarded for it! Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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