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POASP vb.net : How to dynamically change list bound to repeater
 

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  1. POASP vb.net : How to dynamically change list bound to repeater
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    <p>I would like to puplate a list dynamically, and bind it to an asp repeater which use a custom control.</p> <p>Here is my custom control (.acsx file) :</p> <pre><code>&lt;%@ Control Language="VB" ClassName="ControlCar" %&gt; &lt;script runat="server"&gt; Private m_car As Car = Nothing Public Property Car() As Car Get Car= m_car End Get Set(ByVal value As Car) m_car = value End Set End Property Protected Sub Panel_OnLoad(ByVal sender As Object, ByVal e As System.EventArgs) If Me.m_car Is Nothing Then lit_color.Text = "(m_car Is Nothing)" Else lit_color.Text = "color of Me.m_car is (" &amp; Me.m_car.Color &amp; ")" End If End Sub &lt;/script&gt; &lt;asp:Panel ID="panel" OnLoad="Panel_OnLoad" runat="server"&gt; this is a car&lt;br /&gt; color = &lt;asp:Literal ID="lit_color" runat="server"&gt;&lt;/asp:Literal&gt;&lt;br /&gt; &lt;br /&gt; &lt;/asp:Panel&gt; </code></pre> <p>So I create a repeater in my aspx file :</p> <pre><code>&lt;%@ Register TagPrefix="uc" TagName="ControlCar" Src="myfile.ascx" %&gt; &lt;asp:Repeater ID="id_repeater" runat="server"&gt; &lt;headertemplate&gt; &lt;/headertemplate&gt; &lt;itemtemplate&gt; &lt;uc:ControlCar id="ControlCarTemplate" Car=&lt;%# CType(Container.DataItem, Car)%&gt; runat="server" /&gt; &lt;/itemtemplate&gt; &lt;/asp:Repeater&gt; </code></pre> <p>List to populate repeater is declared :</p> <pre><code>Private Shared list_cars As ArrayList </code></pre> <p>On LoadPage event, I add one item in list :</p> <pre><code>If IsPostBack Then Return End If list_cars = New ArrayList() Dim car As Car = New Car car.Color = "red" list_cars .Add(car) id_repeater.DataSource = list_cars id_repeater.DataBind() </code></pre> <p>When I display page, I correctly see this :</p> <blockquote> <p>this is a car </p> <p>color = color of Me.m_car is (red)</p> </blockquote> <p><strong>OK, it works fine on load page event</strong></p> <p>But now, I want add item on button clic event defined here :</p> <pre><code>Sub OnClickAdd(ByVal sender As Object, ByVal e As System.EventArgs) Dim car = New Car car.Color = "blue" list_cars.Add(car) id_repeater_products.DataSource = list_cars id_repeater_products.DataBind() End Sub </code></pre> <p>On click event, I see now that : </p> <blockquote> <p>this is a car </p> <p>color = (m_car Is Nothing)</p> <p>this is a car </p> <p>color = (m_car Is Nothing)</p> </blockquote> <p><strong>It doesn't work, I think Container.DataItem is Nothing value, it is good instance only when loading page</strong></p> <p>I don't know how to fix it, any help ?</p>
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    1. USTheFrancisOne
    1. USTheFrancisOne
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    1. This table or related slice is empty.
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    1. CONever use `Shared` in ASP.NET if you don't want to _share_ this objects across **all** requests. Better, never use `Shared` in ASP.NET at all.
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      1. POASP vb.net : How to dynamically change list bound to repeater
      1. USTim Schmelter
    2. CO@Tim Schmelter I need to use Shared, because on click button event, my list is recreated and empty if i don't use it shared And Shared is often used, when it is good used. To not use it at all, is not understand it.
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      1. POASP vb.net : How to dynamically change list bound to repeater
      1. USTheFrancisOne
    3. COThat is because all obejcts are disposed on every page's life-cycle. But instead of making it shared you should reload it or use `ViewState/Session`.
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      1. POASP vb.net : How to dynamically change list bound to repeater
      1. USTim Schmelter
 

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