sm15455 ha scritto:
se usi un objectdatasource e lo colleghi alla classe membership hai risolto il tuo problema.
Ok, ho fatto come hai detto e sono riuscito a visualizzare tutti gli utenti nella gridview. Ho provato anche a inserire i pulsanti di editing e, ovviamente, a impostare la funzione di delete nel controllo objectdatasource ma nel momento in cui provo a cancellare un utente ottengo il seguente messaggio di errore:
<b>No parameterless constructor defined for this object.</b>
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.
Stack Trace:
[MissingMethodException: No parameterless constructor defined for this object.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +103
System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +261
System.Activator.CreateInstance(Type type, Boolean nonPublic) +66
System.Activator.CreateInstance(Type type) +6
System.Web.UI.WebControls.ObjectDataSourceView.BuildDataObject(Type dataObjectType, IDictionary inputParameters) +102
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteDelete(IDictionary keys, IDictionary oldValues) +655
System.Web.UI.DataSourceView.Delete(IDictionary keys, IDictionary oldValues, DataSourceViewOperationCallback callback) +176
System.Web.UI.WebControls.GridView.HandleDelete(GridViewRow row, Int32 rowIndex) +914
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +1067
System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument) +215
System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +31
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +32
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +244
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3840
Posto anche il codice asp della pagina:
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false"
CodeFile="UserManager.aspx.vb" Inherits="Default2" Title="Untitled Page" MaintainScrollPositionOnPostback="true" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:GridView ID="gvUsers" runat="server" Width="100%" CellPadding="4" ForeColor="#333333"
GridLines="None" DataSourceID="ObjectDataSource1" AutoGenerateColumns="False"
AllowPaging="True" DataKeyNames="UserName" Font-Names="Verdana" Font-Size="8pt">
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#EFF3FB" />
<EditRowStyle BackColor="#2461BF" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:BoundField DataField="UserName" HeaderText="UserName" ReadOnly="True" SortExpression="UserName" />
<asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" />
<asp:BoundField DataField="CreationDate" HeaderText="CreationDate" ReadOnly="True"
SortExpression="CreationDate" />
<asp:BoundField DataField="LastActivityDate" HeaderText="LastActivityDate" SortExpression="LastActivityDate" />
<asp:CheckBoxField DataField="IsOnline" HeaderText="IsOnline" ReadOnly="True" SortExpression="IsOnline" />
<asp:CheckBoxField DataField="IsApproved" HeaderText="IsApproved" SortExpression="IsApproved" />
<asp:CheckBoxField DataField="IsLockedOut" HeaderText="IsLockedOut" ReadOnly="True"
SortExpression="IsLockedOut" />
<asp:BoundField DataField="Comment" HeaderText="Comment" SortExpression="Comment" />
<asp:CommandField ShowSelectButton="True" />
<asp:CommandField ShowDeleteButton="True" />
<asp:CommandField ShowEditButton="True" />
</Columns>
</asp:GridView>
<asp:ObjectDataSource ID="ObjectDataSource1" runat="server" TypeName="System.Web.Security.Membership"
SelectMethod="GetAllUsers" DeleteMethod="DeleteUser" DataObjectTypeName="System.Web.Security.MembershipUser" OldValuesParameterFormatString="original_{0}" UpdateMethod="UpdateUser">
<DeleteParameters>
<asp:ControlParameter ControlID="gvUsers" Name="username" PropertyName="SelectedValue"
Type="String" />
</DeleteParameters>
</asp:ObjectDataSource>
</asp:Content>Che cosa genera questo errore e come faccio a risolverlo?
Grazie ancora, ciao.
