DataSource.InsertParameters.Add（“UserId”，UserGUID.ToString（））;对象引用不设置到对象错误的实例

我一直在下面的教程创建在创建用户向导在这里的附加字段：DataSource.InsertParameters.Add（“UserId”，UserGUID.ToString（））;对象引用不设置到对象错误的实例

http://www.4guysfromrolla.com/articles/070506-1.aspx#postadlink

我得到的对象引用错误没有设置为我的行上的一个对象的实例DataSource.InsertParameters.Add（“UserId”，UserGUID.ToString（））;

我的ASP代码是这样的：

<asp:CreateUserWizard ID="CreateUserWizard1" runat="server" oncreateduser="CreateUserWizard1_CreatedUser"> 
    <WizardSteps> 
     <asp:CreateUserWizardStep ID="CreateUserWizardStep1" runat="server"> 
      <ContentTemplate> 
       <table> 
        <tr> 
         <td class="text-center" colspan="2"> 
          Sign Up for Your New Account 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">User Name:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="UserName" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName" 
           ErrorMessage="User Name is required." ToolTip="User Name is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="Password" runat="server" TextMode="Password"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password" 
           ErrorMessage="Password is required." ToolTip="Password is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="ConfirmPasswordLabel" runat="server" AssociatedControlID="ConfirmPassword">Confirm Password:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="ConfirmPassword" runat="server" TextMode="Password"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="ConfirmPasswordRequired" runat="server" ControlToValidate="ConfirmPassword" 
           ErrorMessage="Confirm Password is required." ToolTip="Confirm Password is required." 
           ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
         <td class="text-center"> 
          <asp:CompareValidator ID="PasswordCompare" runat="server" ControlToCompare="Password" 
           ControlToValidate="ConfirmPassword" Display="Dynamic" ErrorMessage="The Password and Confirmation Password must match." 
           ValidationGroup="CreateUserWizard1"></asp:CompareValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="EmailLabel" runat="server" AssociatedControlID="Email">E-mail:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="Email" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="EmailRequired" runat="server" ControlToValidate="Email" 
           ErrorMessage="E-mail is required." ToolTip="E-mail is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="ManagerFirstNameLabel" runat="server" AssociatedControlID="ManagerFirstName">First Name:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="ManagerFirstName" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="ManagerFirstNameRequired" runat="server" ControlToValidate="ManagerFirstName" 
           ErrorMessage="First Name is required." ToolTip="First Name is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="ManagerSurnameLabel" runat="server" AssociatedControlID="ManagerSurname">Surname:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="ManagerSurname" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="ManagerSurnamRequired" runat="server" ControlToValidate="ManagerSurname" 
           ErrorMessage="Surname is required." ToolTip="Surname is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="TeamNameLabel" runat="server" AssociatedControlID="TeamName">Team Name:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="TeamName" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="TeamNameRequired" runat="server" ControlToValidate="TeamName" 
           ErrorMessage="Team Name is required." ToolTip="Team Name is required." ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="TeamStadiumLabel" runat="server" AssociatedControlID="TeamStadium">Team Stadium Name:</asp:Label> 
         </td> 
         <td> 
          <asp:TextBox ID="TeamStadium" runat="server"></asp:TextBox> 
          <asp:RequiredFieldValidator ID="TeamStadiumRequired" runat="server" ControlToValidate="TeamStadium" 
           ErrorMessage="Team Stadium Name is required." ToolTip="Team Stadium Name is required." 
           ValidationGroup="CreateUserWizard1">*</asp:RequiredFieldValidator> 
         </td> 
        </tr> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="RecieveReminderLabel" runat="server" AssociatedControlID="RecieveReminder">Recieve Reminder Email:</asp:Label> 
         </td> 
         <td> 
          <asp:CheckBox ID="RecieveReminder" runat="server" /> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-right"> 
          <asp:Label ID="RecieveSummaryLabel" runat="server" AssociatedControlID="RecieveSummary">Recieve Summary Email:</asp:Label> 
         </td> 
         <td> 
          <asp:CheckBox ID="RecieveSummary" runat="server" /> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-center" colspan="2" style="color: Red;"> 
          <asp:Literal ID="ErrorMessage" runat="server" EnableViewState="False"></asp:Literal> 
         </td> 
        </tr> 
        <tr> 
         <td class="text-center" colspan="2" style="color: Red;"> 
          <asp:Literal ID="Literal1" runat="server" EnableViewState="False"></asp:Literal> 
         </td> 
        </tr> 
       </table> 
      </ContentTemplate> 
     </asp:CreateUserWizardStep> 
     <asp:CompleteWizardStep ID="CompleteWizardStep1" runat="server" /> 
    </WizardSteps> 
</asp:CreateUserWizard> 

<asp:SqlDataSource ID="InsertAdditionalUserDetails" runat="server" ConnectionString="<%$ ConnectionStrings:RaiseFantasyLeagueConnectionString %>" 
    InsertCommand="INSERT INTO [UserDetails] ([UserId], [ManagerFirstName], [ManagerSurname], [TeamName], [TeamStadium], [RecieveReminder], [RecieveSummary]) VALUES (@UserId, @ManagerFirstName, @ManagerSurname, @TeamName, @TeamStadium, @RecieveReminder, @RecieveSummary)" ProviderName="System.Data.SqlClient"> 
    <InsertParameters> 
     <asp:ControlParameter Name="ManagerFirstName" Type="String" ControlID="ManagerFirstName" PropertyName="Text" /> 
     <asp:ControlParameter Name="ManagerSurname" Type="String" ControlID="ManagerSurname" PropertyName="Text" /> 
     <asp:ControlParameter Name="TeamName" Type="String" ControlID="TeamName" PropertyName="Text" /> 
     <asp:ControlParameter Name="TeamStadium" Type="String" ControlID="TeamStadium" PropertyName="Text" /> 
     <asp:ControlParameter Name= "RecieveReminder" Type="Boolean" ControlID="RecieveReminder" PropertyName="Checked" /> 
     <asp:ControlParameter Name= "RecieveSummary" Type="Boolean" ControlID="RecieveSummary" PropertyName="Checked" /> 
    </InsertParameters> 
</asp:SqlDataSource>

和C＃代码是这样

 protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e) 
    { 
     TextBox UserNameTextBox = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("UserName"); 
     SqlDataSource DataSource = (SqlDataSource)CreateUserWizardStep1.ContentTemplateContainer.FindControl("InsertAdditionalUserDetails"); 

     MembershipUser User = Membership.GetUser(UserNameTextBox.Text); 

     if (User != null) 
     { 
      object UserGUID = User.ProviderUserKey; 
      DataSource.InsertParameters.Add("UserId", UserGUID.ToString()); 
      DataSource.Insert(); 
     } 
    }

任何帮助，将不胜感激！

来源

2013-03-01 JackofAll

检查UserGUID对象 – andy 2013-03-01 12:26:51

我是相当新的asp.net和c＃。我在找什么？ – JackofAll 2013-03-01 12:27:51

您试图从“UserGUID.ToString（）”获取字符串值，您的情况可能是“UserGUID为空”。 – andy 2013-03-01 12:29:09

您的“DataSource”或“UserGUID”为NULL。

来源

2013-03-01 12:41:22 Sandeep

看来用户还没有创建。所以我无法检索ID。但是我正在使用CreatedUser事件，所以它们不应该被创建？ – JackofAll 2013-03-01 12:44:01

http://stackoverflow.com/questions/7146830/membership-getuser-provideruserkey-always-returns-null 可能是这个链接对你有帮助。 – Sandeep 2013-03-01 12:47:45

您还可以检查传递到Membership.GetUser方法的“UserNameTextBox.Text”值是否有空间。尝试通过UserNameTextBox.Text.Trim（） – Sandeep 2013-03-01 12:52:55

您收到此错误是因为您尝试将对象转换为字符串。试试这个它可以帮助你

的对象，而不是使用VAR VAR用户

来源

2013-03-01 12:42:20 kaushik

不要运气！还是一样的错误 – JackofAll 2013-03-01 12:52:04

我认为这将解决您的问题

protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e) 
{ 
    MembershipUser User = Membership.GetUser(CreateUserWizard1.UserName); 
    object userGUID = User.ProviderUserKey; 
    TextBox firstname = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("FirstName"); 
    TextBox lastname = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("LastName"); 
    TextBox companyname = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("CompanyName"); 
    TextBox address1 = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Address1"); 
    TextBox address2 = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Address2"); 
    TextBox city = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("City"); 
    DropDownList state = (DropDownList)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("State"); 
    TextBox zip = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Zip"); 
    TextBox phone_number = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Phone"); 
    TextBox email_address = (TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("Email"); 


    SqlDataSource1.InsertParameters.Add("userid", userGUID.ToString()); 
    SqlDataSource1.InsertParameters.Add("firstname", firstname.Text); 
    SqlDataSource1.InsertParameters.Add("lastname", lastname.Text); 
    SqlDataSource1.InsertParameters.Add("companyname", companyname.Text); 
    SqlDataSource1.InsertParameters.Add("address1", address1.Text); 
    SqlDataSource1.InsertParameters.Add("address2", address2.Text); 
    SqlDataSource1.InsertParameters.Add("city", city.Text); 
    SqlDataSource1.InsertParameters.Add("state", state.SelectedValue); 
    SqlDataSource1.InsertParameters.Add("zip", zip.Text); 
    SqlDataSource1.InsertParameters.Add("phone_number", phone_number.Text); 
    SqlDataSource1.InsertParameters.Add("email_address", email_address.Text); 
    SqlDataSource1.Insert(); 
}

来源

2013-03-01 20:24:42 kaushik

DataSource.InsertParameters.Add（“UserId”，UserGUID.ToString（））;对象引用不设置到对象错误的实例

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