当我点击CreateUserWizard控件的“下一步”按钮时出现错误 - “对象引用没有设置为对象的实例”。我检查了我的代码，我没有留下任何变量null。但是我仍然无法解决这个错误。
Source Error:
Line 29: object UserGUID = User.ProviderUserKey;
Line 30:
Line 31: DataSource.InsertParameters.Add("UserId", UserGUID.ToString()); //this is the line that caused the error
Line 32:
Line 33: DataSource.Insert();
This is my html code file:
<form id="form1" runat="server">
<div>
<asp:CreateUserWizard ID="CreateUserWizard1" runat="server"
OnCreatedUser="CreateUserWizard1_CreatedUser" CreateUserButtonText="Next"
FinishCompleteButtonText="Create User" Height="330px"
Width="512px">
<WizardSteps>
<asp:CreateUserWizardStep ID="CreateUserWizardStep2" runat="server" >
<ContentTemplate>
<table>
<tr>
<th>User Information</th>
</tr>
<tr>
<td>Username:</td>
<td class="style2">
<asp:TextBox runat="server" ID="UserName" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator9" ControlToValidate="UserName"
ErrorMessage="Username is required." />
</td>
</tr>
<tr>
<td>Password:</td>
<td class="style2">
<asp:TextBox runat="server" ID="Password" TextMode="Password" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator10" ControlToValidate="Password"
ErrorMessage="Password is required." />
</td>
</tr>
<tr>
<td>Confirm Password:</td>
<td class="style2">
<asp:TextBox runat="server" ID="ConfirmPassword" TextMode="Password" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator13" ControlToValidate="ConfirmPassword"
ErrorMessage="Confirm Password is required." />
</td>
</tr>
<tr>
<td>
Email:</td>
<td class="style2">
<asp:TextBox runat="server" ID="Email" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator16" runat="server" ControlToValidate="Email"
ErrorMessage="Email required."></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>Question:</td>
<td class="style2">
<asp:TextBox runat="server" ID="Question" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator12" ControlToValidate="Question"
ErrorMessage="Question is required." />
</td>
</tr>
<tr>
<td>Answer:</td>
<td class="style2">
<asp:TextBox runat="server" ID="Answer" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator14" ControlToValidate="Answer"
ErrorMessage="Answer is required." />
</td>
</tr>
<tr>
<td colspan="2">
<asp:CompareValidator ID="PasswordCompare" runat="server" ControlToCompare="Password"
ControlToValidate="ConfirmPassword" Display="Dynamic" ErrorMessage="The Password and Confirmation Password must match."></asp:CompareValidator>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Literal ID="ErrorMessage" runat="server" EnableViewState="False"></asp:Literal>
</td>
</tr>
</table>
</ContentTemplate>
</asp:CreateUserWizardStep>
<asp:WizardStep ID="CreateUserWizardStep0" runat="server" Title="User Details">
<table>
<tr>
<th>Billing Information</th>
</tr>
<tr>
<td>Name:</td>
<td class="style1">
<asp:TextBox runat="server" ID="CustName" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator18" ControlToValidate="CustName"
ErrorMessage="Name is required." />
</td>
</tr>
<tr>
<td>Contact Number:</td>
<td class="style1">
<asp:TextBox runat="server" ID="CustNum" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator19" ControlToValidate="CustNum"
ErrorMessage="Contact num is required." />
</td>
</tr>
<tr>
<td>Role:</td>
<td class="style1">
<asp:DropDownList ID="CustRole" runat="server" AutoPostBack="True" Height="16px"
Width="123px">
<asp:ListItem></asp:ListItem>
<asp:ListItem>Bride</asp:ListItem>
<asp:ListItem>Groom</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator20" ControlToValidate="CustRole"
ErrorMessage="Role is required." />
</td>
</tr>
<tr>
<td>
Status:</td>
<td class="style1">
<asp:DropDownList ID="CustStatus" runat="server" AutoPostBack="True"
Height="17px" Width="121px">
<asp:ListItem></asp:ListItem>
<asp:ListItem>Status A</asp:ListItem>
<asp:ListItem>Status B</asp:ListItem>
<asp:ListItem>Status C</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator15" runat="server" ControlToValidate="CustStatus"
ErrorMessage="Status is required."/>
</td>
</tr>
<tr>
<td>
</td>
<td class="style1">
</td>
</tr>
<tr>
<td>
Partner's Name:</td>
<td class="style1">
<asp:TextBox runat="server" ID="PName" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator5" ControlToValidate="PName"
ErrorMessage="PName is required." />
</td>
</tr>
<tr>
<td>
Partner Email:</td>
<td class="style1">
<asp:TextBox runat="server" ID="PEmail" />
</td>
</tr>
<tr>
<td>
PRole:
</td>
<td class="style1">
<asp:DropDownList ID="PRole" runat="server" AutoPostBack="True" Height="16px"
Width="123px">
<asp:ListItem></asp:ListItem>
<asp:ListItem>Bride</asp:ListItem>
<asp:ListItem>Groom</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator7" ControlToValidate="PRole"
ErrorMessage="PRole is required." />
</td>
</tr>
<tr>
<td>
Wed Date:
</td>
<td class="style1">
<cc1:DatePicker ID="WedDate" runat="server" CalendarDate=""
TextCssClass="" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator17" runat="server" ControlToValidate="WedDate"
ErrorMessage="Wedding date required"/>
</td>
</tr>
</table>
</asp:WizardStep>
<asp:CompleteWizardStep ID="CompleteWizardStep1" runat="server">
<ContentTemplate>
<table>
<tr>
<td align="center" colspan="2">
Complete</td>
</tr>
<tr>
<td>
Your account has been successfully created.</td>
</tr>
<tr>
<td align="right" colspan="2">
<asp:Button ID="ContinueButton" runat="server" CausesValidation="False"
CommandName="Continue" Text="Continue" ValidationGroup="CreateUserWizard1" />
</td>
</tr>
</table>
<asp:SqlDataSource ID="InsertExtraInfo" runat="server" ConnectionString="<%$ ConnectionStrings:ASPNETDBConnectionString1 %>"
InsertCommand="INSERT INTO [UserDetails] ([UserId], [CustName], [CustNum], [CustRole], [CustStatus], [PName], [PEmail], [PRole], [WedDate]) VALUES (@UserId, @CustName, @CustNum, @CustRole, @CustStatus, @PName, @PEmail, @PRole, @WedDate)"
ProviderName="<%$ ConnectionStrings:ASPNETDBConnectionString1.ProviderName %>">
<InsertParameters>
<asp:ControlParameter Name="CustName" Type="String" ControlID="CustName" PropertyName="Text" />
<asp:ControlParameter Name="CustNum" Type="String" ControlID="CustNum" PropertyName="Text" />
<asp:ControlParameter Name="CustRole" Type="String" ControlID="CustRole" PropertyName="Text" />
<asp:ControlParameter Name="CustStatus" Type="String" ControlID="CustStatus" PropertyName="Text" />
<asp:ControlParameter Name="PName" Type="String" ControlID="PName" PropertyName="Text" />
<asp:ControlParameter Name="PEmail" Type="String" ControlID="PEmail" PropertyName="Text" />
<asp:ControlParameter Name="PRole" Type="String" ControlID="PRole" PropertyName="Text" />
<asp:ControlParameter Name="WedDate" Type="String" ControlID="WedDate" PropertyName="Text" />
</InsertParameters>
</asp:SqlDataSource>
</ContentTemplate>
</asp:CompleteWizardStep>
</WizardSteps>
</asp:CreateUserWizard>
<br />
</div>
This is the code behind:
using System;
using System.Data;
using System.Configuration;
using System.Web.Security;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Register : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
{
TextBox UserName=
(TextBox)CreateUserWizardStep2.ContentTemplateContainer.FindControl("UserName");
SqlDataSource DataSource =
(SqlDataSource)CreateUserWizardStep2.ContentTemplateContainer.FindControl("InsertExtraInfo");
MembershipUser User = Membership.GetUser(UserName.Text);
object UserGUID = User.ProviderUserKey;
DataSource.InsertParameters.Add("UserId", UserGUID.ToString()); //the error lies at here
DataSource.Insert();
}
}
答案 0 :(得分：1)
我查看了我的代码，我没有离开我的任何一个 变量null。但我仍然无法解决这个错误。
您尚未检查所有变量，否则不会发生此错误。
您是否检查过您的DataSource以确保找到SqlDataSource？ DataSource的InsertParameters属性确保它不为null？ UserGUID确保它不为空？