使用CreateUserWizard时，对象引用未设置为对象错误的实例

当我点击CreateUserWizard控件的“下一步”按钮时出现错误 – “对象引用未设置为对象的实例”。我检查了我的代码，我没有留下任何变量null。但我仍然可以解决这个错误。

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: 
 
     
 
 
User Information
 
 
 
Username:
 
   
 
 
 
Password:
 
   
 
 
 
Confirm Password:
 
   
 
 
 
 Email:
 
   
 
 
 
Question:
 
   
 
 
 
Answer:
 
   
 
 
 
  
 
 
 
  
 
 
    
 
 
Billing Information
 
 
 
Name:
 
   
 
 
 
Contact Number:
 
   
 
 
 
Role:
 
   Bride Groom   
 
 
 
 Status:
 
   Status A Status B Status C   
 
 
 
  
 
  
 
 
 
 Partner's Name:
 
   
 
 
 
 Partner Email:
 
  
 
 
 
 PRole: 
 
   Bride Groom   
 
 
 
 Wed Date: 
 
   
 
 
    
 
 
 Complete
 
 
 
 Your account has been successfully created.
 
 
 
  
 
 
 <asp:SqlDataSource ID="InsertExtraInfo" runat="server" ConnectionString="" InsertCommand="INSERT INTO [UserDetails] ([UserId], [CustName], [CustNum], [CustRole], [CustStatus], [PName], [PEmail], [PRole], [WedDate]) VALUES (@UserId, @CustName, @CustNum, @CustRole, @CustStatus, @PName, @PEmail, @PRole, @WedDate)" ProviderName="">                
 
 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(); } } 

Answer 1

我查看了我的代码，我没有留下任何变量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？