从创建用户事件中取消创建用户向导

如果使用内容模板添加具有 ID 错误消息的文本控件，则可以显示 CreateUserWizard 控件中的错误。

<asp:Literal runat="server" EnableViewState="false" ID="ErrorMessage"></asp:Literal>

好的，找到了一个解决方法

首先，修改后的 CreatedUser 事件处理程序：

protected void RegisterUserWizard_CreatedUser(object sender, EventArgs e)
{
    try
    {
        // Try to update the customer table with the additional information
        using (OrderEntities entities = new OrderEntities())
        {
            // Read in all the values from the form
            TextBox custTitle = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerTitle");
            TextBox custName = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerName");
            TextBox custSurname = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerSurname");
            TextBox custAddress1 = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerAddressLine1");
            TextBox custAddress2 = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerAddressLine2");
            TextBox custAddress3 = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerAddressLine3");
            TextBox custCity = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerCity");
            TextBox custCounty = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerCounty");
            TextBox custPostcode = (TextBox)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerPostcode");
            DropDownList custCountry = (DropDownList)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomerCountry");
            Customer custInfo = entities.Customers.Where(c => c.UserName == RegisterUserWizard.UserName).FirstOrDefault();
            if (custInfo != null)
            {
                custInfo.Email = RegisterUserWizard.Email;
                custInfo.Password = RegisterUserWizard.Password;
                custInfo.Title = custTitle.Text;
                custInfo.Firstname = custName.Text;
                custInfo.Surname = custSurname.Text;
                custInfo.AddressLine1 = custAddress1.Text;
                custInfo.AddressLine2 = custAddress2.Text;
                custInfo.AddressLine3 = custAddress3.Text;
                custInfo.City = custCity.Text;
                custInfo.County = custCounty.Text;
                custInfo.Postcode = custPostcode.Text;
                custInfo.CountryID = custCountry.SelectedValue;
                custInfo.CreatedDate = DateTime.Now;
                entities.SaveChanges();
                FormsAuthentication.SetAuthCookie(RegisterUserWizard.UserName, false);
                // Redirect user back to calling page
                string continueUrl = RegisterUserWizard.ContinueDestinationPageUrl;
                if (String.IsNullOrEmpty(continueUrl))
                {
                    continueUrl = "~/";
                }
                Response.Redirect(continueUrl);
            }
            else
            {
                // Throw an Exception so that we redisplay CreateUserWizard showing error message
                throw new Exception("An error occurred updating account details, please try again");
            }
        }
    }
    catch (Exception ex)
    {
        // Delete the incomplete user from the membership to avoid duplicate UserName errors if the user tries again
        Membership.DeleteUser(RegisterUserWizard.UserName); 
        // Store the error message in the Context and transfer back to the page preserving the form
        Context.Items.Add("ErrorMessage", ex.Message);
        Server.Transfer(Request.Url.PathAndQuery, true);
    }
}

接下来，我向 ContentTemplate 添加了一个自定义验证器，以便我可以显示错误消息：

<asp:CustomValidator ID="CustomValidator" runat="server" ValidationGroup="RegisterUserValidationGroup" />

最后，我为 CreateatingUser 事件添加了一个新的处理程序，以从上下文中读取错误消息并使用自定义验证器显示它：

void RegisterUserWizard_CreatingUser(object sender, LoginCancelEventArgs e)
{
    // If we have received an error message in the Context then cancel the CreatingUser and display the message
    if (Context.Items["ErrorMessage"] != null)
    {
        CustomValidator custValidator = (CustomValidator)RegisterUserWizard.CreateUserStep.ContentTemplateContainer.FindControl("CustomValidator");
        custValidator.ErrorMessage = Context.Items["ErrorMessage"].ToString();
        custValidator.IsValid = false;
        e.Cancel = true;
    }
}

现在如果发生错误;我可以显示一条友好的消息，整理 MemberUser，最重要的是，用户最终不会在重试之前再次重新键入所有详细信息。