ASP.NET无法创建匿名用户求助：aspnet_Users表IsAnonymous始终为False

问题描述 #

尝试让通过CreateUserWizard创建的新用户直接成为匿名用户（跳过登录流程），但aspnet_Users表中新建用户的IsAnonymous字段始终为false。已开启<anonymousIdentification enabled="true"/>、设置authentication mode="Forms"，但均未生效。

失败原因 #

1. 概念混淆：ASP.NET的匿名用户是系统为未登录访客自动生成的临时身份，而CreateUserWizard创建的是正式会员用户，两者属于完全独立的身份体系。SqlMembershipProvider创建正式用户时，默认会将IsAnonymous设为false，这是硬编码的默认行为，和匿名身份识别配置无关。
2. CreateUserWizard默认行为：该控件默认会在用户创建完成后自动登录新用户，直接覆盖匿名身份状态，即使开启匿名识别也无法生效。
3. 配置方向错误：<anonymousIdentification enabled="true"/>的作用是允许系统为未登录用户生成匿名身份标识，并非将正式创建的会员用户转为匿名用户。

解决指导 #

需求1：创建用户后不自动登录，保持匿名状态 #

在CreateUserWizard控件中添加LoginCreatedUser="false"属性，禁用自动登录行为：

<asp:CreateUserWizard ID="CreateUserWizard1" runat="server"    
     OnCreatedUser="CreateUserWizard1_CreatedUser"
     LoginCreatedUser="false">
    <!-- 原有步骤内容不变 -->
</asp:CreateUserWizard>

此时用户创建账号后不会自动登录，系统会继续使用之前的匿名身份（如果存在），但新建会员用户的IsAnonymous字段仍会是false——这是正常的，因为它属于正式会员账号，而非匿名用户。

需求2：强制将新建用户的IsAnonymous设为true（不推荐） #

如果确实需要修改该字段，只能在用户创建完成后手动执行数据库更新，比如在CreateUserWizard1_CreatedUser事件中添加逻辑：

protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e)
{
    string username = CreateUserWizard1.UserName;
    MembershipUser user = Membership.GetUser(username);
    
    using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString))
    {
        string sql = "UPDATE aspnet_Users SET IsAnonymous = 1 WHERE UserId = @UserId";
        SqlCommand cmd = new SqlCommand(sql, conn);
        cmd.Parameters.AddWithValue("@UserId", (Guid)user.ProviderUserKey);
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();
    }
}

⚠️ 注意：这种操作违背ASP.NET会员系统的设计逻辑，可能导致后续身份验证、权限控制出现异常，不建议使用。

需求3：让未登录用户使用功能（无需创建正式账号） #

直接依赖ASP.NET的匿名身份识别即可，无需创建会员账号。开启<anonymousIdentification enabled="true"/>后，系统会自动为每个未登录访客生成唯一的匿名标识，可通过Request.AnonymousID获取，用于保存用户临时数据。

相关代码 #

ASPX页面代码 #

<asp:CreateUserWizard ID="CreateUserWizard1" runat="server"    
     OnCreatedUser="CreateUserWizard1_CreatedUser">
    <WizardSteps>
        <asp:CreateUserWizardStep ID="CreateUserWizardStep1" runat="server">
            <ContentTemplate>
                <table>
                    <tr>
                        <td align="center" colspan="2">Sign Up for Your New Account</td>
                    </tr>
                    <tr>
                        <td align="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 align="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 align="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>
                    </tr>
                    <tr>
                        <td align="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 align="right">
                            <asp:Label ID="QuestionLabel" runat="server" 
AssociatedControlID="Question">Security Question:</asp:Label>
                        </td>
                        <td>
                            <asp:TextBox ID="Question" runat="server">
</asp:TextBox>
                            <asp:RequiredFieldValidator ID="QuestionRequired" 
runat="server" ControlToValidate="Question" ErrorMessage="Security question is required." 
ToolTip="Security question is required." ValidationGroup="CreateUserWizard1">*
</asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td align="right">
                            <asp:Label ID="AnswerLabel" runat="server" 
AssociatedControlID="Answer">Security Answer:</asp:Label>
                        </td>
                        <td>
                            <asp:TextBox ID="Answer" runat="server"></asp:TextBox>
                            <asp:RequiredFieldValidator ID="AnswerRequired" 
runat="server" ControlToValidate="Answer" ErrorMessage="Security answer is required." 
ToolTip="Security answer is required." ValidationGroup="CreateUserWizard1">*
</asp:RequiredFieldValidator>
                        </td>
                    </tr>
                    <tr>
                        <td align="center" colspan="2">
                            <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 align="center" colspan="2" style="color:Red;">
                            <asp:Literal ID="ErrorMessage" runat="server" 
EnableViewState="False"></asp:Literal>
                        </td>
                    </tr>
                </table>
            </ContentTemplate>
        </asp:CreateUserWizardStep>
         <asp:WizardStep runat="server">
            <table>
                <tr>
                    <td align="center" colspan="2" class="auto-style1">These are 
Custom Fields</td>
                </tr>
                <tr>
                    <td align="right">
                        <asp:Label ID="Label1" runat="server" 
AssociatedControlID="Firstname">First name:</asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="Firstname" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td align="right">
                        <asp:Label ID="Label2" runat="server" 
AssociatedControlID="Lastname">Last name:</asp:Label>
                    </td>
                    <td>
                        <asp:TextBox ID="Lastname" runat="server"></asp:TextBox>
                    </td>
                </tr>
            </table>
        </asp:WizardStep>
        <asp:CompleteWizardStep ID="CompleteWizardStep1" runat="server">
            
        </asp:CompleteWizardStep>
    </WizardSteps>
</asp:CreateUserWizard>

Web.Config配置代码 #

<anonymousIdentification enabled="true"/>
<authentication mode="Forms">
  <forms name="SignalRChat" protection="All" path="/" timeout="60"/>
</authentication>
<connectionStrings>
  <add name="myConnectionString" connectionString="Data Source=DESKTOP-3GI4IDE;Initial     
Catalog=aspnetdb;User ID=sa;Password=********"
    providerName="System.Data.SqlClient" />
</connectionStrings>
<membership defaultProvider="MySqlLoginProvider">
  <providers>
    <add name="MySqlLoginProvider" type="System.Web.Security.SqlMembershipProvider"     
connectionStringName="myConnectionString" applicationName="VijayApp"/>
  </providers>
</membership>

内容的提问来源于stack exchange，提问作者Khushboo Tripathi