Question

我正在使用asp.net应用程序中的内置寄存器模块来注册新用户。我正在尝试为用户注册时设置角色但由于某种原因我无法访问后端代码中的文本框控件以将新用户添加到所选角色，我正在尝试使用此代码查找文本框也是，但它返回null，这意味着无法找到控件：

 TextBox txtUsername = (TextBox)Page.FindControl("UserName");
            Roles.AddUserToRole(txtUsername.Text, "User");

此外，这是注册模块的html标记：

   <asp:CreateUserWizardStep ID="RegisterUserWizardStep" runat="server">
                <ContentTemplate>
                    <h2>
                        Create a New Account
                    </h2>
                    <p>
                        Use the form below to create a new account.
                    </p>
                    <p>
                        Passwords are required to be a minimum of <%= Membership.MinRequiredPasswordLength %> characters in length.
                    </p>
                    <span class="failureNotification">
                        <asp:Literal ID="ErrorMessage" runat="server"></asp:Literal>
                    </span>
                    <asp:ValidationSummary ID="RegisterUserValidationSummary" runat="server" CssClass="failureNotification" 
                         ValidationGroup="RegisterUserValidationGroup"/>
                    <div class="accountInfo">
                        <fieldset class="register">
                            <legend>Account Information</legend>
                            <p>
                                <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">User Name:</asp:Label>
                                <asp:TextBox ID="UserName" runat="server" CssClass="textEntry"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName" 
                                     CssClass="failureNotification" ErrorMessage="User Name is required." ToolTip="User Name is required." 
                                     ValidationGroup="RegisterUserValidationGroup">*</asp:RequiredFieldValidator>
                            </p>
                            <p>
                                <asp:Label ID="EmailLabel" runat="server" AssociatedControlID="Email">E-mail:</asp:Label>
                                <asp:TextBox ID="Email" runat="server" CssClass="textEntry"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="EmailRequired" runat="server" ControlToValidate="Email" 
                                     CssClass="failureNotification" ErrorMessage="E-mail is required." ToolTip="E-mail is required." 
                                     ValidationGroup="RegisterUserValidationGroup">*</asp:RequiredFieldValidator>
                            </p>
                            <p>
                                <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                                <asp:TextBox ID="Password" runat="server" CssClass="passwordEntry" TextMode="Password"></asp:TextBox>
                                <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password" 
                                     CssClass="failureNotification" ErrorMessage="Password is required." ToolTip="Password is required." 
                                     ValidationGroup="RegisterUserValidationGroup">*</asp:RequiredFieldValidator>
                            </p>
                            <p>
                                <asp:Label ID="ConfirmPasswordLabel" runat="server" AssociatedControlID="ConfirmPassword">Confirm Password:</asp:Label>
                                <asp:TextBox ID="ConfirmPassword" runat="server" CssClass="passwordEntry" TextMode="Password"></asp:TextBox>
                                <asp:RequiredFieldValidator ControlToValidate="ConfirmPassword" CssClass="failureNotification" Display="Dynamic" 
                                     ErrorMessage="Confirm Password is required." ID="ConfirmPasswordRequired" runat="server" 
                                     ToolTip="Confirm Password is required." ValidationGroup="RegisterUserValidationGroup">*</asp:RequiredFieldValidator>
                                <asp:CompareValidator ID="PasswordCompare" runat="server" ControlToCompare="Password" ControlToValidate="ConfirmPassword" 
                                     CssClass="failureNotification" Display="Dynamic" ErrorMessage="The Password and Confirmation Password must match."
                                     ValidationGroup="RegisterUserValidationGroup">*</asp:CompareValidator>
                            </p>
                        </fieldset>
                        <p class="submitButton">
                            <asp:Button ID="CreateUserButton" runat="server" CommandName="MoveNext" Text="Create User" 
                                 ValidationGroup="RegisterUserValidationGroup"/>
                        </p>
                    </div>
                </ContentTemplate>
                <CustomNavigationTemplate>
                </CustomNavigationTemplate>
            </asp:CreateUserWizardStep>

知道我做错了什么吗？谢谢，Laziale

Answer 1

这是因为您的UserName文本框不是该页面的直接子项。它嵌套在许多控件中。以下是递归方式，您可以搜索页面中的所有控件以获取UserName文本框的实例：

private TextBox getUserNameTextBox(ControlCollection ctls)
    {
        foreach (Control c in ctls)
        {
            if (c is System.Web.UI.WebControls.TextBox)
            {
                if (c.ID == "UserName")
                    return c;
            }
            if (c.HasControls())
            {
                getAllCtl(c.Controls);


            }
        }
        return null;
    }

YourUserNameTextBox = getuserNameTextBox(Page.Controls);

注册时将用户添加到角色

1 个答案: