无法读取文本框ID名称 [英] unable to read textbox id name

问题描述

你好，

我的代码背后代码无法读取aspz页面上的文本框ID名称(错误-名称"txtPWD"在当前上下文中不存在):

 <   asp:UpdatePanel     ID   ="   ="span>    runat   =" 服务器" <   ContentTemplate  > 
            <   asp:Button     ID   ="   runat   服务器" 文本  登录" 
 
                                  onclick    btnLgin_Click" / > 
            <   asp:Panel     ID   ="   runat   服务器" 样式  显示:无；" <   asp:登录    ID   ="   runat   服务器"  RememberMeText   记住我."  BackColor   ="  > 
                    <   LayoutTemplate  > 
                        <  表    ="    边框  ="     cellpadding   ="  1" 单元格间距  ="  > 
                            <  正文 > 
                                <   tr  > 
                                    <   td  > 
                                        <  表    ="   0"  cellpadding   > 0"  > 
                                            <  正文 > 
                                                <   tr  > 
                                                    <   td     ="   2"  align    center" > 
                                                        您尚未登录.<  /td  > 
                                                <  /tr  > 
                                                <   tr  > 
                                                    <   td     ="  右" <   asp:Label     ID   ="   runat   服务器"  AssociatedControlID   用户名" "><  /asp:标签 > 
                                                    <  /td  > 
                                                    <   td  > 
                                                        <   asp:TextBox     ID   ="   runat   服务器" <  > 
                                                        <   asp:RequiredFieldValidator     ID   ="   runat   服务器"  ControlToValidate   用户名 
 
                                                                                                        ErrorMessage   ="    工具提示  ="     ValidationGroup   ="  ctl07 $ Login1" <  /asp:RequiredFieldValidator  > 
                                                    <  /td  > 
                                                <  /tr  > 
                                                <   tr  > 
                                                    <   td     ="  右" <   asp:Label     ID   ="   runat   服务器"  AssociatedControlID   密码" "><  /asp:标签 > 
                                                    <  /td  > 
                                                    <   td  > 
                                                        <   asp:TextBox     ID   ="   runat   服务器"  TextMode   密码" <  /asp:TextBox  > 
                                                        <   asp:RequiredFieldValidator     ID   ="   runat   服务器"  ControlToValidate   密码" 
                                                                                                        ErrorMessage   ="    工具提示  ="     ValidationGroup   ="  >  * <  /asp:RequiredFieldValidator  > 
                                                    <  /td  > 
                                                <  /tr  > 
                                                <   tr  >  

背后的代码:

 SqlConnection con = 新 SqlConnection(ConfigurationManager.ConnectionStrings ["  dbconnection"].ConnectionString)；
        con.Open();
        SqlCommand cmd = 新 SqlCommand(" ，同上)；
        cmd.Parameters.AddWithValue(" ，txtUserName.Text);
        cmd.Parameters.AddWithValue(" ，txtPWD.Text); 

非常感谢

解决方案

Login1" < > < /td > < /tr > < tr > < td =" 右" < asp:Label ID =" runat 服务器" AssociatedControlID 密码" ">< /asp:标签 > < /td > < td > < asp:TextBox ID =" runat 服务器" TextMode 密码" < /asp:TextBox > < asp:RequiredFieldValidator ID =" runat 服务器" ControlToValidate 密码" ErrorMessage =" 工具提示 =" ValidationGroup =" > * < /asp:RequiredFieldValidator > < /td > < /tr > < tr >

背后的代码:

 SqlConnection con = 新 SqlConnection(ConfigurationManager.ConnectionStrings ["  dbconnection"].ConnectionString)；
        con.Open();
        SqlCommand cmd = 新 SqlCommand(" ，同上)；
        cmd.Parameters.AddWithValue(" ，txtUserName.Text);
        cmd.Parameters.AddWithValue(" ，txtPWD.Text); 

非常感谢

更新您的Web表单designer.aspx.cs文件.

如何更新designer.aspx.cs:

1.从页面上删除(剪切)控件.
2.再次将其粘贴到相同位置.
3.检查designer.cs文件，其中已创建实例，例如:

 ///  <  摘要 > 
 ///  txtPWD控件.
 ///  <  /summary  > 
 ///  <  备注 > 
 /// 自动生成的字段.
 /// 修改从设计器文件到代码隐藏文件的移动字段声明.
 ///  <  /注释 > 
 受保护的 全局 :: System.Web.UI.WebControls.TextBox txtPWD;  

hello,

My code behind code is unable to read textbox ids name on the aspz page (error - The name ''txtPWD'' does not exist in the current context):

<asp:UpdatePanel ID="TestLogin" runat="server">
        <ContentTemplate>
            <asp:Button ID="btnLogin" runat="server" Text="Login" 

                onclick="btnLgin_Click" />
            <asp:Panel ID="LoginPopup" runat="server" Style="display: none;">
                <asp:Login ID="Login2" runat="server" RememberMeText="Remember me." BackColor="White">
                    <LayoutTemplate>
                        <table style="border-collapse: collapse;" border="0" cellpadding="1" cellspacing="0">
                            <tbody>
                                <tr>
                                    <td>
                                        <table border="0" cellpadding="0">
                                            <tbody>
                                                <tr>
                                                    <td colspan="2" align="center">
                                                        You are not logged in.</td>
                                                </tr>
                                                <tr>
                                                    <td align="right">
                                                        <asp:Label ID="UserNameLabel" runat="server" AssociatedControlID="UserName">UserName:</asp:Label>
                                                    </td>
                                                    <td>
                                                        <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
                                                        <asp:RequiredFieldValidator ID="UserNameRequired" runat="server" ControlToValidate="UserName"

                                                            ErrorMessage="User Name is required." ToolTip="User Name is required." ValidationGroup="ctl07$Login1">*</asp:RequiredFieldValidator>
                                                    </td>
                                                </tr>
                                                <tr>
                                                    <td align="right">
                                                        <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label>
                                                    </td>
                                                    <td>
                                                        <asp:TextBox ID="txtPWD" runat="server" TextMode="Password"></asp:TextBox>
                                                        <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password"

                                                            ErrorMessage="Password is required." ToolTip="Password is required." ValidationGroup="ctl07$Login1">*</asp:RequiredFieldValidator>
                                                    </td>
                                                </tr>
                                                <tr>

code behind:

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from UserInformation where UserName =@username and Password=@password", con);
        cmd.Parameters.AddWithValue("@username", txtUserName.Text);
        cmd.Parameters.AddWithValue("@password", txtPWD.Text);

Many thanks

解决方案

Login1">*</asp:RequiredFieldValidator> </td> </tr> <tr> <td align="right"> <asp:Label ID="PasswordLabel" runat="server" AssociatedControlID="Password">Password:</asp:Label> </td> <td> <asp:TextBox ID="txtPWD" runat="server" TextMode="Password"></asp:TextBox> <asp:RequiredFieldValidator ID="PasswordRequired" runat="server" ControlToValidate="Password" ErrorMessage="Password is required." ToolTip="Password is required." ValidationGroup="ctl07

Login1">*</asp:RequiredFieldValidator> </td> </tr> <tr>

code behind:

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString);
        con.Open();
        SqlCommand cmd = new SqlCommand("select * from UserInformation where UserName =@username and Password=@password", con);
        cmd.Parameters.AddWithValue("@username", txtUserName.Text);
        cmd.Parameters.AddWithValue("@password", txtPWD.Text);

Many thanks

Update your web form designer.aspx.cs file.

How can you update designer.aspx.cs:

1. Remove (Cut) control from page.
2. Paste it again on same position.
3. check designer.cs file where instance has been created like:

/// <summary>
        /// txtPWD control.
        /// </summary>
        /// <remarks>
        /// Auto-generated field.
        /// To modify move field declaration from designer file to code-behind file.
        /// </remarks>
        protected global::System.Web.UI.WebControls.TextBox txtPWD;

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