获取名称而不是ID号

Question

我有一个问题，因为我创建了三个级联dropdownlist，显示国家和州以及城市，但是我想保存dropdownlist显示的内容，如果点击下面的内容可以获得更多信息链接，因为我有记录与我发生了什么。感谢您的全力支持。

https://www.youtube.com/watch?v=PAx3cvHqKf0&feature=youtu.be

ASP.NET标记

<div class="banner728"> 
    <asp:Image ID="Image1" runat="server" 
     ImageUrl="~/images/general/bann72890.png" /> 
</div> 
<div class="space"> 
</div> 
<div class="style6"> 
    <strong style="font-size: medium">Registre New User</strong></div> 
<br /> 
<br /> 
<br /> 
<br /> 
<table style="width: 69%; height: 338px;" align="center"> 


    <tr> 

    <td class="style5"> &nbsp; Användarnamn</td> 
    <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="UsrNme" runat="server" Width="258px" Height="20px"></asp:TextBox> 
     </td> 
    <td> 
     <asp:RequiredFieldValidator ID="Userreqlbl" runat="server" 
      ControlToValidate="UsrNme" ErrorMessage="This field is required" ForeColor="Red"></asp:RequiredFieldValidator><br /> 
     <br /> 
     </td> 


    </tr> 


    <tr> 
     <td class="style5"> 
      &nbsp; Förnamn 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="fnbox" runat="server" Height="20px" Width="258px" 
       ></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      &nbsp; 
     </td> 
    </tr> 

    <tr> 
     <td class="style5"> 
      &nbsp; Efternamn 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="lnamebox" runat="server" Height="20px" Width="258px"></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      &nbsp; 
     </td> 
    </tr> 

    <tr> 
     <td class="style5"> 
      &nbsp; Lösenord 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="passtxtbx1" runat="server" TextMode="Password" Width="258px" Height="20px"></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="passtxtbx1" 
       ErrorMessage="This part is required" ForeColor="Red"></asp:RequiredFieldValidator> 
     </td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; Återskrivnings Lösenord 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="passtxtbx2" runat="server" TextMode="Password" Width="258px" Height="20px"></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      <asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="passtxtbx1" 
       ControlToValidate="passtxtbx2" ErrorMessage="The password is not match" ForeColor="Red"></asp:CompareValidator> 
     </td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; E-post 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="emailbox" runat="server" Height="20px" Width="258px"></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="emailbox" 
       ErrorMessage="Invalid Format" ForeColor="Red" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator> 
      &nbsp; 
     </td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; Land 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:DropDownList ID="countrdrdolst" runat="server" AutoPostBack="True" 
       onselectedindexchanged="countrdrdolst_SelectedIndexChanged"> 
      </asp:DropDownList> 
     </td> 
     <td style="text-align: left"> 
      &nbsp;</td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; Län 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:DropDownList ID="statedrdolst" runat="server" AutoPostBack="True" 
       onselectedindexchanged="statedrdolst_SelectedIndexChanged"> 
      </asp:DropDownList> 
     </td> 
     <td style="text-align: left"> 
      &nbsp;</td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; Stad 
     </td> 
     <td style="text-align: left" class="style11"> 
      <asp:DropDownList ID="citiesdrdolst" runat="server" AutoPostBack="True" 
       onselectedindexchanged="citiesdrdolst_SelectedIndexChanged"> 
      </asp:DropDownList> 
     </td> 
     <td style="text-align: left" class="style12"> 
     </td> 
    </tr> 


    <tr> 
     <td class="style5"> 
      &nbsp; Postnummer 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:TextBox ID="postbox" runat="server" Width="258px" 
       Height="20px"></asp:TextBox> 
     </td> 
     <td style="text-align: left"> 
      &nbsp; 
     </td> 
    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; Personlig bild 
     </td> 
     <td style="text-align: left" class="style8"> 
      <asp:FileUpload ID="FileUpload1" runat="server" /> 
     </td> 
     <td style="text-align: left"> 
      &nbsp; 
     </td> 
    </tr> 
    <tr> 
    <td> 


    </tr> 
    <tr> 
     <td class="style5"> 
      &nbsp; 
      </td> 
     <td class="style8"> 







      <asp:Button ID="btnSave" runat="server" onclick="btnSave_Click" Text="Create" CausesValidation="True"/> 







     </td> 
     <td> 
      &nbsp;</td> 
    </tr> 
</table> 
<br /> 
<br /> 
<br /> 
</ContentTemplate> 
</asp:UpdatePanel> 

C＃代码

public partial class Registration : System.Web.UI.Page 
{ 


    string sc = ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString.ToString(); 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!Page.IsPostBack) 
     { 
      DataTable countrycascd = new DataTable(); 
      using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString)) 
      { 
       SqlDataAdapter adaptar = new SqlDataAdapter("select [countryID],[country] FROM [countr]", con); 
       adaptar.Fill(countrycascd); 

       countrdrdolst.DataSource = countrycascd; 
       countrdrdolst.DataTextField = "country"; 
       countrdrdolst.DataValueField = "countryID"; 
       countrdrdolst.DataBind(); 
      } 

      countrdrdolst.Items.Insert(0, new ListItem("Select country", "0")); 
     } 
    } 





    protected void btnSave_Click(object sender, EventArgs e) 
    { 



     SqlConnection cn = new SqlConnection(sc); 
     SqlCommand cmd = new SqlCommand(); 

     string sqlstatment = "INSERT INTO UserInfo (UID, FN, LN, Password, RePass, Email,CountID, State,City, Post, Img) VALUES (@UID,@FN,@LN,@Password,@RePass,@Email,@CountID,@State,@City,@Post,@Img)"; 

     cmd.Connection = cn; 
     cmd.CommandType = CommandType.Text; 
     cmd.CommandText = sqlstatment; 

     //Insert the parameters first 
     cmd.Parameters.AddWithValue("@UID", UsrNme.Text); 
     cmd.Parameters.AddWithValue("@FN", fnbox.Text); 
     cmd.Parameters.AddWithValue("@LN", lnamebox.Text); 
     cmd.Parameters.AddWithValue("@Password", passtxtbx1.Text); 
     cmd.Parameters.AddWithValue("@RePass", passtxtbx2.Text); 
     cmd.Parameters.AddWithValue("@Email", emailbox.Text); 
     cmd.Parameters.AddWithValue("@CountID", countrdrdolst.Text); 
     cmd.Parameters.AddWithValue("@State", statedrdolst.Text); 
     cmd.Parameters.AddWithValue("@City", citiesdrdolst.Text); 
     cmd.Parameters.AddWithValue("@Post", postbox.Text); 

     //Check if there's a file or not 
     if (FileUpload1.HasFile && FileUpload1.PostedFile.ContentLength > 0) 
     { 
      FileUpload1.SaveAs(Server.MapPath("~/images/users/" + FileUpload1.FileName)); 
      cmd.Parameters.AddWithValue("@Img", FileUpload1.FileName); 
     } 
     else 
     { 
      //Must add the paramater value to any value or DBNull.Value 
      cmd.Parameters.AddWithValue("@Img", ""); 
     } 




     //Open the connection and execute the command 
     cn.Open(); 
     cmd.ExecuteNonQuery(); 
     //Close the connection 
     cn.Close(); 
     Response.Redirect("User panel.aspx"); 


     } 

    protected void countrdrdolst_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     int countryID = Convert.ToInt32(countrdrdolst.SelectedValue); 
     DataTable StateDT = new DataTable(); 
     using (SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString)) 
     { 
      SqlDataAdapter adaptar = new SqlDataAdapter("Select [StateID],[State] FROM [State] WHERE [countryID] = " + countryID, con2); 

      adaptar.Fill(StateDT); 

      statedrdolst.DataSource = StateDT; 
      statedrdolst.DataTextField = "State"; 
      statedrdolst.DataValueField = "StateID"; 
      statedrdolst.DataBind(); 
     } 

     statedrdolst.Items.Insert(0, new ListItem("Select State", "0")); 


    } 

    protected void statedrdolst_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     int StateID = Convert.ToInt32(statedrdolst.SelectedValue); 
     DataTable Citydt = new DataTable(); 
     using (SqlConnection con3 = new SqlConnection(ConfigurationManager.ConnectionStrings["BeravaConnectionString"].ConnectionString)) 
     { 
      SqlDataAdapter adaptar = new SqlDataAdapter("select [CityID],[City] FROM [Cities] WHERE [StateID] = " + StateID, con3); 
      adaptar.Fill(Citydt); 

      citiesdrdolst.DataSource = Citydt; 
      citiesdrdolst.DataTextField = "City"; 
      citiesdrdolst.DataValueField = "CityID"; 
      citiesdrdolst.DataBind(); 
     } 

     citiesdrdolst.Items.Insert(0, new ListItem("Select City", "0")); 
    } 

    protected void citiesdrdolst_SelectedIndexChanged(object sender, EventArgs e) 
    { 

    } 

    } 
} 

Answer 1

dropdownlist.Text得到DropDownList控件的SelectedValue属性。

我认为dropdownlist.SelectedItem.Text应该给你国家的名字，但我不能在一分钟内检查它。

但是，最好在您的userinfo表中存储ID而不是名称。如果一个国家的名称改变了，或者一个城市可以以多种方式拼写，会怎么样呢？