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ASP.net C＃和mysql中的下拉列表

[英]Dropdownlist in ASP.net C# and mysql

 原文  2010-11-15 06:08:38  8   3    c#/ asp.net

问题描述

I have a table 'TYPE' in this table i have 2 columns as 'SKEY' AND 'CASECODE'. 我在此表中有一个表“ TYPE”，我有2列作为“ SKEY”和“ CASECODE”。

'SKEY' contains text value and 'CASECODE' contains the corresponding numeric value. “ SKEY”包含文本值，“ CASECODE”包含相应的数值。

I have bound the values in the column 'SKEY' to a DropdownList control in ASP.net 3.5 C#, What i want is on selection of one item in the DropdownList the corresponding value in the column 'CASECODE' should be displayed. 我已经将'SKEY'列中的值绑定到ASP.net 3.5 C＃中的DropdownList控件，我想要的是选择DropdownList中的一项时，应显示'CASECODE'列中的相应值。

I have created a datasource for a dropdown list and i want to have DataTextField which is visible to the user to be a value from column SKEY and dropdownlistDataValueField to be a value from column 'casecode' but when i try to do 我已经为下拉列表创建了一个数据源，我想让用户可见的DataTextField是SKEY列中的值，而dropdownlistDataValueField是来自'casecode'列中的值，但是当我尝试这样做时 

<asp:DropDownList ID="DropDownList3" runat="server" 
            DataSourceID="SqlDataSource1" DataTextField="skey" DataValueField="casecode" 
            AppendDataBoundItems="True">
            <asp:ListItem Selected="True" Value="S">Select</asp:ListItem>
        </asp:DropDownList>

DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'casecode'.


Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'casecode'.

My .aspx code 我的.aspx代码 

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit.HTMLEditor" tagprefix="cc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form title="orderfrm"  id="form1" runat="server" onsubmit="validate()" >
    <div>
        <br />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <b>

        <asp:Label ID="Label1" runat="server" style="font-size: x-large" 
            Text="Order Modify"></asp:Label>

        <br />
        </b>
        <br />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Label ID="Label2" runat="server" style="font-weight: 700" 
            Text="High Court:"></asp:Label>
&nbsp;

<asp:DropDownList ID="DropDownList1" runat="server" 
            >
            <asp:ListItem>Panaji</asp:ListItem>
        </asp:DropDownList>
        &nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Label ID="Label3" runat="server" style="font-weight: 700" 
            Text="Stmp/Regn.:"></asp:Label>

        &nbsp;&nbsp;


        <asp:DropDownList ID="DropDownList2" runat="server">
            <asp:ListItem Value="R">Registrer</asp:ListItem>
            <asp:ListItem Value="S">Stamp</asp:ListItem>
        </asp:DropDownList>

        <br />
        <br />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Label ID="Label4" runat="server" style="font-weight: 700" Text="Type:"></asp:Label>

        &nbsp;

        <asp:DropDownList ID="DropDownList3" runat="server" 
            DataSourceID="SqlDataSource1" DataTextField="skey" DataValueField="casecode" 
            AppendDataBoundItems="True">
            <asp:ListItem Selected="True" Value="S">Select</asp:ListItem>
        </asp:DropDownList>

        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" 
            ControlToValidate="DropDownList3" ErrorMessage="Select Case Type" 
            InitialValue="S">*</asp:RequiredFieldValidator>


        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>" 
            ProviderName="<%$ ConnectionStrings:ConnectionString2.ProviderName %>" 
            SelectCommand="SELECT testcase.casetype.skey FROM testcase.casetype">
        </asp:SqlDataSource>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Label ID="Label5" runat="server" style="font-weight: 700" Text="No"></asp:Label>

&nbsp;&nbsp;
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>

        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
            ControlToValidate="TextBox2" ErrorMessage="Enter Case No">*</asp:RequiredFieldValidator>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Label ID="Label6" runat="server" style="font-weight: 700" Text="Year:"></asp:Label>
&nbsp;&nbsp;

        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>

        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
            ControlToValidate="TextBox3" ErrorMessage="Enter Year">*</asp:RequiredFieldValidator>

        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" 
            ControlToValidate="TextBox3" ErrorMessage="Enter Valid Year" 
            ValidationExpression="^\d{4}$"></asp:RegularExpressionValidator>


        <br />
        <br />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Label ID="Label7" runat="server" style="font-weight: 700" 
            Text="Order Date"></asp:Label>


        &nbsp;&nbsp;&nbsp;
        <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>


        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" 
            ControlToValidate="TextBox4" ErrorMessage="Enter Date">*</asp:RequiredFieldValidator>


        <asp:Label ID="Label8" runat="server" style="font-weight: 700" 
            Text="(dd/mm/yyyy)"></asp:Label>

        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" 
            ControlToValidate="TextBox4" ErrorMessage="Enter Valid Date" 
            ValidationExpression="^(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d$"></asp:RegularExpressionValidator>

        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:Button ID="Button2" runat="server" style="font-weight: 700" Text="Go" 
            onclick="Button2_Click"/>

        <asp:ValidationSummary ID="ValidationSummary1" runat="server" />
        <br />
    </div>

    <cc1:Editor ID="Editor1" runat="server" AutoFocus="true" Height="200px" Width="500px" ActiveMode="Design" Font-Strikeout="false" />
    <br />



  <asp:ScriptManager ID="ScriptManager2" 
  runat="server" > </asp:ScriptManager>


    <br />
    <br />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Show" />
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    <asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Select" />
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    <asp:Button ID="Button4" runat="server" onclick="Button4_Click" 
        Text="next page" />
    </form>
</body>
</html>

3 个解决方案

解决方案1
 0  2010-11-15 06:25:27

Try binding your DataTextField and DataValueField - 尝试绑定您的DataTextField和DataValueField- 

dropdownlist.DataSource = <GetData>();
dropdownlistDataTextField="<SKEY column values>"; 
dropdownlistDataValueField="<CASECODE column values>";
dropdownlist.DataBind();

解决方案2
 0  2010-11-15 06:29:06

我不确定您要问的是什么，但是dropdownlist.SelectedValue将为您casecode在这种情况下为案例代码的值。

解决方案3
 0 已采纳  2010-11-15 07:41:41

The select command of your data source does not include a field named casecode: 数据源的select命令不包含名为casecode的字段： 

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>" 
        ProviderName="<%$ ConnectionStrings:ConnectionString2.ProviderName %>" 
        SelectCommand="SELECT testcase.casetype.skey FROM testcase.casetype">
</asp:SqlDataSource>

Probably you want to edit SelectCommand to something like this (depending on how your database looks like): 可能您想将SelectCommand编辑为如下所示（取决于数据库的外观）： 

SelectCommand="SELECT testcase.casetype, testcase.casetype.skey FROM testcase.casetype"

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