Question

好的，所以我尝试将ListBox中的多个选定值添加到数据库中。为每位患者选择多个测试名称（取决于要求），并将它们插入名为

的列中

测试名。

例如：如果我为患者选择ANA，CBC，则应在TESTNAME列中针对该患者姓名添加BOTH值。我在互联网上尝试了一些建议，但我没有成功。我发布了我的相关asp.net代码和C＃代码（我的最新尝试）。

使用最新的尝试，它会抛出错误，说明变量名称＆＃39; @ TestName＆＃39;已经宣布。变量名在查询批处理或存储过程中必须是唯一的。

请注意我是初学者，所以我也非常感谢你的一些解释。 GRIDVIEW的asp.net代码：

<div id="mbody">
                <div class="gview">
                    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CssClass="gview" DataSourceID="SqlDataSource1" DataKeyNames="PID">
                        <Columns>
                            <asp:CommandField ShowDeleteButton="True" />
                            <asp:BoundField DataField="PID" HeaderText="PID" InsertVisible="False" ReadOnly="True" SortExpression="PID" />
                            <asp:BoundField DataField="Pname" HeaderText="Pname" SortExpression="Pname" />
                            <asp:BoundField DataField="Gender" HeaderText="Gender" SortExpression="Gender" />
                            <asp:BoundField DataField="Consultant" HeaderText="Consultant" SortExpression="Consultant" />
                            <asp:BoundField DataField="TestName" HeaderText="TestName" SortExpression="TestName" />
                            <asp:BoundField DataField="RequestDate" HeaderText="RequestDate" SortExpression="RequestDate" />
                            <asp:BoundField DataField="ReportDate" HeaderText="ReportDate" SortExpression="ReportDate" />
                        </Columns>

                    </asp:GridView>
                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SMCConnectionString %>" SelectCommand="SELECT [PID], [Pname], [Gender], [Consultant], [TestName], [RequestDate], [ReportDate] FROM [Patient]" DeleteCommand="DELETE FROM [Patient] WHERE [PID] = @PID" InsertCommand="INSERT INTO [Patient] ([Pname], [Gender], [Consultant], [TestName], [RequestDate], [ReportDate]) VALUES (@Pname, @Gender, @Consultant, @TestName, @RequestDate, @ReportDate)" UpdateCommand="UPDATE [Patient] SET [Pname] = @Pname, [Gender] = @Gender, [Consultant] = @Consultant, [TestName] = @TestName, [RequestDate] = @RequestDate, [ReportDate] = @ReportDate WHERE [PID] = @PID">
                        <DeleteParameters>
                            <asp:Parameter Name="PID" Type="Int32" />
                        </DeleteParameters>
                        <InsertParameters>
                            <asp:Parameter Name="Pname" Type="String" />
                            <asp:Parameter Name="Gender" Type="String" />
                            <asp:Parameter Name="Consultant" Type="String" />
                            <asp:Parameter Name="TestName" Type="String" />
                            <asp:Parameter Name="RequestDate" Type="String" />
                            <asp:Parameter Name="ReportDate" Type="String" />
                        </InsertParameters>
                        <UpdateParameters>
                            <asp:Parameter Name="Pname" Type="String" />
                            <asp:Parameter Name="Gender" Type="String" />
                            <asp:Parameter Name="Consultant" Type="String" />
                            <asp:Parameter Name="TestName" Type="String" />
                            <asp:Parameter Name="RequestDate" Type="String" />
                            <asp:Parameter Name="ReportDate" Type="String" />
                            <asp:Parameter Name="PID" Type="Int32" />
                        </UpdateParameters>
                    </asp:SqlDataSource>
                </div>

ListBox aspx代码：

<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple" Height="57px" Width="270px">
                            <asp:ListItem>ANA</asp:ListItem>
                            <asp:ListItem>ASMA</asp:ListItem>
                            <asp:ListItem>ASO-titres</asp:ListItem>
                            <asp:ListItem>ESR</asp:ListItem>
                            <asp:ListItem>CBC</asp:ListItem>
                            <asp:ListItem>Anti-double Stranded DNA ab</asp:ListItem>
                        </asp:ListBox>

我的C＃代码：

 protected void Button3_Click(object sender, EventArgs e)
    {
        string str = "update Patient set TestName=@TestName, RequestDate=@RequestDate ,ReportDate=@ReportDate, Consultant=@Consultant where PID = '" + TextBox7.Text + "'";
        cmd = new SqlCommand(str, con);
        foreach (ListItem li in ListBox1.Items)
        {
            if (li.Selected)
            {
                cmd.Parameters.AddWithValue("@TestName", ListBox1.SelectedItem.Text);
            }
        }
        cmd.Parameters.AddWithValue("@RequestDate", TextBox4.Text.ToString());
        cmd.Parameters.AddWithValue("@ReportDate", TextBox5.Text.ToString());
        cmd.Parameters.AddWithValue("@Consultant", TextBox6.Text);
        con.Open();
        int flag = cmd.ExecuteNonQuery();
        if (flag == 1)    //On successful updation, shows a popup message
        {
            string msg = "Operation Successful";
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            sb.Append("<script type = 'text/javascript'>");
            sb.Append("window.onload=function(){");
            sb.Append("alert('");
            sb.Append(msg);
            sb.Append("')};");
            sb.Append("</script>");
            ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", sb.ToString());
        }
        else if (flag == 0)
        {
            string msg1 = "Operation Unsuccessful";
            System.Text.StringBuilder sb1 = new System.Text.StringBuilder();
            sb1.Append("<script type = 'text/javascript'>");
            sb1.Append("window.onload=function(){");
            sb1.Append("alert('");
            sb1.Append(msg1);
            sb1.Append("')};");
            sb1.Append("</script>");
            ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", sb1.ToString());
        }
        con.Close();
    }

也许我需要追加或连接或其他东西。但我不知道该怎么做。任何帮助将不胜感激。

Answer 1

您不能两次添加相同的参数名称。你提到过：

应在TESTNAME列中添加BOTH值

所以我想你想要连接选定的值，如果是这样的话你可以这样做：

var items = new List<string>();           
foreach (ListItem li in ListBox1.Items)
{
    if (li.Selected)
    {
        items.Add(li.Text);
    }
}
cmd.Parameters.AddWithValue("@TestName", string.Join(",", items));

循环通过ListBox将选定的值添加到数据库

1 个答案: