將ListBox2項存儲在SQL表中

Question

在我的網頁中，我有2個列表框，即ListBox1，ListBox2。用戶從ListBox1中選擇項目列表並將其移動到ListBox2。 我做到了這一點 ，但是在我單擊“保存”按鈕后，它不會保存SQL表中的ListBox2選定項目並且它不會拋出任何錯誤！ 如何存放？

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
         lblPage1ID.Text=Server.UrlDecode(Request.QueryString["Parameter"].ToString());
         ListBoxWorksPackages();
        }
    }

    protected void ListBoxWorksPackages()
    {
        ListBox1.Items.Add("General Contractor");
        ListBox1.Items.Add("Architecture");
        ListBox1.Items.Add("Civil");
        ListBox1.Items.Add("Mechanical");
        ListBox1.Items.Add("Electrical");
    }

    protected void btnMoveRight1_Click(object sender, EventArgs e)
    {
        for (int i = ListBox1.Items.Count - 1; i >= 0; i--)
        {
            if (ListBox1.Items[i].Selected == true)
            {
                ListBox2.Items.Add(ListBox1.Items[i]);
                ListItem li = ListBox1.Items[i];
                ListBox1.Items.Remove(li);
            }
        }
    }

    protected void btnMoveLeft1_Click(object sender, EventArgs e)
    {
        for (int i = ListBox2.Items.Count - 1; i >= 0; i--)
        {
            if (ListBox2.Items[i].Selected == true)
            {
                ListBox1.Items.Add(ListBox2.Items[i]);
                ListItem li = ListBox2.Items[i];
                ListBox2.Items.Remove(li);
            }
        }
    }

    protected void BtnSave1_Click(object sender, EventArgs e)
    {
        SqlConnection SqlCon = new SqlConnection(GetConnectionString());

        string Packagevalues = string.Empty;
        foreach (ListItem item in ListBox2.Items)
        {
            if (item.Selected == true)
            {
               Packagevalues += "," + item.Text; 
            }
        }

        string query = "INSERT INTO Contractor_Info2 (Vendor_ID,WorksPackage) VALUES"
                           + "(@Vendor_ID,@WorksPackage )";

        try
        {
            SqlCommand cmd = new SqlCommand(query, SqlCon);
            cmd.CommandType = CommandType.Text;

            SqlCon.Open();

            cmd.Parameters.AddWithValue("@Vendor_ID", lblPage1ID.Text);
            cmd.Parameters.AddWithValue("@WorksPackage", Packagevalues);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            SqlCon.Close();
        }
    }

Answer 1

在將參數添加到sql過程后，需要調用cmd.ExecuteNonQuery() 。 這是實際運行sql語句的內容。

    try
    {
        SqlCommand cmd = new SqlCommand(query, SqlCon);
        cmd.CommandType = CommandType.Text;

        SqlCon.Open();

        cmd.Parameters.AddWithValue("@Vendor_ID", lblPage1ID.Text);
        cmd.Parameters.AddWithValue("@WorksPackage", Packagevalues);
        // add this
        cmd.ExecuteNonQuery();
    }