使用C＃從代碼后面綁定下拉列表

Question

我正在嘗試從后面的代碼綁定下拉框，但出現編譯錯誤：

'System.Web.UI.WebControls.SqlDataSource'不包含'DataSource'的定義

我試圖弄清楚，但似乎無法解決此問題。

<asp:DropDownList ID="MYDDL" Width="300px" DataTextField="PRJ_TITLE" AutoPostBack="true"
                  DataValueField="PRJ_ID" runat="server">
</asp:DropDownList> 

這是我的功能：

private void Bind_DD()
{
    String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["myCon"].ConnectionString;
    SqlConnection con2 = new SqlConnection(strConnString);
    SqlDataAdapter sda = new SqlDataAdapter();
    SqlCommand cmd1 = new SqlCommand("SELECT  ID, PRJ_TITLE FROM myTable");

    cmd1.Connection = con2;
    con2.Open();

    myDDL.DataSource = cmd1.ExecuteReader();
    myDDL.DataTextField = "PRJ_TITLE";
    myDDL.DataValueField = "ID";
    myDDL.DataBind();

    con2.Close();

}

Answer 1

所以看起來您可能對sql數據連接有些困惑，因為有很多方法可以做到。 我選擇通過sqlDataAdapter到DataTable進行數據處理。

此外，請確保您的標記中沒有任何元素，在標記中的任何位置都具有asp：SqlDataSource。

private void Bind_DD()
{
    DataTable dt = new DataTable();

    using(SqlConnection con2 = new SqlConnection(ConfigurationManager.ConnectionStrings["myCon"].ConnectionString))
    {
        con2.Open();

        SqlCommand cmd1 = new SqlCommand("SELECT  ID, PRJ_TITLE FROM myTable",con2);
        SqlDataAdapter sda = new SqlDataAdapter(cmd1);
        sda.Fill(dt);
    }

    myDDL.DataSource = dt;
    myDDL.DataTextField = "PRJ_TITLE";
    myDDL.DataValueField = "ID";
    myDDL.DataBind();

}

Answer 2

嘗試這個：

private void Bind_DD()
{
    String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["myCon"].ConnectionString;
    SqlConnection con2 = new SqlConnection(strConnString);

    DataSet ds = new DataSet();
    SqlCommand cmd1 = new SqlCommand("SELECT  ID, PRJ_TITLE FROM myTable");
    cmd1.Connection = con2;
    con2.Open();
    SqlDataAdapter sda = new SqlDataAdapter(cmd1);
    sda.Fill(ds);
    myDDL.DataSource = ds; //cmd1.ExecuteReader();
    myDDL.DataTextField = "PRJ_TITLE";
    myDDL.DataValueField = "ID";
    myDDL.DataBind();
    con2.Close();
    //myDDL.DataBind(); 
 }