Question

我正在尝试从后面的代码绑定下拉框，但是我收到了编译错误：

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

我试图搞清楚但似乎无法解决这个问题。

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

这是我的功能：

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

所以看起来你可能有点混淆sql数据连接，因为有很多方法可以做到这一点。我选择通过sqlDataAdapter对DataTable进行数据处理。

另外，请确保标记中没有任何元素在标记中的任何位置包含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

试试这个：

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(); 
 }

使用C＃从代码绑定下拉列表

2 个答案: