asp.net - 使用多次绑定时，Asp.net 中继器控制数据重复

Question

我正在使用 asp.net 2008 中继器控件。我试图在单击按钮时刷新中继器控件，它向我显示重复的值，这意味着它再次附加相同的值。这是我的代码

 public void LoadRepeater1()
    {
        con = new SqlConnection(ConfigurationManager.ConnectionStrings["SqlServerConnection"].ConnectionString);
        String sql;
        sql = "select * from FeeCollection Where AdminNo='"+lblstano.Text+"'";
        cmd = new SqlCommand(sql, con);
        da = new SqlDataAdapter(sql, con);
        da.Fill(ds, "FeeCollection");
        dt = ds.Tables["FeeCollection"];

        Repeater4.DataSource = dt;
        Repeater4.DataBind();
        con.Close();


    }

 protected void btnMedical_Click(object sender, EventArgs e)
    {
        LoadRepeater1();
    }

我想删除现有数据并刷新数据而不是追加。

Answer 1

不确定ds（DataSet）在哪里实例化。尝试DataSet/DataTable在 LoadRepeater1() 方法中实例化。

public void LoadRepeater1()
    {
        con = new SqlConnection(ConfigurationManager
         .ConnectionStrings["SqlServerConnection"].ConnectionString);

        sql = "select * from FeeCollection Where AdminNo=@AdminNo";
        cmd = new SqlCommand(sql, con);
        cmd.Parameters.Add("@AdminNo",System.Data.SqlDbType.VarChar,20).Value=lblstano.Text;
        da = new SqlDataAdapter(cmd);
        DataTable dt=new DataTable();
        da.Fill(dt);
        Repeater4.DataSource = dt;
        Repeater4.DataBind();
    }