Question

我试图用我的数据库的第一个表填充listView1。但它不起作用，有人可以帮助我吗？

函数LoadList无法识别DataTable DT

以下是我正在使用的代码

namespace Project.Data_Layer
{
    class Leerling
    {
        public static DataTable ExecSelect(string Leerling)
        {
            DataSet DS = new DataSet();
            SqlDataAdapter DA;
            DA = new SqlDataAdapter(Leerling, SQLString.Conn);
            DS.Clear();
            DA.Fill(DS);
            // 1e tabel uit database
            DataTable DT = DS.Tables[0];
            return DT;
        }

        public static bool ExecOverig(string Leerling)
        {
            bool gelukt = true;
            SqlConnection Connect = new SqlConnection(SQLString.Conn);
            SqlCommand Cmd = new SqlCommand(Leerling, Connect);
            try
            {
                Cmd.Connection.Open();
                Cmd.ExecuteNonQuery();
                Connect.Close();
            }
            catch
            {
                gelukt = false;
            }
            return gelukt;
        }

        public void LoadList()
        {
            if(DT.tables.count > 0)
            {
                listView1.DataSource = DT;
                listView1.DataBind();
            }
            else
            {
                //
            }
        }
    }
}

Answer 1

在方法＆＃39; ExecSelect＆＃39;

之外声明DataTable变量DT

DataTable DT = new DataTable();    
public static DataTable ExecSelect(string Leerling)
    {
        DataSet DS = new DataSet();
        SqlDataAdapter DA;
        DA = new SqlDataAdapter(Leerling, SQLString.Conn);
        DS.Clear();
        DA.Fill(DS);
        // 1e tabel uit database
        DT = DS.Tables[0];
        return DT;
    }

Answer 2

[enter image description here][1]
string sel = "select * from EmployeeMaster";
        DataTable dt = new DataTable();
        dt = con.filldata(sel);
        foreach(DataRow r in dt.Rows)
        {
            listView1.Items.Add(r["E_Name"].ToString());
            listView1.Items.Add(r["Salary"].ToString());

        }

  [1]: https://i.stack.imgur.com/72fmI.png

用C＃中的数据库表填充listview

2 个答案: