将 C# 中的 DataGrid 绑定到 MySQL - MySQL 连接问题

Question

我有一个简单的程序，试图在 WPF/C# 应用程序中显示一个 MySQL 表。现在，由于某种原因，我似乎遇到了连接问题，我无法弄清楚它是什么。

我的主窗口：

<Window x:Class="WpfApplication5.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Szuper adatbázisfeltöltő" Height="267.143" Width="525">
    <Grid>
        <TabControl HorizontalAlignment="Left" Height="236" VerticalAlignment="Top" Width="517">
            <TabItem Header="Adatbázis">
                <Grid Background="#FFE5E5E5">
                    <DataGrid x:Name="dataGrid1" ItemsSource="{Binding}" AutoGenerateColumns="True" HorizontalAlignment="Left" Margin="3,10,0,0" VerticalAlignment="Top" Height="119" Width="441"/>
                    <Button Content="Új rekord" HorizontalAlignment="Left" Margin="0,134,0,0" VerticalAlignment="Top" Width="75"/>
                    <Button Content="Frissítés" HorizontalAlignment="Left" Margin="80,134,0,0" VerticalAlignment="Top" Width="75"/>
                    <Button Content="Törlés" HorizontalAlignment="Left" Margin="160,134,0,0" VerticalAlignment="Top" Width="75"/>
                </Grid>
            </TabItem>
            <TabItem Header="Adminisztráció">
                <Grid Background="#FFE5E5E5"/>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

当我运行程序时会发生什么：

public MainWindow()
{
    InitializeComponent();
    UpdateGrid();
}

public void UpdateGrid()
{
  //  dataGrid1.DataContext = Class1.getTable().DefaultView;
    //dataGrid1.SelectedValuePath = "index";
}

}

魔法应该发生的地方：

   class Class1
    {
        static String str = "Server=http://mysql10.000webhost.com;Database=a2116591_adat;Uid=a2116591_tkis;Pwd=zseton22";
        static MySqlConnection con = null;

        public static DataTable getTable()
        {

            //MySqlDataReader Object
            MySqlDataReader reader = null;
            try
            {
                con = new MySqlConnection(str);
                con.Open(); //open the connection
                //We will need to SELECT all or some columns in the table
                //via this command
                String cmdText = "SELECT * FROM adat";
                MySqlCommand cmd = new MySqlCommand(cmdText, con);
                reader = cmd.ExecuteReader(); //execute the reader
                DataTable dt = new DataTable();
                dt.Load(reader);
                return dt;
            }
            catch (MySqlException err)
            {
                Console.WriteLine("Error: " + err.ToString());
                return null;
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                }
                if (con != null)
                {
                    con.Close(); //close the connection

                }
            }
        }
    }
}

我尝试改变连接字符串，但无济于事，我有点卡住了。

Answer 1

  class Class1
   {
       static String str = "your connection string";
      static MySqlConnection con = null;

    public static DataSet getTable()
    {

        //MySqlDataReader Object
        MySqlDataReader reader = null;
        try
        {
            con = new MySqlConnection(str);
            con.Open(); //open the connection
            //We will need to SELECT all or some columns in the table
            //via this command
            String cmdText = "SELECT * FROM adat";
            MySqlCommand cmd = new MySqlCommand(cmdText, con);

OleDbDataAdapter da = new OleDbDataAdapter(cmd);
      DataSet  ds = new DataSet();
        da.Fill(ds, "R");
        con.Close();
        return ds;


        }
        catch (MySqlException err)
        {
            Console.WriteLine("Error: " + err.ToString());
            return null;
        }
        finally
        {
            if (reader != null)
            {
                reader.Close();
            }
            if (con != null)
            {
                con.Close(); //close the connection

            }
        }
    }
}

}

    public MainWindow()
  {
  InitializeComponent();
   UpdateGrid();
  } 

 public void UpdateGrid()
{
   dataGrid1.DataMember = "R";
        dataGrid1.DataSource = class1.gettable();
}