c# - ZedGraph比例全部搞砸了

使用ZedGraph显示一段时间内的价格。显然，设置图形时我做错了什么。有任何想法吗？

这是我正在做的代码

private void Form1_Load(object sender, EventArgs e)
{
    myPane = zgc.GraphPane;

    // Set the Titles
    myPane.Title.Text = "Forex";
    myPane.XAxis.Title.Text = "Date/Time";
    myPane.YAxis.Title.Text = "Price";

    myPane.XAxis.Type = AxisType.Date;
    myPane.XAxis.Scale.MajorUnit = DateUnit.Minute;
    myPane.XAxis.Scale.Format = "T";
}

private void QueryDB(ref PointPairList lst)
{
    if (connection == null)
        connection = new MySql.Data.MySqlClient.MySqlConnection(connStr);

    try
    {
        if (connection.State == ConnectionState.Closed)
            connection.Open();

        string pair = cboPair.Text;
        string sql = "SELECT bid, ask, price_datetime FROM forex.prices WHERE pair='" + pair + "' and price_datetime > (NOW() - INTERVAL 1 MINUTE) ORDER BY price_datetime desc;";
        MySqlCommand cmd = new MySqlCommand(sql, connection);
        MySqlDataReader rdr = cmd.ExecuteReader();

        while (rdr.Read())
        {
            DateTime tm = rdr.GetDateTime("price_datetime");
            double bid = rdr.GetDouble("bid");
            lst.Add(tm.ToOADate(), bid);
        }
        rdr.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    finally
    {
    }
}

private void cmdRefresh_Click(object sender, EventArgs e)
{
    PointPairList bidPrice = new PointPairList();

    QueryDB(ref bidPrice);

    LineItem myCurve = myPane.AddCurve("Bid", bidPrice, Color.Red);

    myPane.YAxis.Scale.MinAuto = true;
    myPane.YAxis.Scale.MaxAuto = true;

    myPane.XAxis.Scale.MinAuto = true;
    myPane.XAxis.Scale.MaxAuto = true;

    zgc.AxisChange();

    // just points not lines. bigger points and colored based on
    // buy or sell. red for sell, green for buy
    //PointPairList tradeEntries = new PointPairList();
}

最佳答案

阅读您的代码后，我发现了一段看起来不适合zedgraph含义的代码。

lst.Add(tm.ToOADate(), bid);

您需要将日期解析为OADate吗？如果您将其设为XDate，则可以将其用作Double

XDate tm = rdr.GetDateTime("price_datetime");
double bid = rdr.GetDouble("bid");
lst.Add((double)tm, bid);