C# Graph Error 只能设置1个Y值

Question

尝试了网上有关错误的代码

You can only set 1 Y values for this data point. Parameter name: yValue

try
{
    con.Open();
    cmd = new OleDbCommand("SELECT Sum(GrandTotal) AS SumOfGrandTotal,InvoiceDate FROM Invoice GROUP BY InvoiceDate HAVING (InvoiceDate between #" + dateTimePicker1.Value + "# and #" + dateTimePicker2.Value + "#);", con);
    OleDbDataAdapter da = new OleDbDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);
    DataView source = new DataView(ds.Tables[0]);
    chart1.DataSource = source;
    dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
    while (dr.Read() == true)
    {
        chart1.Series[0].Points.AddXY(dr["InvoiceDate"].ToString());//,dr["GrandTotal"].ToString());
        //chart1.Series[0].YValuesPerPoint = 2;
    }
    con.Close();
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

我正在使用 c# winforms. This code is for Chart Column. I want to get the date on ms-access 数据库并获取他们的总计。

Answer 1

尝试改变

chart1.Series[0].Points.AddXY(dr["InvoiceDate"].ToString());//,dr["GrandTotal"].ToString());

至

chart1.Series[0].Points.AddXY(dr["InvoiceDate"].ToString(), (double)dr["SumOfGrandTotal"]);

C# Graph Error 只能设置1个Y值

C# Graph Error can only set 1 Y values

c#

charts

ms-access-2010

winforms