public void Creatchart2(string wax)//损耗率饼形图
{
//chart4.Series.Clear();
string dbPath = @"D:\历年高考分数.db";
string sq = @"Data Source=" + dbPath;
m = new SQLiteConnection(sq);
m.Open();
SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select " + wax + ",Volume1 from 饼形图1", m);
DataSet ds = new DataSet();
mAdapter.Fill(ds);
DataTable dt = ds.Tables[0];
//设置图表的数据源
//string[] g = new string[] { "温度", "振动", "紫外线", "臭氧" };
chart4.Series[0].ChartType = SeriesChartType.Doughnut;
chart4.Series[0].XValueMember = "Volume1";//图例文字
chart4.Series[0].YValueMembers = wax;//饼形图上数据
chart4.Series[0].XValueType = ChartValueType.String;//防止图例文本显示为0
chart4.Series[0].IsValueShownAsLabel = true;//
//Chart1.Series[0].IsXValueIndexed = false;
chart4.Series[0].Label = "#PERCENT";
chart4.Series[0].LegendText = "#VALX";
//Chart1.Series[0].ToolTip = "#VALX";
chart4.Series["Series1"].Label = "#PERCENT{P2}";
chart4.DataBind();
chart4.BringToFront();
m.Close();
}
单拿出来做一个项目(就一个窗口),不需要主窗口传wax值时,可以出图(如下图)
当此程序在子窗口时,需要主窗口传wax值时,不出图了
请问是哪里出问题了