多系列MSChart

Question

我是MSChart的新手，下面的代码适用于多系列专栏。但我知道应该有一种更短的方式来显示多系列，而不是求助于创建两个数据表，或者用很少的代码来更好地显示多系列，比如使用DataBindTable或DataBindCrossTable。

有没有更短的方法来做我下面正在做的事情？顺便说一句，我想要做的是显示在给定学年有多少学生注册。

String sql, sql2;

sql = @"SELECT Major, SchoolYear,  COUNT(*) as TotalStudents 
                FROM StudentList 
                WHERE Major='AFT' 
                GROUP BY Major, Schoolyear";

sql2 = @"SELECT Major, SchoolYear,  COUNT(*) as TotalStudents 
                FROM StudentList 
                WHERE Major='AFT' 
                GROUP BY Major, Schoolyear";

        SqlConnection con = new SqlConnection(connString);

        con.Open();
        SqlDataAdapter dta = new SqlDataAdapter(sql, con);
        DataSet dst = new DataSet();
        DataTable dt;
        dta.Fill(dst);
        dt = dst.Tables[0];

        chart1.Width = 900;
        chart1.ChartAreas[0].AxisX.Title = "School Year";
        chart1.ChartAreas[0].AxisY.Title = "Enrollment";

        chart1.Series[0].Name = dt.Rows[0][0].ToString();
        chart1.Series[0].XValueMember = "SchoolYear";
        chart1.Series[0].YValueMembers = "TotalStudents";
        chart1.Series[0].Points.DataBindXY(dt.CreateDataReader(),"SchoolYear", dt.CreateDataReader(), "TotalStudents");


        dta = new SqlDataAdapter(sql2, con);
        dst = new DataSet();
        dta.Fill(dst);
        dt = dst.Tables[0];
        chart1.Series.Add(dt.Rows[0][0].ToString());
        chart1.Series[1].XValueMember = "SchoolYear";
        chart1.Series[1].YValueMembers = "TotalStudents";
        chart1.Series[1].Points.DataBindXY(dt.CreateDataReader(), "SchoolYear", dt.CreateDataReader(), "TotalStudents");

Answer 1

你会试试下面的吗？

String sql, sql2;

sql = @"SELECT Major, SchoolYear,  COUNT(*) as TotalStudents 
                FROM StudentList 
                WHERE Major='AFT' 
                GROUP BY Major, Schoolyear";


        SqlConnection con = new SqlConnection(connString);

        con.Open();
        SqlDataAdapter dta = new SqlDataAdapter(sql, con);
        DataSet dst = new DataSet();
        DataTable dt;
        dta.Fill(dst);
        dt = dst.Tables[0];

        chart1.DataSource = dt;

        chart1.Width = 900;
        chart1.ChartAreas["abc"].AxisX.Title = "School Year";
        chart1.ChartAreas["abc"].AxisY.Title = "Enrollment";

        chart1.Series["xyz"].Name = dt.Rows[0][0].ToString();
        chart1.Series["xyz"].XValueMember = "SchoolYear";
        chart1.Series["xyz"].YValueMembers = "TotalStudents";


        chart1.DataBind();

HTML：

            <asp:Chart ID="chart1" runat="server" ImageStorageMode="UseImageLocation" ImageLocation="ChartPic_#SEQ(300,3)">
                <ChartAreas>
                    <asp:ChartArea Name="abc">
                    </asp:ChartArea>
                </ChartAreas>
            </asp:Chart>