Chart图表

这东西挺直观

封装个类

 public class aaa
    {
        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private int number;

        public int Number
        {
            get { return number; }
            set { number = value; }
        }
    }

 private void Form1_Load(object sender, EventArgs e)
        {
            List<aaa> ooo=new List<aaa>();
            SqlConnection conn = new SqlConnection("server=.;database=aaaaa;user=sa;pwd=123");
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = "select * from chart";
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.HasRows)
            {
                while (dr.Read())
                {
                    aaa rrr = new aaa();
                    rrr.Name=dr["name"].ToString();
                    rrr.Number = Convert.ToInt32(dr["degree"]);
                    ooo.Add(rrr);
                }
            }
            cmd.Dispose();
            conn.Close();
            chart1.DataSource=ooo;
            chart1.Series["Series1"].XValueMember ="name";  //Series是个集合[Series1]代表蓝色的柱子,那么就会有[Series2] 设置来源颜色 可以代表其他的
            chart1.Series["Series1"].YValueMembers = "Number";

        }

不多说,这个chart可以添加多个柱状图进行比较,他自己自动获取Y轴最大值所以所比较的两个单位在数值上不要相差很多,当然也可以设计成饼型

在Series集合里面再添加一个Series,用linq做

添加linq toSql类

   private void Form1_Load(object sender, EventArgs e)
        {
            DataClasses1DataContext context = new DataClasses1DataContext();
            List<Score> list = context.Score.Take().ToList();
            chart1.DataSource = list;
            chart1.Series["Series1"].XValueMember = "sno";
            chart1.Series["Series1"].YValueMembers = "degree";
            chart1.Series["Series2"].XValueMember = "cno";
            chart1.Series["Series2"].YValueMembers = "sno";
        }