Chart圖表

這東西挺直觀

封裝個類

 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是個集合[Series1]表明藍色的柱子,那麼就會有[Series2] 設置來源顏色 能夠表明其餘的
            chart1.Series["Series1"].YValueMembers = "Number";
            
        }

很少說,這個chart能夠添加多個柱狀圖進行比較,他本身自動獲取Y軸最大值因此所比較的兩個單位在數值上不要相差不少,固然也能夠設計成餅型

在Series集合裏面再添加一個Series,用linq作

添加linq toSql類

   private void Form1_Load(object sender, EventArgs e)
        {
            DataClasses1DataContext context = new DataClasses1DataContext();
            List<Score> list = context.Score.Take(6).ToList();
            chart1.DataSource = list;
            chart1.Series["Series1"].XValueMember = "sno";
            chart1.Series["Series1"].YValueMembers = "degree";
            chart1.Series["Series2"].XValueMember = "cno";
            chart1.Series["Series2"].YValueMembers = "sno";
        }