C# 繪製統計圖大全(柱狀圖, 折線圖, 扇形圖)_C#教程

統計圖形種類繁多, 有柱狀圖, 折線圖, 扇形圖等等, 而統計圖形的繪製方法也有很多, 有Flash製作的統計圖形, 有水晶報表產生統計圖形, 有專門製圖軟體製作, 也有程式設計語言自己製作的；這裡我們用就C# 製作三款最經典的統計圖: 柱狀圖, 折線圖和扇形圖；既然是統計, 當然需要資料, 這裡示範的資料存於Sql Server2000中, 三款統計圖形都是動態產生. 其中柱狀圖我會附上製作步驟, 其他兩款統計圖直接附源碼.

說明: 需求不一樣, 統計圖形繪製後的顯示效果也不一樣, 比如這裡柱狀圖的主要需求是為了比較每一期報名人數與通過人數的差, 因此會把兩根柱子放在一起會使比較結果一目瞭然. 因此大家可以根據需要靈活繪製.

一. 柱狀圖的繪製.

繪製步驟如下:

1. 定義繪圖用到的類.

int height = 500, width = 700;Bitmap image = new Bitmap(width, height);Graphics g = Graphics.FromImage(image);Pen mypen = new Pen(brush, 1);

2. 繪製圖框.

g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);

3. 繪製橫向座標線

for (int i = 0; i < 14; i++) {g.DrawLine(mypen, x, 80, x, 340);x = x + 40;} 

4. 繪製縱向座標線

for (int i = 0; i < 9; i++) {g.DrawLine(mypen, 60, y, 620, y);y = y + 26;}

5. 繪製橫座標值

String[] n = { "第一期", "第二期", "第三期", "第四期", "全年" };for (int i = 0; i < 7; i++) {g.DrawString(n[i].ToString(), font, Brushes.Blue, x, 348); x = x + 78;}

6. 繪製縱座標值

String[] m = {"250","225", "200", "175", "150", "125", "100“};for (int i = 0; i < 10; i++) {g.DrawString(m[i].ToString(), font, Brushes.Blue, 25, y);y = y + 26;}

7. 定義數組儲存資料庫中統計的資料

int[] Count1 = new int[7]; //儲存從資料庫讀取的報名人數int[] Count2 = new int[7]; //儲存從資料庫讀取的通過人數

8. 從資料庫中讀取報名人數與通過人數

SqlConnection Con = new SqlConnection("Server=(Local);Database=committeeTraining;");Con.Open();string cmdtxt2 = "SELECT * FROM ##Count where Company='" + ****+ "'";SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);DataSet ds = new DataSet();da.Fill(ds);

9. 將讀取的資料存放區到數組中

Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count1”].ToString()); Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count3”].ToString()); Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count2”].ToString()); Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count4"].ToString());

10.定義畫筆和畫刷準備繪圖

x = 80; Font font2 = new System.Drawing.Font("Arial", 10, FontStyle.Bold);SolidBrush mybrush = new SolidBrush(Color.Red);SolidBrush mybrush2 = new SolidBrush(Color.Green);

11. 根據數組中的值繪製柱狀圖

(1)第一期報名人數

g.FillRectangle(mybrush, x, 340 - Count1[0], 20, Count1[0]);g.DrawString(Count1[0].ToString(), font2, Brushes.Red, x, 340 - Count1[0] - 15);

(2) 第一期通過人數

x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[0], 20, Count2[0]);g.DrawString(Count2[0].ToString(), font2, Brushes.Green, x, 340 - Count2[0] - 15);

12. 將圖形輸出到頁面.

System.IO.MemoryStream ms = new System.IO.MemoryStream();image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType = "image/Jpeg";Response.BinaryWrite(ms.ToArray());

最終柱狀圖的效果圖:
柱狀圖的完整代碼:

private void CreateImage(){int height = 500, width = 700;Bitmap image = new Bitmap(width, height);//建立Graphics類對象Graphics g = Graphics.FromImage(image);try{//清空圖片背景色g.Clear(Color.White);Font font = new Font("Arial", 10, FontStyle.Regular);Font font1 = new Font("宋體", 20, FontStyle.Bold);LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.BlueViolet, 1.2f, true);g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);// Brush brush1 = new SolidBrush(Color.Blue);g.DrawString(this.ddlTaget.SelectedItem.Text + " " + this.ddlYear.SelectedItem.Text + " 成績統計柱狀圖", font1, brush, new PointF(70, 30));//畫圖片的邊框線g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 1, image.Height - 1);Pen mypen = new Pen(brush, 1);//繪製線條//繪製橫向線條int x = 100;for (int i = 0; i < 14; i++){g.DrawLine(mypen, x, 80, x, 340);x = x + 40;}Pen mypen1 = new Pen(Color.Blue, 2);x = 60;g.DrawLine(mypen1, x, 80, x, 340);//繪製縱向線條int y = 106;for (int i = 0; i < 9; i++){g.DrawLine(mypen, 60, y, 620, y);y = y + 26;}g.DrawLine(mypen1, 60, y, 620, y);//x軸String[] n = { "第一期", "第二期", "第三期", "第四期", "上半年", "下半年", "全年統計" };x = 78;for (int i = 0; i < 7; i++){g.DrawString(n[i].ToString(), font, Brushes.Blue, x, 348); //設定文字內容及輸出位置x = x + 78;}//y軸String[] m = {"250","225", "200", "175", "150", "125", "100", " 75"," 50", " 25", " 0"};y = 72;for (int i = 0; i < 10; i++){g.DrawString(m[i].ToString(), font, Brushes.Blue, 25, y); //設定文字內容及輸出位置y = y + 26;}int[] Count1 = new int[7];int[] Count2 = new int[7];SqlConnection Con = new SqlConnection("Server=(Local);Database=committeeTraining;Uid=sa;Pwd=**");Con.Open();string cmdtxt2 = "SELECT * FROM ##Count where Company='" + this.ddlTaget.SelectedItem.Text.Trim() + "'";SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);DataSet ds = new DataSet();da.Fill(ds);Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count1"].ToString());Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count3"].ToString());Count1[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count5"].ToString());Count1[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count7"].ToString());Count1[4] = Count1[0] + Count1[1];Count1[5] = Count1[2] + Count1[3];Count1[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count9"].ToString());Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count2"].ToString());Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count4"].ToString());Count2[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count6"].ToString());Count2[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count8"].ToString());Count2[4] = Count2[0] + Count2[1];Count2[5] = Count2[2] + Count2[3];Count2[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count10"].ToString());//繪製柱狀圖.x = 80;Font font2 = new System.Drawing.Font("Arial", 10, FontStyle.Bold);SolidBrush mybrush = new SolidBrush(Color.Red);SolidBrush mybrush2 = new SolidBrush(Color.Green);//第一期g.FillRectangle(mybrush, x, 340 - Count1[0], 20, Count1[0]);g.DrawString(Count1[0].ToString(), font2, Brushes.Red, x, 340 - Count1[0] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[0], 20, Count2[0]);g.DrawString(Count2[0].ToString(), font2, Brushes.Green, x, 340 - Count2[0] - 15);//第二期x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[1], 20, Count1[1]);g.DrawString(Count1[1].ToString(), font2, Brushes.Red, x, 340 - Count1[1] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[1], 20, Count2[1]);g.DrawString(Count2[1].ToString(), font2, Brushes.Green, x, 340 - Count2[1] - 15);//第三期x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[2], 20, Count1[2]);g.DrawString(Count1[2].ToString(), font2, Brushes.Red, x, 340 - Count1[2] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[2], 20, Count2[2]);g.DrawString(Count2[2].ToString(), font2, Brushes.Green, x, 340 - Count2[2] - 15);//第四期x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[3], 20, Count1[3]);g.DrawString(Count1[3].ToString(), font2, Brushes.Red, x, 340 - Count1[3] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[3], 20, Count2[3]);g.DrawString(Count2[3].ToString(), font2, Brushes.Green, x, 340 - Count2[3] - 15);//上半年x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[4], 20, Count1[4]);g.DrawString(Count1[4].ToString(), font2, Brushes.Red, x, 340 - Count1[4] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[4], 20, Count2[4]);g.DrawString(Count2[4].ToString(), font2, Brushes.Green, x, 340 - Count2[4] - 15);//下半年x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[5], 20, Count1[5]);g.DrawString(Count1[5].ToString(), font2, Brushes.Red, x, 340 - Count1[5] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[5], 20, Count2[5]);g.DrawString(Count2[5].ToString(), font2, Brushes.Green, x, 340 - Count2[5] - 15);//全年x = x + 60;g.FillRectangle(mybrush, x, 340 - Count1[6], 20, Count1[6]);g.DrawString(Count1[6].ToString(), font2, Brushes.Red, x, 340 - Count1[6] - 15);x = x + 20;g.FillRectangle(mybrush2, x, 340 - Count2[6], 20, Count2[6]);g.DrawString(Count2[6].ToString(), font2, Brushes.Green, x, 340 - Count2[6] - 15);//繪製標識Font font3 = new System.Drawing.Font("Arial", 10, FontStyle.Regular);g.DrawRectangle(new Pen(Brushes.Blue), 170, 400, 250, 50); //繪製範圍框g.FillRectangle(Brushes.Red, 270, 410, 20, 10); //繪製小矩形g.DrawString("報名人數", font3, Brushes.Red, 292, 408);g.FillRectangle(Brushes.Green, 270, 430, 20, 10);g.DrawString("通過人數", font3, Brushes.Green, 292, 428);System.IO.MemoryStream ms = new System.IO.MemoryStream();image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType = "image/Jpeg";Response.BinaryWrite(ms.ToArray());}finally{g.Dispose();image.Dispose();}}

二. 折線統計圖的繪製

效果:

折線圖的完整代碼:

private void CreateImage(){int height = 480, width = 700;Bitmap image = new Bitmap(width, height);Graphics g = Graphics.FromImage(image);try{//清空圖片背景色g.Clear(Color.White);Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);Font font1 = new System.Drawing.Font("宋體", 20, FontStyle.Regular);Font font2 = new System.Drawing.Font("Arial", 8, FontStyle.Regular);LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Blue, 1.2f, true);g.FillRectangle(Brushes.AliceBlue, 0, 0, width, height);Brush brush1 = new SolidBrush(Color.Blue);Brush brush2 = new SolidBrush(Color.SaddleBrown);g.DrawString(this.ddlTaget.SelectedItem.Text + " " + this.ddlYear.SelectedItem.Text + " 成績統計折線圖", font1, brush1, new PointF(85, 30));//畫圖片的邊框線g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 1, image.Height - 1);Pen mypen = new Pen(brush, 1);Pen mypen2 = new Pen(Color.Red, 2);//繪製線條//繪製縱向線條int x = 60;for (int i = 0; i < 8; i++){g.DrawLine(mypen, x, 80, x, 340);x = x + 80;}Pen mypen1 = new Pen(Color.Blue, 3);x = 60;g.DrawLine(mypen1, x, 82, x, 340);//繪製橫向線條int y = 106;for (int i = 0; i < 10; i++){g.DrawLine(mypen, 60, y, 620, y);y = y + 26;}// y = 106;g.DrawLine(mypen1, 60, y - 26, 620, y - 26);//x軸String[] n = { "第一期", "第二期", "第三期", "第四期", "上半年", "下半年", "全年統計" };x = 45;for (int i = 0; i < 7; i++){g.DrawString(n[i].ToString(), font, Brushes.Red, x, 348); //設定文字內容及輸出位置x = x + 77;}//y軸String[] m = { "220人", " 200人", " 175人", "150人", " 125人", " 100人", " 75人", " 50人"," 25人"};y = 100;for (int i = 0; i < 9; i++){g.DrawString(m[i].ToString(), font, Brushes.Red, 10, y); //設定文字內容及輸出位置y = y + 26;}int[] Count1 = new int[7];int[] Count2 = new int[7];SqlConnection Con = new SqlConnection("Server=(Local);Database=committeeTraining;Uid=sa;Pwd=eesoft");Con.Open();string cmdtxt2 = "SELECT * FROM ##Count where Company='" + this.ddlTaget.SelectedItem.Text.Trim() + "'";SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);DataSet ds = new DataSet();da.Fill(ds);//報名人數Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count1"].ToString());Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count3"].ToString());Count1[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count5"].ToString());Count1[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count7"].ToString());Count1[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count9"].ToString()); //全年Count1[4] = Count1[0] + Count1[1];Count1[5] = Count1[2] + Count1[3];Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0]["count2"].ToString());Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0]["count4"].ToString());Count2[2] = Convert.ToInt32(ds.Tables[0].Rows[0]["count6"].ToString());Count2[3] = Convert.ToInt32(ds.Tables[0].Rows[0]["count8"].ToString());Count2[6] = Convert.ToInt32(ds.Tables[0].Rows[0]["count10"].ToString()); //全年Count2[4] = Count2[0] + Count2[1];Count2[5] = Count2[2] + Count2[3];//顯示折線效果Font font3 = new System.Drawing.Font("Arial", 10, FontStyle.Bold);SolidBrush mybrush = new SolidBrush(Color.Red);Point[] points1 = new Point[7];points1[0].X = 60; points1[0].Y = 340 - Count1[0]; //從106縱座標開始, 到(0, 0)座標時points1[1].X = 140; points1[1].Y = 340 - Count1[1];points1[2].X = 220; points1[2].Y = 340 - Count1[2];points1[3].X = 300; points1[3].Y = 340 - Count1[3];points1[4].X = 380; points1[4].Y = 340 - Count1[4];points1[5].X = 460; points1[5].Y = 340 - Count1[5];points1[6].X = 540; points1[6].Y = 340 - Count1[6];g.DrawLines(mypen2, points1); //繪製折線//繪製數字g.DrawString(Count1[0].ToString(), font3, Brushes.Red, 58, points1[0].Y - 20);g.DrawString(Count1[1].ToString(), font3, Brushes.Red, 138, points1[1].Y - 20);g.DrawString(Count1[2].ToString(), font3, Brushes.Red, 218, points1[2].Y - 20);g.DrawString(Count1[3].ToString(), font3, Brushes.Red, 298, points1[3].Y - 20);g.DrawString(Count1[4].ToString(), font3, Brushes.Red, 378, points1[4].Y - 20);g.DrawString(Count1[5].ToString(), font3, Brushes.Red, 458, points1[5].Y - 20);g.DrawString(Count1[6].ToString(), font3, Brushes.Red, 538, points1[6].Y - 20);Pen mypen3 = new Pen(Color.Green, 2);Point[] points2 = new Point[7];points2[0].X = 60; points2[0].Y = 340 - Count2[0];points2[1].X = 140; points2[1].Y = 340 - Count2[1];points2[2].X = 220; points2[2].Y = 340 - Count2[2];points2[3].X = 300; points2[3].Y = 340 - Count2[3];points2[4].X = 380; points2[4].Y = 340 - Count2[4];points2[5].X = 460; points2[5].Y = 340 - Count2[5];points2[6].X = 540; points2[6].Y = 340 - Count2[6];g.DrawLines(mypen3, points2); //繪製折線//繪製通過人數g.DrawString(Count2[0].ToString(), font3, Brushes.Green, 61, points2[0].Y - 15);g.DrawString(Count2[1].ToString(), font3, Brushes.Green, 131, points2[1].Y - 15);g.DrawString(Count2[2].ToString(), font3, Brushes.Green, 221, points2[2].Y - 15);g.DrawString(Count2[3].ToString(), font3, Brushes.Green, 301, points2[3].Y - 15);g.DrawString(Count2[4].ToString(), font3, Brushes.Green, 381, points2[4].Y - 15);g.DrawString(Count2[5].ToString(), font3, Brushes.Green, 461, points2[5].Y - 15);g.DrawString(Count2[6].ToString(), font3, Brushes.Green, 541, points2[6].Y - 15);//繪製標識g.DrawRectangle(new Pen(Brushes.Red), 180, 390, 250, 50); //繪製範圍框g.FillRectangle(Brushes.Red, 270, 402, 20, 10); //繪製小矩形g.DrawString("報名人數", font2, Brushes.Red, 292, 400);g.FillRectangle(Brushes.Green, 270, 422, 20, 10);g.DrawString("通過人數", font2, Brushes.Green, 292, 420);System.IO.MemoryStream ms = new System.IO.MemoryStream();image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);Response.ClearContent();Response.ContentType = "image/Jpeg";Response.BinaryWrite(ms.ToArray());}finally{g.Dispose();image.Dispose();}}

三. 扇形統計圖的繪製

扇形圖完整代碼:

private void CreateImage(){//把串連字串指定為一個常量SqlConnection Con = new SqlConnection("Server=(Local);Database=committeeTraining;Uid=sa;Pwd=**");Con.Open();string cmdtxt = selectString; // "select * from ##Count"; ////SqlCommand Com = new SqlCommand(cmdtxt, Con);DataSet ds = new DataSet();SqlDataAdapter Da = new SqlDataAdapter(cmdtxt, Con);Da.Fill(ds);Con.Close();float Total = 0.0f, Tmp;//轉換成單精確度。也可寫成Convert.ToInt32Total = Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]);// Total=Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]);//設定字型，fonttitle為主標題的字型Font fontlegend = new Font("verdana", 9);Font fonttitle = new Font("verdana", 10, FontStyle.Bold);//背景寬int width = 350;int bufferspace = 15;int legendheight = fontlegend.Height * 10 + bufferspace; //高度int titleheight = fonttitle.Height + bufferspace;int height = width + legendheight + titleheight + bufferspace;//白色背景高int pieheight = width;Rectangle pierect = new Rectangle(0, titleheight, width, pieheight);//加上各種隨機色ArrayList colors = new ArrayList();Random rnd = new Random();for (int i = 0; i < 2; i++)colors.Add(new SolidBrush(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))));//建立一個bitmap執行個體Bitmap objbitmap = new Bitmap(width, height);Graphics objgraphics = Graphics.FromImage(objbitmap);//畫一個白色背景objgraphics.FillRectangle(new SolidBrush(Color.White), 0, 0, width, height);//畫一個亮黃色背景 objgraphics.FillRectangle(new SolidBrush(Color.Beige), pierect);//以下為畫餅圖(有幾行row畫幾個)float currentdegree = 0.0f;//畫通過人數objgraphics.FillPie((SolidBrush)colors[1], pierect, currentdegree,Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) / Total * 360);currentdegree += Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) / Total * 360;//未通過人數餅狀圖objgraphics.FillPie((SolidBrush)colors[0], pierect, currentdegree,((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]))-(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))) / Total * 360);currentdegree += ((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) - (Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))) / Total * 360;//以下為產生主標題SolidBrush blackbrush = new SolidBrush(Color.Black);SolidBrush bluebrush = new SolidBrush(Color.Blue);string title = " 機關單位成績統計餅狀圖: "+ "\n \n\n";StringFormat stringFormat = new StringFormat();stringFormat.Alignment = StringAlignment.Center;stringFormat.LineAlignment = StringAlignment.Center;objgraphics.DrawString(title, fonttitle, blackbrush,new Rectangle(0, 0, width, titleheight), stringFormat);//列出各欄位與得數目objgraphics.DrawRectangle(new Pen(Color.Red, 2), 0, height + 10 - legendheight, width, legendheight + 50);objgraphics.DrawString("----------------統計資訊------------------", fontlegend, bluebrush, 20, height - legendheight + fontlegend.Height * 1 + 1);objgraphics.DrawString("統計單位: " + this.ddlTaget.SelectedItem.Text, fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 3 + 1);objgraphics.DrawString("統計年份: " + this.ddlYear.SelectedItem.Text, fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 4 + 1);objgraphics.DrawString("統計期數: " + this.ddlSpan.SelectedItem.Text, fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 5 + 1);objgraphics.FillRectangle((SolidBrush)colors[1], 5,height - legendheight + fontlegend.Height * 8 + 1, 10, 10);objgraphics.DrawString("報名總人數: " + Convert.ToString(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])), fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 7 + 1);objgraphics.FillRectangle((SolidBrush)colors[0], 5, height - legendheight + fontlegend.Height * 9 + 1, 10, 10);objgraphics.DrawString("通過總人數: " + Convert.ToString(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]])), fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 8 + 1);objgraphics.DrawString("未通過人數: " + ((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) - (Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))), fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 9 + 1);objgraphics.DrawString("通過率: " + Convert.ToString((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) / Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) * 100)+ " %", fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 10 + 1);Response.ContentType = "image/Jpeg";objbitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);objgraphics.Dispose();objbitmap.Dispose();}

 這裡的統計圖直接輸出到網頁，以上就是本文的全部內容，希望對大家的學習有所協助，也希望大家多多支援雲棲社區。