一、Code39 条形码生成原理 完整可运行代码1.1 Code39 核心原理考试必背黑白严格交替条码竖单元永远是 黑→白→黑→白不会连续同色单个字符固定9位2宽单元 7窄单元1宽条0窄条完整结构起始* 分隔0 内容字符 分隔0 结束*支持字符集数字0-9、大写字母A-Z、符号-. $/%*1.2 完整条形码生成代码using System; using System.Drawing; using System.Windows.Forms; namespace _01条形码 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } /// summary /// 生成标准Code39条形码位图 /// /summary /// param namesourceCode编码字符串/param /// returns条形码Bitmap图片/returns public Bitmap GetCode39(string sourceCode) { // 边距、宽窄条尺寸、条码高度配置 int leftMargin 5; int topMargin 0; int thickLength 2; // 宽条宽度 int narrowLength 1; // 窄条宽度 int barHeight 35; int strLength sourceCode.Length; // Code39起始/结束符 * 对应的二进制编码 string startEndCode 010010100; Font font new Font(Segoe UI, 5); // Code39合法字符集与编码数组一一对应 string alphaBet 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/%*; // Code39标准编码表一一对应上面字符集 string[] code39EncodeArr { 000110100, 100100001, 001100001, 101100000, 000110001, 100110000, 001110000, 000100101, 100100100, 001100100, 100001001, 001001001, 101001000, 000011001, 100011000, 001011000, 000001101, 100001100, 001001100, 000011100, 100000011, 001000011, 101000010, 000010011, 100010010, 001010010, 000000111, 100000110, 001000110, 000010110, 110000001, 011000001, 111000000, 010010001, 110010000, 011010000, 010000101, 110000100, 011000100, 010101000, 010100010, 010001010, 000101010, 010010100 }; // Code39只支持大写统一转换 sourceCode sourceCode.ToUpper(); string totalEncode startEndCode; // 拼接每个字符编码字符之间用0分隔 for (int i 0; i strLength; i) { int index alphaBet.IndexOf(sourceCode[i]); // 非法字符校验 if (index -1) { Bitmap errBmp new Bitmap(200, 50); Graphics gErr Graphics.FromImage(errBmp); gErr.FillRectangle(Brushes.White, 0, 0, errBmp.Width, errBmp.Height); gErr.DrawString(存在不合法字符, SystemFonts.DefaultFont, Brushes.Red, 10, 10); return errBmp; } totalEncode 0 code39EncodeArr[index]; } // 拼接结束符 totalEncode 0 startEndCode; // 根据编码总长度创建位图 int totalWidth 0; foreach (var c in totalEncode) { totalWidth c 1 ? thickLength : narrowLength; } Bitmap objBitMap new Bitmap(totalWidth leftMargin * 2, barHeight topMargin * 2); Graphics g Graphics.FromImage(objBitMap); g.FillRectangle(Brushes.White, 0, 0, objBitMap.Width, objBitMap.Height); // 逐位绘制黑白条码奇偶交替配色 int currentX leftMargin; for (int i 0; i totalEncode.Length; i) { int barWidth totalEncode[i] 1 ? thickLength : narrowLength; Brush brush i % 2 0 ? Brushes.Black : Brushes.White; g.FillRectangle(brush, currentX, topMargin, barWidth, barHeight); currentX barWidth; } return objBitMap; } // 生成按钮点击事件 private void button1_Click(object sender, EventArgs e) { if (!string.IsNullOrEmpty(textBox1.Text)) { pictureBox1.Image GetCode39(textBox1.Text); } } } }二、WinForm Chart 图表全套柱状图静态数据 饼图数据库绑定2.1 辅助实体类public class MyChart { public int X { get; set; } public int Y { get; set; } }2.2 完整图表绘制代码using System; using System.Collections.Generic; using System.Data.SqlClient; using System.Drawing; using System.Windows.Forms; using System.Windows.Forms.DataVisualization.Charting; namespace _03图表 { public partial class Form1 : Form { public Form1() { InitializeComponent(); Chart1(); // 静态柱状图 Chart2(); // 数据库饼图 } /// summary /// 静态数据柱状图全套样式美化 /// /summary public void Chart1() { // 1. 绑定XY轴静态数据 string[] xData { 南山大队, 福田大队, 罗湖大队, 潮河大队 }; double[] yData { 100, 150, 10, 97 }; chart1.Series[0].Points.DataBindXY(xData, yData); // 2. 多标题设置 chart1.Titles.Clear(); // 主标题 Title title1 new Title(案情分析图); title1.ForeColor Color.Red; title1.Font new Font(楷体, 12f, FontStyle.Italic); title1.Alignment ContentAlignment.TopLeft; chart1.Titles.Add(title1); // 副标题 Title title2 new Title(合计2026宗); title2.ForeColor Color.Black; title2.Font new Font(楷体, 8f, FontStyle.Regular); title2.Alignment ContentAlignment.TopRight; chart1.Titles.Add(title2); // 3. X轴样式配置 chart1.ChartAreas[0].AxisX.Interval 1; chart1.ChartAreas[0].AxisX.IsInterlaced true; chart1.ChartAreas[0].AxisX.LabelStyle.Angle -45; chart1.ChartAreas[0].AxisX.Title 局所; chart1.ChartAreas[0].AxisX.TitleFont new Font(宋体, 20); chart1.ChartAreas[0].AxisX.TitleForeColor Color.GreenYellow; chart1.ChartAreas[0].AxisX.LineColor Color.Red; chart1.ChartAreas[0].AxisX.LabelStyle.Font new Font(宋体, 10); chart1.ChartAreas[0].AxisX.MajorGrid.Enabled true; chart1.ChartAreas[0].AxisX.MajorGrid.LineColor ColorTranslator.FromHtml(#0000ff); // 4. Y轴样式配置 chart1.ChartAreas[0].AxisY.LabelStyle.Angle -45; chart1.ChartAreas[0].AxisY.Title 宗数; chart1.ChartAreas[0].AxisY.TitleFont new Font(宋体, 20); chart1.ChartAreas[0].AxisY.TitleForeColor Color.GreenYellow; chart1.ChartAreas[0].AxisY.LineColor Color.Red; chart1.ChartAreas[0].AxisY.LabelStyle.Font new Font(宋体, 10); // 5. 图例、数据标签 chart1.Series[0].LegendText 案件数量; chart1.Series[0].XValueType ChartValueType.String; chart1.Series[0].Label #VAL; // 显示数值 chart1.Series[0].LabelForeColor Color.Red; } /// summary /// 数据库读取数据 饼图展示 /// /summary public void Chart2() { ListMyChart list new ListMyChart(); // 数据库连接字符串 string connStr server.,1344;databasecodefirstDB;uidsa;password123456; using (SqlConnection conn new SqlConnection(connStr)) { conn.Open(); string sql select * from Table_1; SqlCommand cmd new SqlCommand(sql, conn); SqlDataReader reader cmd.ExecuteReader(); while (reader.Read()) { MyChart model new MyChart(); model.X Convert.ToInt32(reader[X]); model.Y Convert.ToInt32(reader[Y]); list.Add(model); } } // 绑定数据、设置饼图样式 chart3.Series[0].Points.DataBind(list, X, Y, null); chart3.Series[0].ChartType SeriesChartType.Pie; chart3.Series[0].ToolTip #VAL; chart3.Titles.Clear(); chart3.Titles.Add(综合分析图); } } }三、核心知识点总结考试重点1. Code39 条码核心交替绘图原理i%20奇偶切换黑白条1宽条、0窄条固定9位单字符编码首尾必须带 * 起始结束符中间字符0分隔2. Chart图表核心静态绑定DataBindXY(x数组,y数组)实体绑定DataBind(集合,X字段,Y字段)图表类型切换SeriesChartType.Pie/Column内置变量#VAL展示当前数值可自定义坐标轴颜色、角度、标题、网格线3. 数据库饼图流程打开连接 → 执行查询 → DataReader读取数据封装实体 → 集合绑定图表 → 渲染饼图