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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TextTopic
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btntopic_Click(object sender, EventArgs e)
        {
            //获取文本
            string text = this.txtword.Text;

            if (string.IsNullOrEmpty(text))
            {
                MessageBox.Show("文本不能为空");
                return;
            }
            //得到Bitmap(传入Rectangle.Empty自动计算宽高)
            Bitmap bmp = TextToBitmap(text, this.txtword.Font, Rectangle.Empty, this.txtword.ForeColor, this.txtword.BackColor);

            //用PictureBox显示
            this.pbTextView.Image = bmp;

            //保存到桌面save.jpg

            string pathphe = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase   "pic";
            if (!System.IO.Directory.Exists(pathphe))
            {
                System.IO.Directory.CreateDirectory(pathphe);
            }
            String datename =System.DateTime.Now.ToString("MMddHHmmss");

            //string directory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.DesktopDirectory);
            bmp.Save(pathphe   "\\"   datename   ".jpg", ImageFormat.Jpeg);
        }

        /// <summary>
        /// 把文字转换才Bitmap
        /// </summary>
        /// <param name="text"></param>
        /// <param name="font"></param>
        /// <param name="rect">用于输出的矩形，文字在这个矩形内显示，为空时自动计算</param>
        /// <param name="fontcolor">字体颜色</param>
        /// <param name="backColor">背景颜色</param>
        /// <returns></returns>
        private Bitmap TextToBitmap(string text, Font font, Rectangle rect, Color fontcolor, Color backColor)
        {
            Graphics g;
            Bitmap bmp;
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            if (rect == Rectangle.Empty)
            {
                bmp = new Bitmap(1, 1);
                g = Graphics.FromImage(bmp);
                //计算绘制文字所需的区域大小（根据宽度计算长度），重新创建矩形区域绘图
                SizeF sizef = g.MeasureString(text, font, PointF.Empty, format);

                int width = (int)(sizef.Width   1);
                int height = (int)(sizef.Height   1);
                rect = new Rectangle(0, 0, width, height);
                bmp.Dispose();

                bmp = new Bitmap(width, height);
            }
            else
            {
                bmp = new Bitmap(rect.Width, rect.Height);
            }

            g = Graphics.FromImage(bmp);

            //使用ClearType字体功能
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            g.FillRectangle(new SolidBrush(backColor), rect);
            g.DrawString(text, font, Brushes.Black, rect, format);
            return bmp;
        }
    }
}