第一个：在一张图片上进行文字添加
参数：文件路径，添加内容
返回：文件名称
private string AddTextToImg(string fileName, string text){string phyfileName = Server.MapPath("..\\upload\\Pic\\") + fileName;string newPath = Server.MapPath("..\\upload\\Pic\\") + "timestamp_" + fileName;//var watermarkedStream = new MemoryStream();FileStream imgstream = File.OpenRead(phyfileName);using (var img = Image.FromStream(imgstream)){using (var graphic = Graphics.FromImage(img)){var font1 = new Font("微软雅黑", 16, FontStyle.Bold, GraphicsUnit.Pixel);//var color = Color.FromArgb(128, 255, 255, 255);var color = Color.Red;var brush = new SolidBrush(color);//var point = new Point(img.Width - 10, img.Height - 50);var point = new Point(10, 5);graphic.DrawString(text, font1, brush, point);img.Save(newPath);img.Dispose();imgstream.Dispose();if (File.Exists(phyfileName) && File.Exists(newPath)){File.Delete(phyfileName);}//img.Save(watermarkedStream, ImageFormat.Jpeg);}}return "timestamp_" + fileName;/*if (!File.Exists(phyfileName)){//throw new FileNotFoundException("The file don't exist!");}if (text == string.Empty){return;}//还需要判断文件类型是否为图像类型，这里就不赘述了System.Drawing.Image image = System.Drawing.Image.FromFile(phyfileName);Bitmap bitmap = new Bitmap(image, image.Width, image.Height);Graphics g = Graphics.FromImage(bitmap);float fontSize = 24.0f; //字体大小float textWidth = text.Length * fontSize; //文本的长度//下面定义一个矩形区域，以后在这个矩形里画上白底黑字float rectX = 0;float rectY = 0;float rectWidth = text.Length * (fontSize + 8);float rectHeight = fontSize + 8;//声明矩形域RectangleF textArea = new RectangleF(rectX, rectY, rectWidth, rectHeight);Font font = new Font("宋体", fontSize); //定义字体Brush whiteBrush = new SolidBrush(Color.Red); //白笔刷，画文字用Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷，画背景用g.FillRectangle(blackBrush, rectX, rectY, rectWidth, rectHeight);g.DrawString(text, font, whiteBrush, textArea);//MemoryStream ms = new MemoryStream();//保存为Jpg类型//bitmap.Save(ms, ImageFormat.Jpeg);//输出处理后的图像，这里为了演示方便，我将图片显示在页面中了//Response.Clear();//Response.ContentType = "image/jpeg";//Response.BinaryWrite(ms.ToArray());//保存加水印过后的图片,删除原始图片string newPath = Server.MapPath("..\\upload\\Pic\\") +"timestamp_"+ fileName;image.Save(newPath);image.Dispose();//已生成新水印图片，if (File.Exists(phyfileName) && File.Exists(newPath)){File.Delete(phyfileName);}g.Dispose();bitmap.Dispose();image.Dispose();* */}
第二个：测试代码性能
调用：using (new TestGC("List<string>"))
{
}
internal sealed class TestGC : IDisposable {private Stopwatch sw=new Stopwatch();private string text;private int count;//构造开始便进行一次重置public TestGC(string t) {PrepareForOperation();text = t;//同时统计一次垃圾回收次数：count = GC.CollectionCount(0);//时间重新开始计时sw.Start();}//using内容结束时，释放资源，统计垃圾回收次数public void Dispose() {Console.WriteLine("{0}，执行时间：{1}ms，垃圾回收次数：{2}",text,sw.ElapsedMilliseconds,GC.CollectionCount(0)-count);}//void IDisposable.Dispose()//{// throw new NotImplementedException();//}}///相当于进行垃圾回收重置操作，即先垃圾回收上一次遗留，并确保完成///并重新开始垃圾回收private static void PrepareForOperation() {GC.Collect();GC.WaitForPendingFinalizers();GC.Collect();}
每次开发相关功能，或是写测试案例，都要在电脑上找，不是很方便，这里统一放在这里，方便自己在不同终端上找，也方便其他伙伴，精力有限，未经优化整理，请见谅