使用方法：
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UploadImage ui = new UploadImage();
/***可选参数***/
ui.SetWordWater = "哈哈";//文字水印
// ui.SetPicWater = Server.MapPath("2.png");//图片水印(图片和文字都赋值图片有效)
ui.SetPositionWater = 4;//水印图片的位置 0居中、1左上角、2右上角、3左下角、4右下角
ui.SetSmallImgHeight = "110,40,20";//设置缩略图可以多个
ui.SetSmallImgWidth = "100,40,20";
//保存图片生成缩略图
var reponseMessage = ui.FileSaveAs(Request.Files[0], Server.MapPath("~/file/temp"));
//裁剪图片
var reponseMessage2 = ui.FileCutSaveAs(Request.Files[0], Server.MapPath("~/file/temp2"), 400, 300, UploadImage.CutMode.CutNo);
/***返回信息***/
var isError = reponseMessage.IsError;//是否异常
var webPath = reponseMessage.WebPath;//web路径
var filePath = reponseMessage.filePath;//物理路径
var message = reponseMessage.Message;//错误信息
var directory = reponseMessage.Directory;//目录
var smallPath1 = reponseMessage.SmallPath(0);//缩略图路径1
var smallPath2 = reponseMessage.SmallPath(1);//缩略图路径2
var smallPath3 = reponseMessage.SmallPath(2);//缩略图路径3
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效果：
源码：