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iMES.WebApi/Helper/UploadHelp.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace iMES.Bi
+{
+    public class UploadHelp
+    {
+
+        public static string GetFileType(string extname)
+        {
+            switch (extname.ToLower())
+            {
+                case "gif":
+                case "jpg":
+                case "bmp":
+                case "jpeg":
+                case "tiff":
+                case "png":
+                    return "pic";
+                default:
+                    return extname.ToLower().TrimStart('.');
+            }
+        }
+
+
+        /// <summary>
+        /// 生成指定长度的随机码。
+        /// </summary>
+        public static string CreateRandomCode(int length)
+        {
+            string[] codes = new string[36] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
+            StringBuilder randomCode = new StringBuilder();
+            Random rand = new Random();
+            for (int i = 0; i < length; i++)
+            {
+                randomCode.Append(codes[rand.Next(codes.Length)]);
+            }
+            return randomCode.ToString();
+        }
+
+        /// <summary>
+        /// 表示图片的上传结果。
+        /// </summary>
+      
+    }
+
+
+}