init project

QRCodeService/Extensions/StringExtension.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QRCodeService.Extensions
+{
+    public static class StringExtension
+    {
+        public static byte[] ToMD5(this string value)
+        {
+            using (var md5 = MD5.Create())
+            {
+                var result = md5.ComputeHash(Encoding.UTF8.GetBytes(value));
+                return result;
+            }
+        }
+    }
+}