update:请求加密&防篡改

QRCodeService/Extensions/StringExtension.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
@@ -17,5 +18,30 @@ namespace QRCodeService.Extensions
                 return result;
             }
         }
+        public static DateTime? ToDate(this string dateTimeStr, string[] dateFmt)
+        {
+            // example: var dt = "2011-03-21 13:26".toDate(new string[]{"yyyy-MM-dd HH:mm", 
+            //                                                  "M/d/yyyy h:mm:ss tt"});
+            const DateTimeStyles style = DateTimeStyles.AllowWhiteSpaces;
+            if (dateFmt == null)
+            {
+                var dateInfo = System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat;
+                dateFmt = dateInfo.GetAllDateTimePatterns();
+            }
+            DateTime? result = null;
+            DateTime dt;
+            if (DateTime.TryParseExact(dateTimeStr, dateFmt,
+               CultureInfo.InvariantCulture, style, out dt)) result = dt;
+            return result;
+        }
+
+        public static DateTime? ToDate(this string dateTimeStr, string dateFmt = null)
+        {
+            // example:   var dt="2011-03-21 13:26".toDate("yyyy-MM-dd HH:mm");
+            // or simply  var dt="2011-03-21 13:26".toDate();        
+            // call overloaded function with string array param
+            string[] dateFmtArr = dateFmt == null ? null : new string[] { dateFmt };
+            return ToDate(dateTimeStr, dateFmtArr);
+        }
     }
 }