update 20251113

Client - Kopie/Helper/Strings.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OnDoc.Helper
+{
+    public static class Strings
+    {
+        public static string Right(this string value, int length)
+        {
+            if (String.IsNullOrEmpty(value)) return string.Empty;
+
+            return value.Length <= length ? value : value.Substring(value.Length - length);
+        }
+
+        public static string Left(this string value, int maxLength)
+        {
+            if (string.IsNullOrEmpty(value)) return value;
+            maxLength = Math.Abs(maxLength);
+
+            return (value.Length <= maxLength
+                   ? value
+                   : value.Substring(0, maxLength)
+                   );
+        }
+        public static string Base64Encode(string plainText)
+        {
+            var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
+            return System.Convert.ToBase64String(plainTextBytes);
+        }
+        public static string Base64Decode(string base64EncodedData)
+        {
+            var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
+            return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
+        }
+    }
+}