1 files changed, 37 insertions, 0 deletions
diff --git a/Timeline/Services/TimelineMemberOperationUserException.cs b/Timeline/Services/TimelineMemberOperationUserException.cs
new file mode 100644
index 00000000..543ee160
--- /dev/null
+++ b/Timeline/Services/TimelineMemberOperationUserException.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Globalization;
+
+namespace Timeline.Services
+{
+    [Serializable]
+    public class TimelineMemberOperationUserException : Exception
+    {
+        public enum MemberOperation
+        {
+            Add,
+            Remove
+        }
+
+        public TimelineMemberOperationUserException() : base(Resources.Services.Exception.TimelineMemberOperationException) { }
+        public TimelineMemberOperationUserException(string message) : base(message) { }
+        public TimelineMemberOperationUserException(string message, Exception inner) : base(message, inner) { }
+        protected TimelineMemberOperationUserException(
+          System.Runtime.Serialization.SerializationInfo info,
+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }
+
+        public TimelineMemberOperationUserException(int index, MemberOperation operation, string username, Exception inner)
+            : base(MakeMessage(operation, index), inner) { Operation = operation; Index = index; Username = username; }
+
+        private static string MakeMessage(MemberOperation operation, int index) => string.Format(CultureInfo.CurrentCulture,
+            Resources.Services.Exception.TimelineMemberOperationExceptionDetail, operation, index);
+
+        public MemberOperation? Operation { get; set; }
+
+        /// <summary>
+        /// The index of the member on which the operation failed.
+        /// </summary>
+        public int? Index { get; set; }
+
+        public string? Username { get; set; }
+    }
+}