support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Data/Operation/OperationResult!1.cs

@@ -0,0 +1,23 @@
+namespace HandyControl.Data
+{
+    /// <summary>
+    ///     表示一个操作的返回结果信息
+    /// </summary>
+    public class OperationResult<T> : OperationResult
+    {
+        /// <summary>
+        ///     操作结果
+        /// </summary>
+        public ResultType ResultType { get; set; }
+
+        /// <summary>
+        ///     返回数据
+        /// </summary>
+        public T Data { get; set; }
+
+        /// <summary>
+        ///     操作消息（包含错误原因等数据）
+        /// </summary>
+        public string Message { get; set; }
+    }
+}

Net35/HandyControl_Net35/Data/Operation/OperationResult.cs

@@ -0,0 +1,25 @@
+namespace HandyControl.Data
+{
+    public class OperationResult
+    {
+        public static OperationResult<bool> Failed(string message = "")
+        {
+            return new OperationResult<bool>
+            {
+                ResultType = ResultType.Failed,
+                Message = message,
+                Data = false
+            };
+        }
+
+        public static OperationResult<bool> Success(string message = "")
+        {
+            return new OperationResult<bool>
+            {
+                ResultType = ResultType.Success,
+                Message = message,
+                Data = true
+            };
+        }
+    }
+}