check bugs

OpenAuth.App/FlowInstanceApp.cs

@@ -436,7 +436,7 @@ namespace OpenAuth.App
 
         public void Update(FlowInstance flowScheme)
         {
-            Repository.Update(u => u.Id == flowScheme.Id, u => new FlowInstance());
+            Repository.Update(flowScheme);
         }
 
         public TableData Load(QueryFlowInstanceListReq request)

OpenAuth.Repository/BaseRepository.cs

@@ -30,7 +30,7 @@ namespace OpenAuth.Repository
         }
 
         /// <summary>
-        /// 查找单个
+        /// 查找单个，且不被上下文所跟踪
         /// </summary>
         public T FindSingle(Expression<Func<T, bool>> exp)
         {
@@ -87,9 +87,14 @@ namespace OpenAuth.Repository
         public void Update(T entity)
         {
             var entry = this.Context.Entry(entity);
-            //todo:如果状态没有任何更改，会报错
             entry.State = EntityState.Modified;
 
+            //如果数据没有发生变化
+            if (!this.Context.ChangeTracker.HasChanges())
+            {
+                return;
+            }
+
             Save();
         }
 

OpenAuth.Repository/OpenAuthDBContext.cs

@@ -19,9 +19,13 @@ namespace OpenAuth.Repository
         {
             Database.SetInitializer< OpenAuthDBContext>(null);
         }
+
         public OpenAuthDBContext()
-            :base("Name=OpenAuthDBContext")
-        { }
+            : base("Name=OpenAuthDBContext")
+        {
+            // 关闭语义可空判断
+            Configuration.UseDatabaseNullSemantics = true;
+        }
 
         public OpenAuthDBContext(string nameOrConnectionString)
             : base(nameOrConnectionString)

OpenAuth.UnitTest/TestWorkflow.cs

@@ -49,5 +49,12 @@ namespace OpenAuth.UnitTest
             Console.WriteLine(JsonHelper.Instance.Serialize(result.Result.FrmPreviewHtml));
         }
 
+        [TestMethod]
+        public void TestUpdate()
+        { //测试数据没有任何修改时EF报错的问题
+            var instance = _runApp.Get("d73e4412-9c49-4511-a30e-0d2f844afcee");
+            _runApp.Update(instance);
+        }
+
     }
 }