建造者模式

专题/后端/DDD/7、Hi,建造者模式.md

@@ -0,0 +1,47 @@
+```
+    public class ToDoItemBuilder
+    {
+        private ToDoItem _todo = new ToDoItem();
+
+        public ToDoItemBuilder Id(int id)
+        {
+            _todo.Id = id;
+            return this;
+        }
+
+        public ToDoItemBuilder Title(string title)
+        {
+            _todo.Title = title;
+            return this;
+        }
+
+
+        public ToDoItemBuilder Description(string description)
+        {
+            _todo.Description = description;
+            return this;
+        }
+
+        public ToDoItemBuilder WithDefaultValues()
+        {
+            _todo = new ToDoItem { Id = 1, Title = "title", Description = "desc" };
+            return this;
+        }
+
+        public ToDoItem Build() => _todo;
+    }
+```
+
+
+
+```
+    public class ToDoItem : BaseEntity, IAggregateRoot
+    {
+        public string Title { get; set; } = string.Empty;
+        public string Description { get; set; }
+        public bool IsDone { get; private set; }
+
+		......
+    }
+```
+