随笔- 12 文章- 0 评论- 36 阅读- 27096

AutoMapper 创建嵌套对象映射（原创）

之前在做DTO转换时，用到AutoMapper。但DTO的层次太深了，无奈官方没针对嵌套类型提供好的解决方案，于是自己实现了一下：

思路：采用递归和反射很好的避免手工创建嵌套对象的映射。

第一个版本，已经提交到：https://github.com/AutoMapper/AutoMapper/wiki/Nested-mappings

 1         /// <summary>
 2         /// 递归创建类型间的映射关系 (Recursively create mappings between types)
 3         ///created by cqwang
 4         /// </summary>
 5         /// <param name="sourceType"></param>
 6         /// <param name="destinationType"></param>
 7         public static void CreateNestedMappers(Type sourceType, Type destinationType)
 8         {
 9             PropertyInfo[] sourceProperties = sourceType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
10             PropertyInfo[] destinationProperties = destinationType.GetProperties(BindingFlags.Public | BindingFlags.Instance);
11             foreach (var destinationProperty in destinationProperties)
12             {
13                 Type destinationPropertyType = destinationProperty.PropertyType;
14                 if (Filter(destinationPropertyType))
15                     continue;
16 
17                 PropertyInfo sourceProperty = sourceProperties.FirstOrDefault(prop => NameMatches(prop.Name, destinationProperty.Name));
18                 if (sourceProperty == null)
19                     continue;
20 
21                 Type sourcePropertyType=sourceProperty.PropertyType;
22                 if (destinationPropertyType.IsGenericType)
23                 {
24                     Type destinationGenericType = destinationPropertyType.GetGenericArguments()[0];
25                     if (Filter(destinationGenericType))
26                         continue;
27 
28                     Type sourceGenericType = sourcePropertyType.GetGenericArguments()[0];
29                     CreateMappers(sourceGenericType, destinationGenericType);
30                 }
31                 else
32                 {
33                     CreateMappers(sourcePropertyType, destinationPropertyType);
34                 }
35             }
36 
37             Mapper.CreateMap(sourceType, destinationType);
38         }
39 
40         /// <summary>
41         /// 过滤 (Filter)
42         /// </summary>
43         /// <param name="type"></param>
44         /// <returns></returns>
45         static bool Filter(Type type)
46         {
47             return type.IsPrimitive || NoPrimitiveTypes.Contains(type.Name);
48         }
49 
50         static readonly HashSet<string> NoPrimitiveTypes = new HashSet<string>() { "String", "DateTime", "Decimal" };
51 
52         private static bool NameMatches(string memberName, string nameToMatch)
53         {
54             return String.Compare(memberName, nameToMatch, StringComparison.OrdinalIgnoreCase) == 0;
55         }