AutoMapper扩展方法

Posted 2020-11-07 沉迷代码的萌新

DTO框架AutoMapper，知道很久了，今天有个前辈说好像最新版本不能用了，网上示例不行了，自己下载源码看了一下，琢磨了一下

写了一个简易版的

源git地址：

https://github.com/AutoMapper/AutoMapper

 

 1 调用
 2             DataTable tblDatas = new DataTable("Datas");
 3             tblDatas.Columns.Add("ID", typeof(int));
 4             tblDatas.Columns.Add("Product", typeof(string));
 5             tblDatas.Columns.Add("Version", typeof(string));
 6             tblDatas.Columns.Add("Description", typeof(string));
 7             tblDatas.Rows.Add(new object[] { 1, "a", "b", "c" });
 8             tblDatas.Rows.Add(new object[] { 2, "a", "b", "c" });
 9             tblDatas.Rows.Add(new object[] { 3, "a", "b", "c" });
10             tblDatas.Rows.Add(new object[] { 4, "a", "b", "c" });
11             tblDatas.Rows.Add(new object[] { 5, "a", "b", "c" });
12 
13             Mapper.Initialize(config =>
14             {
15                 config.CreateMapInformat<DataRow, Source>();
16                 config.CreateMapInformat<Source, Target>();
17             });
18             var source = tblDatas.Rows.OfType<DataRow>().Select(item => Mapper.Map<DataRow, Source>(item)).ToList();
19             var list = Mapper.Map<List<Source>, List<Target>>(source);

 1 对应的实体类代码
 2     public class Target
 3     {
 4         public int ID { get; set; }
 5         public string Product { get; set; }
 6         public string Version { get; set; }
 7         public string Description { get; set; }
 8     }
 9 
10     public class Source
11     {
12         public int ID { get; set; }
13         public string Product { get; set; }
14         public string Version { get; set; }
15         public string Description { get; set; }
16     }

 

扩展方法

 1     public static class MapperExtens
 2     {
 3         public static void CreateMapInformat<TSource, TDestination>( this IMapperConfigurationExpression config)
 4         {
 5             var sourceType = typeof(TSource);
 6             var destinationType = typeof(TDestination);
 7 
 8             config.CreateProfile(sourceType.Name, (profile) =>
 9             {
10                 if (sourceType.IsGenericType)
11                 {
12                     sourceType = sourceType.GetGenericTypeDefinition();
13                 }
14 
15                 if (destinationType.IsGenericType)
16                 {
17                     destinationType = destinationType.GetGenericTypeDefinition();
18                 }
19 
20                 var map = profile.CreateMap<TSource, TDestination>();
21                 foreach (var property in destinationType.GetProperties())
22                 {
23                     map.ForMember(property.Name, opt => opt.MapFrom(s => Reflex(s, property)));
24                 }
25 
26             });
27         }
28 
29         private static object Reflex<TSource>(TSource source, PropertyInfo property)
30         {
31             return DefaultForType(source, property);
32         }
33 
34         private static object DefaultForType<TSource>(TSource source, PropertyInfo property)
35         {
36             if (source.GetType() == typeof(DataRow))
37             {
38                 return (source as DataRow)?[property.Name];
39             }
40 
41             return FindPropertyInfo(source, property);  
42         }
43 
44         private static object FindPropertyInfo<TSource>(TSource source, PropertyInfo property)
45         {
46             if (typeof(TSource).IsValueType)
47             {
48                 return Activator.CreateInstance(property.PropertyType);
49             }
50             else
51             {
52                 return typeof(TSource).GetProperty(property.Name)?.GetValue(source);
53             }
54         }
55     }