NBearMapping是
NBearV4框架的组件之一，可以独立使用。可用于任意类型对象、DataRow和DataReader对象间的透明映射。推荐结合
NBearLite使用。
主要功能：1、任意类型对象、DataRow和DataReader对象间的透明映射；
2、支持.NET的Nullable类型；
3、较高的性能，性能比基于Reflection的等价转换快约50%，手动代码 vs NBearMapping vs Reflection对象转换的执行时间比大约为1:2.5:3.6，可参见源码中MappingTest.TestPerformance() 测试；
源码、示例及文档下载：
NBearMapping_v1.0.0.2_beta.zip使用演示：
1
[TestMethod]
2 public void TestDataRowToObject()
3
{
4
ObjectMapper mapper = new ObjectMapper(typeof(DataRow), typeof(User));
5 mapper.AddCustomMappingName("UserID", "ID");
6 User user = (User)mapper.ConvertObject(table.Rows[0]);
7 Assert.AreEqual(table.Rows[0]["UserID"], user.ID);
8 Assert.AreEqual(table.Rows[0]["Name"], user.Name);
9 User user2 = new User();
10 mapper.ConvertObject(table.Rows[0], user2);
11 Assert.AreEqual(table.Rows[0]["UserID"], user2.ID);
12 Assert.AreEqual(table.Rows[0]["Name"], user2.Name);
13
}
14
15 [TestMethod]
16 public void TestDataReaderToObject()
17 {
18 ObjectMapper mapper = new ObjectMapper(typeof(IDataReader), typeof(User));
19 mapper.AddCustomMappingName("UserID", "ID");
20 IDataReader reader = table.CreateDataReader();
21 reader.Read();
22 User user = (User)mapper.ConvertObject(reader);
23 Assert.AreEqual(table.Rows[0]["UserID"], user.ID);
24 Assert.AreEqual(table.Rows[0]["Name"], user.Name);
25 User user2 = new User();
26 IDataReader reader2 = table.CreateDataReader();
27 reader2.Read();
28 mapper.ConvertObject(reader2, user2);
29 Assert.AreEqual(table.Rows[0]["UserID"], user2.ID);
30 Assert.AreEqual(table.Rows[0]["Name"], user2.Name);
31 }
32
33 [TestMethod]
34 public void ObjectToObject()
35 {
36 ObjectMapper mapper = new ObjectMapper(typeof(User), typeof(User));
37 User user = (User)mapper.ConvertObject(user3);
38 Assert.AreEqual(user3.ID, user.ID);
39 Assert.AreEqual(user3.Name, user.Name);
40 User user2 = new User();
41 mapper.ConvertObject(user3, user2);
42 Assert.AreEqual(user3.ID, user2.ID);
43 Assert.AreEqual(user3.Name, user2.Name);
44 }
45
46 [TestMethod]
47 public void TestObjectToDataTableDataReaderAndDataRow()
48 {
49 ObjectMapper mapper = new ObjectMapper(typeof(User), typeof(DataTable));
50 mapper.AddCustomMappingName("ID", "UserID");
51 DataTable userTable = (DataTable)mapper.ConvertObject(user3);
52 Assert.AreEqual(user3.ID, userTable.Rows[0]["UserID"] == DBNull.Value ? null : userTable.Rows[0]["UserID"]);
53 Assert.AreEqual(user3.Name, userTable.Rows[0]["Name"]);
54 mapper.ConvertObject(user3, userTable);
55 Assert.AreEqual(user3.ID, userTable.Rows[1]["UserID"] == DBNull.Value ? null : userTable.Rows[1]["UserID"]);
56 Assert.AreEqual(user3.Name, userTable.Rows[1]["Name"]);
57
58 mapper = new ObjectMapper(typeof(User), typeof(IDataReader));
59 mapper.AddCustomMappingName("ID", "UserID");
60 IDataReader reader = (IDataReader)mapper.ConvertObject(user3);
61 Assert.IsNotNull(reader);
62
63 mapper = new ObjectMapper(typeof(User), typeof(DataRow));
64 mapper.AddCustomMappingName("ID", "UserID");
65 DataRow row = (DataRow)mapper.ConvertObject(user3);
66 Assert.IsNotNull(row);
67 } 修订
7/26 更新至v1.0.0.1 修复1.0.0.0中的set null值的bug。 8/6 更新至v1.0.0.2 支持枚举类型字段