配置与扩展

1、配置文件

  通过文件可以配置多个对象映射器，通过更换 default 的值即可实现无缝切换。配置文件如下：

• .Net Framework 下的 app.config 或 web.config 文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <sectionGroup name="fireasy">
      <section name="objMappers" type="Fireasy.Common.Mapper.Configuration.ObjectMapperConfigurationSectionHandler, Fireasy.Common" />
    </sectionGroup>
  </configSections>
  <fireasy>
    <objMappers default="automapper">
      <mapper name="automapper" type="Fireasy.AutoMapper.ObjectMapper, Fireasy.AutoMapper" />
      <mapper name="demo" type="demo.ObjectMapper, demo" />
    </objMappers>
  </fireasy>
</configuration>

• .Net Core 下的 appsettings.json 文件

{
  "fireasy": {
    "objMappers": {
      "default": "automapper",
      "settings": {
        "automapper": {
          "type": "Fireasy.AutoMapper.ObjectMapper, Fireasy.AutoMapper"
        },
        "demo": {
          "type": "demo.ObjectMapper, demo"
        }
      }
    }
  }
}

  ObjectMapperFactory 工厂类可以根据配置创建一个 IObjectMapper 实例。如下所示：

[TestMethod]
public void TestCreateMapper()
{
    var mapper1 = ObjectMapperFactory.CreateMapper();
    Assert.IsNotNull(mapper1); // AutoMapper

    var mapper2 = ObjectMapperFactory.CreateMapper("demo");
    Assert.IsNotNull(mapper2); // demo
}

  在使用 IOC 的环境中，通过构造注入或属性注入得到的 IObjectMapper 的实例对应的是指向 default 的配置项。

2、第三方适配

• AutoMapper

• Mapster