AutoMapper简明教程(学习笔记)
最近做项目,需要把DataTable中的数据强类型化.于是试用了下比较常用的AutoMapper,通过看代码中附带的Demo与网上的教程,也算能够勉强使用了,现将学习笔记记录如下:
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//1.普通转换
Name name1 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.BeforeMap((name, nameDto) => Console.WriteLine("hello world before"))
.AfterMap((name, nameDto) => Console.WriteLine("hello world after"));
NameDto nameDto1 = Mapper.Map<Name, NameDto>(name1);
Console.WriteLine("1");
Console.WriteLine(nameDto1.FirstName + nameDto1.LastName);
Console.WriteLine();
//Console.ReadKey();
//整体设置
//2.整体即时转换
Mapper.Reset();
Name name2 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ConstructUsing(name => new NameDto() { AllName = name.FirstName + name.LastName });
NameDto nameDto2 = Mapper.Map<Name, NameDto>(name2);
Console.WriteLine("2");
Console.WriteLine(nameDto2.AllName);
Console.WriteLine();
//Console.ReadKey();
//3.整体通过TypeConverter类型转换
Mapper.Reset();
Name name3 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ConvertUsing<NameConverter>();
NameDto nameDto3 = Mapper.Map<Name, NameDto>(name3);
Console.WriteLine("3");
Console.WriteLine(nameDto3.AllName);
Console.WriteLine();
//Console.ReadKey();
//单属性设置
//4.属性条件转换
Mapper.Reset();
Name name4 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.FirstName, opt => opt.Condition(name => !name.FirstName.Equals("l", StringComparison.OrdinalIgnoreCase)));
NameDto nameDto4 = Mapper.Map<Name, NameDto>(name4);
Console.WriteLine("4");
Console.WriteLine(string.IsNullOrEmpty(nameDto4.FirstName));
Console.WriteLine();
//Console.ReadKey();
//5.属性忽略
Mapper.Reset();
Name name5 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.FirstName, opt => opt.Ignore());
NameDto nameDto5 = Mapper.Map<Name, NameDto>(name5);
Console.WriteLine("5");
Console.WriteLine(string.IsNullOrEmpty(nameDto5.FirstName));
Console.WriteLine();
//Console.ReadKey();
//6.属性转换
Mapper.Reset();
Name name6 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.AllName, opt => opt.MapFrom(name => name.FirstName + name.LastName));
NameDto nameDto6 = Mapper.Map<Name, NameDto>(name6);
Console.WriteLine("6");
Console.WriteLine(nameDto6.AllName);
Console.WriteLine();
//Console.ReadKey();
//7.属性通过ValueResolver转换
Mapper.Reset();
Name name7 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, StoreDto>()
.ForMember(storeDto => storeDto.Name, opt => opt.ResolveUsing<NameResolver>());
StoreDto store1 = Mapper.Map<Name, StoreDto>(name7);
Console.WriteLine("7");
Console.WriteLine(store1.Name.FirstName + store1.Name.LastName);
Console.WriteLine();
//Console.ReadKey();
//8.属性填充固定值
Mapper.Reset();
Name name8 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.AllName, opt => opt.UseValue<string>("ljzforever"));
NameDto nameDto8 = Mapper.Map<Name, NameDto>(name8);
Console.WriteLine("8");
Console.WriteLine(nameDto8.AllName);
Console.WriteLine();
//Console.ReadKey();
//9.属性格式化
Mapper.Reset();
Name name9 = new Name() { FirstName = "L", LastName = "jz" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.FirstName, opt => opt.AddFormatter<StringFormatter>());
NameDto nameDto9 = Mapper.Map<Name, NameDto>(name9);
Console.WriteLine("9");
Console.WriteLine(nameDto9.FirstName);
Console.WriteLine();
//Console.ReadKey();
//10.属性null时的默认值
Mapper.Reset();
Name name10 = new Name() { FirstName = "L" };
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.LastName, opt => opt.NullSubstitute("jz"));
NameDto nameDto10 = Mapper.Map<Name, NameDto>(name10);
Console.WriteLine("10");
Console.WriteLine(nameDto10.LastName);
Console.WriteLine();
//Console.ReadKey();
//其它设置与特性
//11.转换匿名对象
Mapper.Reset();
object name11 = new { FirstName = "L", LastName = "jz" };
NameDto nameDto11 = Mapper.DynamicMap<NameDto>(name11);
Console.WriteLine("11");
Console.WriteLine(nameDto11.FirstName + nameDto11.LastName);
Console.WriteLine();
//Console.ReadKey();
//12.转换DataTable
Mapper.Reset();
DataTable dt = new DataTable();
dt.Columns.Add("FirstName", typeof(string));
dt.Columns.Add("LastName", typeof(string));
dt.Rows.Add("L", "jz");
List<NameDto> nameDto12 = Mapper.DynamicMap<IDataReader, List<NameDto>>(dt.CreateDataReader());
Console.WriteLine("12");
Console.WriteLine(nameDto12[0].FirstName + nameDto12[0].LastName);
Console.WriteLine();
//Console.ReadKey();
//emitMapper error
//List<NameDto> nameDto20 = EmitMapper.ObjectMapperManager.DefaultInstance.GetMapper<IDataReader, List<NameDto>>().Map(dt.CreateDataReader());
//13.转化存在的对象
Mapper.Reset();
Mapper.CreateMap<Name, NameDto>()
.ForMember(name => name.LastName, opt => opt.Ignore());
Name name13 = new Name() { FirstName = "L" };
NameDto nameDto13 = new NameDto() { LastName = "jz" };
Mapper.Map<Name, NameDto>(name13, nameDto13);
//nameDto13 = Mapper.Map<Name, NameDto>(name13);//注意,必需使用上面的写法,不然nameDto13对象的LastName属性会被覆盖
Console.WriteLine("13");
Console.WriteLine(nameDto13.FirstName + nameDto13.LastName);
Console.WriteLine();
//Console.ReadKey();
//14.Flatten特性
Mapper.Reset();
Mapper.CreateMap<Store, FlattenName>();
Store store2 = new Store() { Name = new Name() { FirstName = "L", LastName = "jz" } };
FlattenName nameDto14 = Mapper.Map<Store, FlattenName>(store2);
Console.WriteLine("14");
Console.WriteLine(nameDto14.NameFirstname + nameDto14.NameLastName);
Console.WriteLine();
//Console.ReadKey();
//15.将Dictionary转化为对象,现在还不支持
Mapper.Reset();
Mapper.CreateMap<Dictionary<string, object>, Name>();
Dictionary<string, object> dict = new Dictionary<string, object>();
dict.Add("FirstName", "L");
//Name name15 = Mapper.DynamicMap<Dictionary<string, object>, Name>(dict);
Name name15 = Mapper.Map<Dictionary<string, object>, Name>(dict);
Console.WriteLine("15");
Console.WriteLine(name15.FirstName);
Console.WriteLine();
Console.ReadKey();
}
}
public class Store
{
public Name Name { get; set; }
public int Age { get; set; }
}
public class Name
{
public string FirstName { get; set; }
public string LastName { get; set; }
}
public class StoreDto
{
public NameDto Name { get; set; }
public int Age { get; set; }
}
public class NameDto
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string AllName { get; set; }
}
public class FlattenName
{
public string NameFirstname { get; set; }
public string NameLastName { get; set; }
}
public class NameConverter : TypeConverter<Name, NameDto>
{
protected override NameDto ConvertCore(Name source)
{
return new NameDto() { AllName = source.FirstName + source.LastName };
}
}
public class NameResolver : ValueResolver<Name, NameDto>
{
protected override NameDto ResolveCore(Name source)
{
return new NameDto() { FirstName = source.FirstName, LastName = source.LastName };
}
}
public class NameFormatter : ValueFormatter<NameDto>
{
protected override string FormatValueCore(NameDto name)
{
return name.FirstName + name.LastName;
}
}
public class StringFormatter : ValueFormatter<string>
{
protected override string FormatValueCore(string name)
{
return name + "-";
}
}
}
比较遗憾的是现在还不支持将Directory转化为对象
参考的文章:
