将匿名类型转换为类

我在List anBook中有一个匿名类型:

var anBook=new []{

new {Code=10, Book ="Harry Potter"},
new {Code=11, Book="James Bond"}
};

是否可以将其转换为具有以下clearBook定义的List:

public class ClearBook
{
  int Code;
  string Book; 
}

通过使用直接转换,即不通过书籍循环？

好吧,你可以使用:

var list = anBook.Select(x => new ClearBook {
               Code = x.Code, Book = x.Book}).ToList();

但不,没有直接转换支持.显然你需要添加访问器等(不要公开字段) - 我猜:

public int Code { get; set; }
public string Book { get; set; }

当然,另一种选择是从数据开始,如何:

var list = new List {
    new ClearBook { Code=10, Book="Harry Potter" },
    new ClearBook { Code=11, Book="James Bond" }
};

您还可以使用反射来映射数据(可能使用Expression编译和缓存策略),但它可能不值得.

正如Marc所说,它可以用反射和表达树完成......而且幸运的是,MiscUtil中有一个类就是这样.但是,更仔细地查看您的问题听起来您希望将此转换应用于集合(数组,列表或其他)而不进行循环.那不可能奏效.您正在从一种类型转换为另一种类型 - 它不像您可以使用对匿名类型的引用,就好像它是对ClearBook的引用一样.

要举例说明PropertyCopy类是如何工作的,您只需要:

var books = anBook.Select(book => PropertyCopy.CopyFrom(book))
                                 .ToList();

这些扩展怎么样？简单地在你的匿名类型上调用.ToNonAnonymousList ..

public static object ToNonAnonymousList(this List list, Type t)
    {
        //define system Type representing List of objects of T type:
        Type genericType = typeof (List<>).MakeGenericType(t);

        //create an object instance of defined type:
        object l = Activator.CreateInstance(genericType);

        //get method Add from from the list:
        MethodInfo addMethod = l.GetType().GetMethod("Add");

        //loop through the calling list:
        foreach (T item in list)
        {
            //convert each object of the list into T object by calling extension ToType()
            //Add this object to newly created list:
            addMethod.Invoke(l, new[] {item.ToType(t)});
        }
        //return List of T objects:
        return l;
    }
    public static object ToType(this object obj, T type)
    {
        //create instance of T type object:
        object tmp = Activator.CreateInstance(Type.GetType(type.ToString()));

        //loop through the properties of the object you want to covert:          
        foreach (PropertyInfo pi in obj.GetType().GetProperties())
        {
            try
            {
                //get the value of property and try to assign it to the property of T type object:
                tmp.GetType().GetProperty(pi.Name).SetValue(tmp, pi.GetValue(obj, null), null);
            }
            catch (Exception ex)
            {
                Logging.Log.Error(ex);
            }
        }
        //return the T type object:         
        return tmp;
    }