Question

考虑以下表述:

from p in db.People
    select new Person {
        Name = p.Name, Age = p.Age, Gender = p.Gender.ToEnum<Gender>()
};

It works to the point of calling extension method static T ToEnum<T>(this string value); as expected.
I understand why there is do not know how to translate string to enum error.
Question is: how do I work around this without introducing another class?
I mean that I could define class PersonWithGenderAsText and then translate that into Person class, but I feel there got to be an easier way.
Specifically, I don t mind calling .ToList() on the result of the expression above, but I cant figure out the rest.

Answer 1

仅使用匿名内身打字,仅指你希望从数据库中提取的比照,使用可折成“在过程”方式,并then 您可做转换成个人物体:

var query = db.People
              .Select(p => new { p.Name, p.Age, p.Gender } )
              .AsEnumerable()
              .Select(p => new Person { Name = p.Name,
                                        Age = p.Age,
                                        Gender = p.Gender.ToEnum<Gender>() } );

如果在<代码>db.People上没有其他数据,你可以进一步简化:

var query = db.People
              .AsEnumerable()
              .Select(p => new Person { Name = p.Name,
                                        Age = p.Age,
                                        Gender = p.Gender.ToEnum<Gender>() } );

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