扩展默认实体框架模型类以包含自定义类

发布于 2024-10-21 23:17:53 字数 1431 浏览 1 评论 0原文

我有一个实体模型，其中添加了一些从我的数据库中添加的表。我想包含一个自定义类，它将充当数据模型并返回自定义数据。这就是我想要做的：

// My custom data model
public class DataModel
{
    var dbContext = new ODataDemoEntities();

    Employees = from e in dbContext.Employee
                select new EmployeeModel
                {
                    ID = e.EmployeeID,
                    FirstName = e.FirstName,
                    LastName = e.LastName
                };

    public IQueryable<EmployeeModel> Employees { get; private set; }
}

// My custom class
[DataServiceKey("ID")]
public class EmployeeModel
{
    /// <summary>ID of the employee.</summary>
    public int ID { get; set; }

    /// <summary>First name of the employee.</summary>
    public string FirstName { get; set; }

    /// <summary>Last name of the employee.</summary>
    public string LastName { get; set; }
}

// My WCF Data Service Code
public class EmployeeDataService : DataService<DataModel>
{
    // This method is called only once to initialize service-wide policies.
    public static void InitializeService(DataServiceConfiguration config)
    {
        config.SetEntitySetAccessRule("Employees", EntitySetRights.AllRead);
        config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
    }
}

但是我想在我现有的实体数据模型类中包含这个Employees类，这样我就可以扩展现有的数据模型以包含我的自定义类（EmployeesModel），而不是使用不同的数据模型创建单独的服务）也。

原文

I have an entity model which has some tables added from my DB. I want to include a custom class which will act as a data model and will return customized data. Here is what I am trying to do:

// My custom data model
public class DataModel
{
    var dbContext = new ODataDemoEntities();

    Employees = from e in dbContext.Employee
                select new EmployeeModel
                {
                    ID = e.EmployeeID,
                    FirstName = e.FirstName,
                    LastName = e.LastName
                };

    public IQueryable<EmployeeModel> Employees { get; private set; }
}

// My custom class
[DataServiceKey("ID")]
public class EmployeeModel
{
    /// <summary>ID of the employee.</summary>
    public int ID { get; set; }

    /// <summary>First name of the employee.</summary>
    public string FirstName { get; set; }

    /// <summary>Last name of the employee.</summary>
    public string LastName { get; set; }
}

// My WCF Data Service Code
public class EmployeeDataService : DataService<DataModel>
{
    // This method is called only once to initialize service-wide policies.
    public static void InitializeService(DataServiceConfiguration config)
    {
        config.SetEntitySetAccessRule("Employees", EntitySetRights.AllRead);
        config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
    }
}

However I want to include this Employees class in my existing entity data model class, so that rather than creating separate service with different data model, I extend my existing data model to include my custom class (EmployeesModel) too.

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