如何在EF类型名称传递到方法的参数？ [英] How to pass in EF Type names into method arguments?

问题描述

我使用MVC3，EF4.1和C＃。

I am using MVC3, EF4.1 and C#.

我想使用一个通用的方法来更新它存在于众多的实体类型的属性。因此，我需要在类型传递到方法作为参数。我怎么能这样做吗？

I am trying to use a generic method to update a property which exists in numerous Entity Types. Therefore I need to pass in the Type into the method as an argument. How can I do this please?

有些code：

    public Boolean CompleteTask()
    {
        PRV myCurrentRecord = db.Task.OfType<PRV>().Single(r => r.Id == myId);
        myCurrentRecord.IsComplete = true;
        if (db.SaveChanges() > 0)
            return true;
        else return false;
    }

在上面的例子中PRV是硬codeD。我想在不同类型的都有IsComplete作为一个属性来传递。

In the above example "PRV" is "hardcoded". I would like to pass in different types that all have "IsComplete" as a property.

我使用的TPH继承和刚刚意识到，我可以只使用父实体，即：

I am using TPH inheritance, and have just realised that I can just use the parent entity, ie:

Parent.IsComplete

有兴趣，但是，知道一在一个类型的通行证。

Would be interested, however, to know how one passes in a type.

感谢。

推荐答案

您可以使用的这个泛型方法：

public Boolean CompleteTask<TEntity>()
{
    TEntity myCurrentRecord = db.Task.OfType<TEntity>().Single(r => r.Id == myId);
    myCurrentRecord.IsComplete = true;
    if (db.SaveChanges() > 0)
        return true;
    else return false;
}

您必须添加一个类型约束为 TEntity ，以确保它有一个 IsComplete 属性。

You have to add a type constraint for TEntity to make sure it derives from your parent type which has an IsComplete property.

public Boolean CompleteTask<TEntity>() where TEntity : ParentType
{
    ...
}

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