如何将属性动态转换为未知的 class 并在 C# Entity Framework 中对其执行检查？

Question

我正在尝试将一系列功能放在一起以供 Entity Framework 使用。我的想法是，我想将通用类全部传递到一个例程中，然后让例程 "type" 为我执行并相应地执行。我似乎无法弄清楚如何将 Class 与其 PropertyType 结合起来。

        public void AddUpdate(string classType, Object o)
    {
        //This gets the Type of my Class Object ok.
        Type mType = Type.GetType(GetType().Namespace + "." + classType, true);

        var meContext = new ClsContext(_ConnectionString);

        //This retrieves the correct primary key for my the Class Object.
        string key = FncGetPrimaryKey(meContext, classType + "s");

        //I've tried this as a PropertyInfo as well instead of a Var
        var keyID = o.GetType().GetProperty(key);

        //I've tried this as Var as well as Dynamic 
        dynamic obj = o;

        //Now I'm stuck, because I want to evaluate the property,
        //but I get an error "<MyClass> does not contain a reference for 'keyID'

        if (obj.keyID == 0) //ERROR ON THIS LINE
        {
            meContext.Entry(o).State = EntityState.Added;
        }
        else
        {
            meContext.Entry(o).State = EntityState.Modified;
        }
        meContext.SaveChanges();
    }

Answer 1

虽然，我不完全明白你为什么要这样，但我想，我明白你想要达到的目的。如果我想添加一些公共对象，我就是这样做的：

public void AddUpdate<T>(T obj) where T : IEntity
{
    using(var ctx = new ClsContext(_ConnectionString))
    {
        if (obj.keyID == 0)
        {
            ctx.Entry(o).State = EntityState.Added;
        }
        else
        {
            ctx.Entry(o).State = EntityState.Modified;
        }
        ctx.SaveChanges();
    }
}

public interface IEntity
{
    int keyId {get;set;}
}

Answer 2

尝试：

var keyValue = keyID.GetValue(o);
if (keyValue.Equals(0)) {...

如何将属性动态转换为未知的 class 并在 C# Entity Framework 中对其执行检查？

How to dynamically cast a property to an unknown class and perform a check on it in C# Entity Framework?

c#

entity-framework-4

system.reflection

如何将 属性 动态转换为未知的 class 并在 C# Entity Framework 中对其执行检查？

How to dynamically cast a property to an unknown class and perform a check on it in C# Entity Framework?

c#

entity-framework-4

system.reflection

如何将属性动态转换为未知的 class 并在 C# Entity Framework 中对其执行检查？