访问对象属性而不转换为类型

Question

i am using LINQ to entity to return a list of objects

            var st = personsList.Select(p => new
            {
                ID = p.Id,
                Key = p.Key,
                Name = p.Name,
                Address = p.Address,
                City = p.City,
                PhoneNumber = p.PhoneNumber
            })
            return st.ToList();

after i get the list in another class how can I access each property?

something like

foreach(object s in St)
{
    string name = s.Name;
}

I have no predefined class to cast the object to it.

Can this be done without having to create a class and cast the object to that class type?

Thanks

Answer 1

Are you using C# 4? You could try using dynamic :

foreach(dynamic s in St)
{
    string name = s.Name;
}

The risk is, of course, that if you try to access a property that the object doesn't have you'll only find out at runtime.

As an aside, wouldn't it make more sense in this case to actually create a class that has all these properties? You clearly need them in several places and you'd get the benefits of type-safety and compile-time errors.

Answer 2

You could use the follwing

foreach(object s in St)
{
   Type type = s.GetType();
   PropertyInfo property = type.GetProperty("Name");
   if(property !=null)
   {
       string name= (string )property.GetValue(s, null);
   }
}

you have to add the namespace System.Reflection to the class

Answer 3

C＃3.0具有允许隐式转换的var类型。

Answer 4

The complier is creating you an anonymous type which can be used within the scope of the method. If you need to pass the results of LINQ query around then it's best to create a domain object to represent that information like PersonSummary and assign the results of the query to that. C# is strongly typed take advantage of that.