[英]Using params keyword with dynamic type arguments
I've declared an interface with Add
method to add new item, 2 classes TopicModel
and CommentModel
to store data. 我已经使用Add
方法声明了一个接口来添加新项目,2个类TopicModel
和CommentModel
来存储数据。
I've re-write the code in console mode, like this: 我在控制台模式下重写代码,如下所示:
interface IAction
{
void Add<T>(params T[] t) where T : class;
}
class TopicModel
{
public string Id { get; set; }
public string Author { get; set; }
}
class CommentModel
{
public string Id { get; set; }
public string Content { get; set; }
}
class Topic : IDisposable, IAction
{
public void Add<T>(params T[] t) where T : class
{
var topic = t[0] as TopicModel;
var comment = t[1] as CommentModel;
// do stuff...
}
public void Dispose()
{
throw new NotImplementedException();
}
}
class MainClass
{
static void Main()
{
var t = new TopicModel { Id = "T101", Author = "Harry" };
var c = new CommentModel { Id = "C101", Content = "Comment 01" };
using (var topic = new Topic())
{
//topic.Add(t, c);
}
}
}
The line topic.Add(t, c)
gave me error message: topic.Add(t, c)
给了我错误信息:
The type arguments for method 'Topic.Add(params T[])' cannot be inferred from the usage. 无法从用法推断出方法'Topic.Add(params T [])'的类型参数。 Try specifying the type arguments explicitly. 尝试显式指定类型参数。
Then, I've tried again with: 然后,我再次尝试:
topic.Add(c, c) // Good :))
topic.Add(t, t, t); // That's okay =))
That's my problem. 那是我的问题。 I want the method accepts 2 different types ( TopicModel
and CommentModel
). 我希望该方法接受2种不同的类型( TopicModel
和CommentModel
)。
And, I don't want to declare: 并且,我不想声明:
interface IAction
{
void Add(TopicModel t, CommentModel c);
}
because another classes can re-use Add
method within different argument types. 因为另一个类可以在不同的参数类型中重用Add
方法。
So, my question is: how to change params T[] t
to accept multiple argument types? 所以,我的问题是:如何更改params T[] t
以接受多个参数类型?
TopicModel et CommentModel must inherit same class Or implement same interface. TopicModel和CommentModel必须继承相同的类或实现相同的接口。 Try This : 尝试这个 :
interface IAction
{
void Add<T>(params T[] t) where T : IModel;
}
class IModel
{
}
class TopicModel : IModel
{
public string Id { get; set; }
public string Author { get; set; }
}
class CommentModel : IModel
{
public string Id { get; set; }
public string Content { get; set; }
}
class Topic : IDisposable, IAction
{
public void Add<T>(params T[] t) where T : IModel
{
var topic = t[0] as TopicModel;
var comment = t[1] as CommentModel;
Console.WriteLine("Topic witch ID={0} added",topic.Id);
Console.WriteLine("Commment witch ID={0} added", comment.Id);
}
public void Dispose()
{
}
}
class Program
{
static void Main()
{
TopicModel t = new TopicModel { Id = "T101", Author = "Harry" };
CommentModel c = new CommentModel { Id = "C101", Content = "Comment 01" };
using (var topic = new Topic())
{
topic.Add<IModel>(t, c);
}
Console.ReadLine();
}
}
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