Dynamic ContentView with Parameters

Question

Hi,

I am opening a ContentView dynamically like this:

var targetPageType = Type.GetType("MyApp." + page_code);
post_details = (ContentView)Activator.CreateInstance(targetPageType);

I want to ask what if my ContentView has a parameter, for example:

MyView(string id)

and I want to pass it using the same above code because the MyView is populating from my database

Thanks
Jassim

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

I want to ask what if my ContentView has a parameter

Yes, you can add parameter like following code. Add new constructor with one parameter.

   public partial class MyCustomEntry : ContentView  
       {  
           public MyCustomEntry()  
           {  
               InitializeComponent();  
           }  
           public MyCustomEntry(int id)  
           {  
               InitializeComponent();  
           }  
   }  

Then, if you opening a ContentView dynamically like following code. For example, My project called ImageLongClickDemo, the custom contentview called MyCustomEntry, then I need transfer 1 as parameter, add the parameter in the end of the targetPageType.

   var targetPageType = Type.GetType("ImageLongClickDemo." + "MyCustomEntry");  
               ContentView post_details = (ContentView)Activator.CreateInstance(targetPageType,1);  

Best Regards,

Leon Lu

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Answer 2

Do you mean you have a MyView class and you want to check if it has a constructor that accepts string id? If so you can just use the Type.GetConstructor method to find a constructor that has that type signature, then an additional check to make sure it has the correct type & name, then if it's the correct type we .Invoke() it with the parameter to create it:

var type = typeof(MyView);
var ctor = type.GetConstructor(new[] { typeof(string) });

if (ctor != null && ctor.GetParameters().Any(p => p.Name == "id" && p.ParameterType == typeof(string))) {
    var instance = (ContentView)ctor.Invoke(new[] { "test_value" });
}

abstract class ContentView { }

class MyView : ContentView {
    public MyView(string id) {
    }
}

Apologies if I've misunderstood your query.