CODEWITHSUNDEEP
c#.nettypes
MatrixRonny
MatrixRonny

Reputation: 781

C# DataObject with a Type object as data

I need to pass a Type as data using a DataObject instance. I tried the following code but the result is null.

DataObject data = new DataObject(typeof(String));
Type result = (Type)data.GetData(typeof(Type));  //expected result to be typeof(String)

I am trying to do something like the following, but I am working with Type objects rather than String ones.

DataObject data = new DataObject("abc");
String result = (String)data.GetData(typeof(String));  //the result is "abc"

Any idea why I cannot pass Type objects using DataObject?

--- EDIT1 ---

I am actually using System.Windows.DataObject to figure out why DragEventArgs.Data.GetData method returns null. DragEventArgs.Data is an IDataObject and I use DataObject to simplify my test code.

Upvotes: 0

Views: 2232

Answers (2)

MatrixRonny
MatrixRonny

Reputation: 781

I've found a way to make it working. It also works with DragEventArgs.Data.

DataObject data = new DataObject(typeof(String));
Type result = (Type)data.GetData(typeof(Type).GetType());

It seems that typeof() returns objects of type Type rather than RuntimeType. The only way to get the RuntimeType is to call typeof(ANY_CLASS).GetType(). I used the following code sample to figure this out.

string str1 = new Object().GetType().ToString();  //System.Object
string str2 = typeof(Object).ToString();  //System.Object
string str3 = typeof(Object).GetType().ToString();  //System.RuntimeType
string str4 = typeof(Type).ToString();  //System.Type
string str5 = typeof(Type).GetType().ToString();  //System.RuntimeType

Upvotes: 0

Zohar Peled
Zohar Peled

Reputation: 82474

I think you are looking for generics:

 public class DataObject<T>
 {
      private T _data;
      public DataObject(T data)
      {
          _data = data;
      }

      public T GetData()
      {
          return _data;
      }
 }

Then you can do this:

 var data = new DataObject("abc");
 string result = data.GetData();

Upvotes: 3

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