CODEWITHSUNDEEP
c#clipboardclipboarddata
user4676463
user4676463

Reputation:

Clipboard.GetDataObject() always returns null

I am struggling with using clipboard to copy / paste object, so I created a very simple example to demonstrate the issue.

What is very frustrating is that the same code was working earlier and stopped recently and I am unable to figure out what is wrong.

Basically, the problem is that dataObject.GetData() always returns null even if dataObject.GetDataPresent() returned true earlier.

I am running on .Net 4.5.

using System;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        var a = new TestClass();
        a.Name = "Test";
        a.Index = 1;
        a.Live = true;
        IDataObject dataObj = new DataObject();

        // Method 1 : Not working

        //dataObj.SetData(a);

        // Method 2 : also not working

        DataFormats.Format format = DataFormats.GetFormat(a.GetType().FullName);
        dataObj.SetData(format.Name, false, a);


        Clipboard.SetDataObject(dataObj, false);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        IDataObject dataObject = Clipboard.GetDataObject();

        // Method 1 : Not working

        //if (dataObject.GetDataPresent(typeof(TestClass)))
        //{
        //  // Issue => retrievedObj is ALWAYS null
        //  var retrievedObj = dataObject.GetData(typeof(TestClass));
        //}

        // Method 2 : also not working

        if (dataObject.GetDataPresent(typeof(TestClass).FullName))
        {
            // Issue => retrievedObj is ALWAYS null
            var retrievedObj = dataObject.GetData(typeof(TestClass).FullName);
        }
    }
}

public class TestClass
{
    public string Name;
    public int Index;
    public bool Live;
}
}

Any ideas please ?

Upvotes: 0

Views: 1648

Answers (1)

user4676463
user4676463

Reputation:

I am answering my own question to share my experience.

To keep a long story short, in the original code I wanted to copy / paste an object that was referencing an type (XmlFont, a wrapper type I created to allow serialization of Font type) which was not explicitly marked with Serializable attribute. The funny part though, is that this object was successfully serialized to / from a file using XmlSerializer, so this part is still unclear for me. But marking the XmlFont type as Serializable instantly solved the problem.

Upvotes: 1

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