Thread: Drag and Drop code (please help me fix)

  1. #1
    Registered User
    Join Date
    Sep 2007

    Drag and Drop code (please help me fix)

    I don't have any idea what's wrong with this code. Can someone please help fix it, I have my entire form set to "Allow Drop = true". So i should just be able to drag a list view item anywhere and have the information displayed in the text boxes. Nothing happens when clicking a list view item and dragging it.

    Form Layout:

    ListView control on the left side with 5 names, 5 text boxes on the right side with labels corresponding to them. When a list view item is clicked and dragged anywhere on the form, their information should be displayed in the proper text boxes.

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    namespace Part_B
        public partial class Form1 : Form
            const int ASCIIO = 48;
            private struct people
                public string fName;
                public string lName;
                public string number;
                public string years;
                public string degree;
            private people[] list = new people[5];
            public Form1()
                list[0].fName = "John";
                list[0].lName = "Doe";
                list[0].number = "245-9087";
                list[0].years = "4";
                list[0].degree = "Computer Science";
                list[1].fName = "Jane";
                list[1].lName = "Smith";
                list[1].number = "222-2222";
                list[1].years = "1";
                list[1].degree = "Arts";
                list[2].fName = "Mike";
                list[2].lName = "Butler";
                list[2].number = "802-1233";
                list[2].years = "4";
                list[2].degree = "Economics";
                list[3].fName = "Alan";
                list[3].lName = "Kay";
                list[3].number = "455-3939";
                list[3].years = "3";
                list[3].degree = "Phsycology";
                list[4].fName = "Jill";
                list[4].lName = "Jacobs";
                list[4].number = "285-3944";
                list[4].years = "2";
                list[4].degree = "Computer Sciece";
            private void listView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
                listView1.DoDragDrop(listView1.FocusedItem.Index.ToString(), DragDropEffects.Copy);
            private void Form1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
                if (e.Data.GetDataPresent(typeof(string)))
                    e.Effect = DragDropEffects.Copy;
            private void Form1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
                int index = ((int)e.Data.GetData(DataFormats.Text).ToString()[0]) - ASCIIO;
                fName.Text = list[index].fName;
                lName.Text = list[index].lName;
                pNumber.Text = list[index].number;
                yCollege.Text = list[index].years;
                Degree.Text = list[index].degree;
            private void Form_Load(object sender, EventArgs e)
            private void panel1_Paint(object sender, PaintEventArgs e)

  2. #2
    Confused Magos's Avatar
    Join Date
    Sep 2001
    I'm sure setting the form AllowDrop doesn't allow dropping in its subcontrols, only the form itself. You have to set the flag for all controls that should accept the dragged "files".

    When dragging an item, does the cursor change at all (so you know if ItemDrag and DoDragDrop works for you)?

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

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