未引发 DragDrop 事件

发布于 2024-09-30 21:13:40 字数 1117 浏览 6 评论 0 原文

这是一个愚蠢的问题...我正在尝试将图片框拖放到面板上。我遵循了一些例子，但它不起作用。面板的 DragDrop 事件永远不会引发。我在这个网站上搜索了解决方案，发现了两个已有一年多的主题，但他们的解决方案不起作用。我创建了一个新项目，仅包含以下代码：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            pictureBox1.MouseDown += new MouseEventHandler(pictureBox1_MouseDown);
            panel1.DragDrop +=new DragEventHandler(panel1_DragDrop);
            panel1.DragOver +=new DragEventHandler(panel1_DragOver);
        }

        private void panel1_DragOver(object sender, DragEventArgs e)
        {
            Console.WriteLine("DragOver");
        }

        private void panel1_DragDrop(object sender, DragEventArgs e)
        {
            Console.WriteLine("DragDrop");
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Console.WriteLine("Mouse");
            pictureBox1.DoDragDrop(pictureBox1.Text, DragDropEffects.All);
        }
    }

我还将面板和表单的AllowDrop设置为true。 DragOver 和 MouseDown 被抬起。另外，当我拖动图片框时，光标会变成带圆圈的，就像这是不允许的操作一样。有没有办法让光标变成图片框中的图像？我不想移动图片框，只想向面板添加一个项目。

原文

This is kind of a stupid question... I'm trying to drag and drop a picturebox onto a panel. I followed some exemples, but it doesn't work. The DragDrop event of the panel is never raised. I searched thi site for a solution andfound two topics over a year old, but their solutions did not work. I created a new project, with only this code :

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            pictureBox1.MouseDown += new MouseEventHandler(pictureBox1_MouseDown);
            panel1.DragDrop +=new DragEventHandler(panel1_DragDrop);
            panel1.DragOver +=new DragEventHandler(panel1_DragOver);
        }

        private void panel1_DragOver(object sender, DragEventArgs e)
        {
            Console.WriteLine("DragOver");
        }

        private void panel1_DragDrop(object sender, DragEventArgs e)
        {
            Console.WriteLine("DragDrop");
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Console.WriteLine("Mouse");
            pictureBox1.DoDragDrop(pictureBox1.Text, DragDropEffects.All);
        }
    }

I also set the AllowDrop of the panel and the form to true. DragOver and MouseDown are raised. Also, when I drag the picturebox, the cursor become a barred circled, like it was an operation that wasn't allowed. Is there a way that the cursor becomes the image in the picture box? I don't want the picturebox to move, only to add an item to the panel.

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耀眼的星火 2024-10-07 21:13:40

问题很容易解决。

您必须在 DragEnter 中设置适当的 Effect：

private void Form1_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.All;
}

之后，DragDrop 事件才能正确触发。

The problem is easy to solve.

You must just set in DragEnter appropriate Effect:

private void Form1_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.All;
}

After that DragDrop event is fired correctly.

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木有鱼丸 2024-10-07 21:13:40

理查德，问题是拖放操作并不像您在此处编写的代码那么简单。这里您还没有开始拖动运动，应该从代码开始，您可以在此处阅读更多相关信息... http://msdn.microsoft.com/en-us/library/system.windows.forms.control.dodragdrop(v= VS.90).aspx

如果您只想移动 PictureBox... 在运行时将图片框拖到winform中

最后在同一 Windows 窗体应用程序的实例之间拖放

希望这会有所帮助。