public partial class Form1 : Form{ private Point mouseOffset; // 鼠标位置与图片位置的差值 private Point imageLocation; // 图片的位置 public Form1() { InitializeComponent(); } private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { mouseOffset = new Point(-e.X, -e.Y); imageLocation = pictureBox1.ImageLocation; } } private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { Point mousePos = Control.MousePosition; mousePos.Offset(mouseOffset.X, mouseOffset.Y); pictureBox1.ImageLocation = imageLocation; pictureBox1.ImageLocation = mousePos; } } private void pictureBox1_MouseUp(object sender, MouseEventArgs e) { mouseOffset = Point.Empty; imageLocation = Point.Empty; }}报错了

这段代码的报错信息可能是因为 `pictureBox1` 控件的 `ImageLocation` 属性为只读属性，不能直接对其赋值。你可以尝试修改为 `pictureBox1.Location` 属性来实现鼠标拖动图片的效果。

修改后的代码如下：

public partial class Form1 : Form
{
    private Point mouseOffset;  // 鼠标位置与图片位置的差值    
    private Point imageLocation;  // 图片的位置    

    public Form1()
    {
        InitializeComponent();
    }

    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            mouseOffset = new Point(-e.X, -e.Y);
            imageLocation = pictureBox1.Location;
        }
    }

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
            Point mousePos = Control.MousePosition;
            mousePos.Offset(mouseOffset.X, mouseOffset.Y);
            pictureBox1.Location = mousePos;
        }
    }

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    {
        mouseOffset = Point.Empty;
        imageLocation = Point.Empty;
    }
}

希望这能帮助到你！