图片库中未加载位图

Question

我无法在PictureBox中加载位图图像。 它给我一个错误，指出参数无效。

        Image up = Image.FromFile("somePath");
        Image down = Image.FromFile("anotherPath");

        using (down)
        {
            using(var bmp = new Bitmap(1000, 1000))
            {
                using(var canvas = Graphics.FromImage(bmp))
                {
                    canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    canvas.DrawImage(up, 0, 0);
                    canvas.DrawImage(down, 0, 500);
                    canvas.Save();
                    pictureBox1.Image = bmp;// this line gives the error
                } 
            }
        }

我的pictureBox的大小也是1000X1000。 谁能告诉我我要去哪里错了？

编辑1：错误说明：

System.ArgumentException：参数无效。 在系统System.Windows.Forms.PictureBox.ImageRectangleFromSizeMode（PictureBoxSizeMode模式）在System.Windows.Forms.PictureBox.OnPaint（PaintEventArgs pe）在System.Windows.Forms.PictureBox.ImageRectangleFromSizeMode（PictureBoxSizeMode模式）在System.Drawing.Image.get_Size（）在System.Windows.Forms.Control.WmPaint（Message＆m）（位于System.Windows.Forms的System.Windows.Forms.Control.WmProint（Message＆m））处的.Windows.Forms.Control.PaintWithErrorHandling（PaintEventArgs e，Int16层） System.Windows.Forms上的Control.ControlNativeWindow.OnMessage（Message＆m）System.Windows.Forms.NativeWindow.Callback上的Control.ControlNativeWindow.WndProc（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）

Answer 1

删除bmp上的using语句。 因为，您的位图被放置在pictureBox1.Image = bmp;之后pictureBox1.Image = bmp; 并且您在绘画事件上收到错误消息。

Image up = Image.FromFile("somePath");
Image down = Image.FromFile("anotherPath");

using (down)
{
    var bmp = new Bitmap(1000, 1000);
    using(var canvas = Graphics.FromImage(bmp))
    {
        canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
        canvas.DrawImage(up, 0, 0);
        canvas.DrawImage(down, 0, 500);
        canvas.Save();
        pictureBox1.Image = bmp;// this line gives the error
    } 
 }