Question

我使用的是C＃窗体。

我的代码：

private void Openbutton_Click(object sender, EventArgs e)
{
        OpenFileDialog openFileDialog = new OpenFileDialog();
        if (openFileDialog.ShowDialog() == DialogResult.OK)
        {
            SurveyDiagrampictureBox.Image = Bitmap.FromFile(openFileDialog.FileName);

            MemoryStream memoryStream = new MemoryStream();
            SurveyDiagrampictureBox.Image.Save(memoryStream, ImageFormat.Jpeg);
            SurveyDiagram = memoryStream.GetBuffer();
        }
}

并不总是会发生，踩到这一行时会抛出异常：SurveyDiagrampictureBox.Image.Save(memoryStream, ImageFormat.Jpeg);

异常消息：

未处理的类型异常   发生'System.Runtime.InteropServices.ExternalException'   System.Drawing.dll程序

其他信息：GDI +中发生了一般性错误。

Answer 1

GDI +位图不是线程安全的，因此这些错误通常来自在多个线程上访问的图像。看起来这可能发生在这里（例如，PictureBox渲染图像，图像保存在按钮点击处理程序线程上）。

完成保存操作后，如何将Bitmap分配给PictureBox？

private void Openbutton_Click(object sender, EventArgs e)
{
        OpenFileDialog openFileDialog = new OpenFileDialog();
        if (openFileDialog.ShowDialog() == DialogResult.OK)
        {
            Image img = Bitmap.FromFile(openFileDialog.FileName);

            MemoryStream memoryStream = new MemoryStream();
            img.Save(memoryStream, ImageFormat.Jpeg);
            SurveyDiagram = memoryStream.GetBuffer();

            SurveyDiagrampictureBox.Image = img;
        }
}

尝试将图像保存到MemoryStream时，GDI +异常中发生了一般错误

1 个答案: