如何将图像从 Stream 对象保存到选定的路径

Question

以下代码提示用户选择保存图片框中图像的路径：

        Stream myStream;
        SaveFileDialog saveFileDialog1 = new SaveFileDialog();            
        saveFileDialog1.Filter = "Portable Network Graphics|*.png";
        saveFileDialog1.Title = "Bild speichern";
        saveFileDialog1.RestoreDirectory = true;
        saveFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            if ((myStream = saveFileDialog1.OpenFile()) != null)
            {
                this.picBox.Image.Save(myStream.ToString()); // is not getting the selected path
                myStream.Close();
            }
        }

但是如何从 myStream 获取路径或将图像保存到用户定义的位置（与 .NET 3.5 兼容）？

Answer 1

如果您想从保存对话框中获取选定的文件路径，请使用...

saveFileDialog1.FileName;

请参阅 此处 了解有关此属性的更多信息

您无需担心是否使用 Stream 来完成此任务。

需要明确的是，您的代码应该是这样的......

SaveFileDialog saveFileDialog1 = new SaveFileDialog();            
saveFileDialog1.Filter = "Portable Network Graphics|*.png";
saveFileDialog1.Title = "Bild speichern";
saveFileDialog1.RestoreDirectory = true;
saveFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
    this.picBox.Image.Save(saveFileDialog1.FileName);
}

Answer 2

您可以仅使用 SaveFileDialog.FileName，不需要单独的流，请尝试以下操作：

using (var saveFileDialog1 = new SaveFileDialog())
{
    saveFileDialog1.Filter = "Portable Network Graphics|*.png";
    saveFileDialog1.Title = "Bild speichern";
    saveFileDialog1.RestoreDirectory = true;
    saveFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

    if (saveFileDialog1.ShowDialog() == DialogResult.OK)
    {
        picBox.Image.Save(saveFileDialog1.FileName);
    }
}

Answer 3

您可以使用：

string path = Path.GetDirectory(saveFileDialog1.Filename);
this.picBox.Image.Save(saveFileDialog1.Filename);

您真的不需要流来做到这一点:)

Answer 4

这怎么样？

SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Filter = "Portable Network Graphics|*.png";
saveFileDialog1.Title = "Bild speichern";
saveFileDialog1.RestoreDirectory = true;
saveFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
    (using FileStream fStr = new FileStream(saveFileDialog1.FileName, FileMode.Create))
    {
        this.picBox.Image.Save(fStr);
        fStr.Close();
    }
}