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OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read, FileShare.Read);
//...
}
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(ofd.FileName, FileMode.Open);
//自己的操作
}