解决“System.Threading.ThreadStateException:“在可以调用 OLE 之前，必须将当前线程设置为单线程单元(STA)模式。请确保您的 Main 函数带有 STAThreadAttribute 标记。 只有将调试程序附加到该进程才会引发此异常”的异常

解决方法：

添加如下：

 

代码：

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Thread t = new Thread((ThreadStart)(() =>                 {                     SaveFileDialog saveqrimg = new SaveFileDialog();                           saveqrimg.Title = "二维码图片保存";                     saveqrimg.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";                     if (saveqrimg.ShowDialog() == DialogResult.OK)                     {                         this.pictureBox1.Image.Save(saveqrimg.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);                         MessageBox.Show("保存成功！");                     }                     //else if(saveqrimg.ShowDialog() == DialogResult.Cancel)                     //{                     //    MessageBox.Show("已取消保存！");                     //}                     else                     {                         MessageBox.Show("保存失败！");                     }                 }                 ));                 t.SetApartmentState(ApartmentState.STA);                 t.Start();                 t.Join();