reportViewer1.PrintDialog()的关闭 触发打印对话框的打印按钮

        public void button1_Click(object sender, EventArgs e)
        {
            Pg();
           

        }
        public void Pg()
        {
            Closed clos = new Closed();
            System.Threading.Thread th = new System.Threading.Thread(new System.Threading.ThreadStart(clos.ClosePrintDialog));
            th.Start();
            reportViewer1.PrintDialog();
            th.Abort();
            clos.Dispose();
                       

        }

 

//closed 窗口的代码

using System.Runtime.InteropServices;

namespace printcode
{
    public partial class Closed : Form
    {
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
        private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, string lParam);

        const int WM_GETTEXT = 0x000D;
        const int WM_SETTEXT = 0x000C;
        const int WM_CLICK = 0x00F5;

        public Closed()
        {
            InitializeComponent();
        }

        private void Closed_Load(object sender, EventArgs e)
        {
            //this.Hide();
          
        }
        public void ClosePrintDialog()
        {
            while (true)
            {
                //下面的这些参数都可以用Spy++查到
                string lpszParentClass = "#32770"; //整个窗口的类名
                string lpszParentWindow = "打印"; //窗口标题
                string lpszClass_Print = "Button"; //需要查找的Button的类名
                string lpszName_Print = "打印(&P)"; //需要查找的Button的标题

                IntPtr ParenthWnd = new IntPtr(0);
                IntPtr ButtonhWnd = new IntPtr(0);

                //查到窗体，得到整个窗体
                ParenthWnd = FindWindow(lpszParentClass, lpszParentWindow);

                //判断这个窗体是否有效
                if (!ParenthWnd.Equals(IntPtr.Zero))
                {
                    //得到Button这个子窗体，并触发它的Click事件
                    ButtonhWnd = FindWindowEx(ParenthWnd, ButtonhWnd, lpszClass_Print, lpszName_Print);
                    if (!ButtonhWnd.Equals(IntPtr.Zero))
                    {
                        SendMessage(ButtonhWnd, WM_CLICK, (IntPtr)0, "0");

                    }
                }
                System.Threading.Thread.Sleep(30);
            }
          
        }

    }
}