應用場景

解決方案

思路
1.設定關閉列印進度視窗，此視窗會一直置頂，而且取消按鈕失效
2.列印前開啟執行緒進行輪詢獲取列印程序
3.根據程序獲取視窗控制代碼，設定視窗位置為最前
4.結束輪詢
實現
1.關閉列印進度視窗
設定ShowProgress為false，具體參考http://blog.csdn.net/yijunwanghaha/article/details/60761033
2.啟動輪詢
據觀察，當彈出檔案另存為視窗時，系統會多出名為splwow64的程序，我們可以通過此程序實現置頂功能，但是由於我們不知道使用者何時點選window系統的列印按鈕，所以需要在程式執行FastReport列印前啟動一個輪詢，獲取程序，實現視窗置頂功能

// 列印是否完成
static bool isPrintCompleted = false;
// 設定視窗置頂
private static void SetWindowTop()
{
	Task.Run(() =>
	{
		// 非同步輪詢實現視窗置頂
		while (!isPrintCompleted)
		{
			// 獲取視窗置頂
			isPrintCompleted = WindowClass.SetWindowTop();
			Thread.Sleep(100);
		}
	});
}

string processName = "splwow64";
Process[] processes = Process.GetProcesses();
foreach (Process process in processes)
{
	if (process.ProcessName == processName)
	{
		// 根據程序Id獲取程序視窗控制代碼
		IntPtr intPtr = process.MainWindowHandle;
		while (intPtr == IntPtr.Zero) // 這裡要判斷控制代碼為0的情況，只有彈出另存為窗口才會有值
		{
			Thread.Sleep(100);
			// 重新獲取控制代碼
			intPtr = process.MainWindowHandle;
		}
	}
}
 

引用user32函式 
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
[DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
public static extern IntPtr SetForegroundWindow(IntPtr hwnd);
[DllImport("user32.dll", EntryPoint = "ShowWindow", CharSet = CharSet.Auto)]
public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
// 恢復原來視窗，並觸發視窗
public const int SW_RESTORE = 9;
實現
// 顯示視窗
ShowWindow(intPtr, SW_RESTORE);
// 視窗置頂
SetWindowPos(intPtr, -1, 0, 0, 0, 0, 1 | 2);
SetForegroundWindow(intPtr);

Internal calss PrintClass
{
	// 列印是否完成
	static bool isPrintCompleted = false;
	private static void SetWindowTop()
	{
		Task.Run(() =>
		{
		// 非同步輪詢獲取視窗置頂
		while (!isPrintCompleted)
		{
			// 獲取視窗置頂
			isPrintCompleted = WindowClass.WindowPos();
			Thread.Sleep(100);
		}
		});
	}

	public static void Print()
	{
		isPrintCompleted = false;
		SetWindowTop()
		r.PrintPrepared();
		r.Print();
		isPrintCompleted = true;
	}
}

internal class WindowClass
{
	private static readonly ILog Logger = LogManager.GetLogger(typeof(PrintHelper));
	// 該函式改變一個子視窗,彈出式視窗式頂層視窗的尺寸,位置和Z序
	[DllImport("user32.dll", CharSet = CharSet.Auto)]
	private static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
	// 該函式將建立指定視窗的執行緒設定到前臺,並且啟用該視窗
	[DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
	public static extern IntPtr SetForegroundWindow(IntPtr hwnd);
	[DllImport("user32.dll", EntryPoint = "ShowWindow", CharSet = CharSet.Auto)]
	public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
	// 恢復原來視窗，並觸發視窗
	public const int SW_RESTORE = 9;
	/// <summary>
	/// 設定列印視窗置頂
	/// </summary>
	/// <returns></returns>
	public static bool SetWindowTop()
	{
	try
	{
		// 程序名稱
		string processName = "splwow64";
		Process[] processes = Process.GetProcesses();
		foreach (Process process in processes)
		{
			if (process.ProcessName == processName)
			{
				// 根據程序Id獲取程序視窗控制代碼
				IntPtr intPtr = process.MainWindowHandle;
				while (intPtr == IntPtr.Zero)
				{
					Thread.Sleep(100);
					// 重新獲取控制代碼
					intPtr = process.MainWindowHandle;
				}
				// 顯示視窗(有時視窗被最小化/隱藏)
				ShowWindow(intPtr, SW_RESTORE);
				// 更改視窗的Zorder，SetWindowPos使之最上
				SetWindowPos(intPtr, -1, 0, 0, 0, 0, 1 | 2);
				// 置頂啟用
				SetForegroundWindow(intPtr);
				return true;
			}
		}
	}
	catch (Exception ex) { Logger.Info(ex.ToString()); }
	return false;
	}
}

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