调用Excel导出文件的两种方式，主要解决了资源释放的问题。

/******************************** Module Header ********************************\
* Module Name:  Solution2.cs
* Project:      CSAutomateExcel
* Copyright (c) Microsoft Corporation.
*
* Solution2.AutomateExcel demonstrates automating Microsoft Excel application by
* using Microsoft Excel Primary Interop Assembly (PIA) and forcing a garbage
* collection as soon as the automation function is off the stack (at which point
* the Runtime Callable Wrapper (RCW) objects are no longer rooted) to clean up
* RCWs and release COM objects.
*
* This source is subject to the Microsoft Public License.
* See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL. * All other rights reserved.
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
* EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
\*******************************************************************************/

#region Using directives
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;

using Excel = Microsoft.Office.Interop.Excel;
#endregion

namespace CSAutomateExcel
{
static class Solution2
{
public static void AutomateExcel()
{
AutomateExcelImpl();

// Clean up the unmanaged Excel COM resources by forcing a garbage
// collection as soon as the calling function is off the stack (at
// which point these objects are no longer rooted).

GC.Collect();
GC.WaitForPendingFinalizers();
// GC needs to be called twice in order to get the Finalizers called
// - the first time in, it simply makes a list of what is to be
// finalized, the second time in, it actually is finalizing. Only
// then will the object do its automatic ReleaseComObject.
GC.Collect();
GC.WaitForPendingFinalizers();
}

private static void AutomateExcelImpl()
{
object missing = Type.Missing;

try
{
// Create an instance of Microsoft Excel and make it invisible.

Excel.Application oXL = new Excel.Application();
oXL.Visible = false;
Console.WriteLine("Excel.Application is started");

// Create a new Workbook.

Excel.Workbook oWB = oXL.Workbooks.Add(missing);
Console.WriteLine("A new workbook is created");

// Get the active Worksheet and set its name.

Excel.Worksheet oSheet = oWB.ActiveSheet as Excel.Worksheet;
oSheet.Name = "Report";
Console.WriteLine("The active worksheet is renamed as Report");

// Fill data into the worksheet's cells.

Console.WriteLine("Filling data into the worksheet ...");

// Set the column header
oSheet.Cells[1, 1] = "First Name";
oSheet.Cells[1, 2] = "Last Name";
oSheet.Cells[1, 3] = "Full Name";

// Construct an array of user names
string[,] saNames = new string[,] {
{"John", "Smith"},
{"Tom", "Brown"},
{"Sue", "Thomas"},
{"Jane", "Jones"},
{"Adam", "Johnson"}};

// Fill A2:B6 with an array of values (First and Last Names).
oSheet.get_Range("A2", "B6").Value2 = saNames;

// Fill C2:C6 with a relative formula (=A2 & " " & B2).
oSheet.get_Range("C2", "C6").Formula = "=A2 & \" \" & B2";

// Save the workbook as a xlsx file and close it.

Console.WriteLine("Save and close the workbook");

string fileName = Path.GetDirectoryName(
Assembly.GetExecutingAssembly().Location) + "\\Sample2.xlsx";
oWB.SaveAs(fileName, Excel.XlFileFormat.xlOpenXMLWorkbook,
missing, missing, missing, missing,
Excel.XlSaveAsAccessMode.xlNoChange,
missing, missing, missing, missing, missing);
oWB.Close(missing, missing, missing);

// Quit the Excel application.

Console.WriteLine("Quit the Excel application");

// Excel will stick around after Quit if it is not under user
// control and there are outstanding references. When Excel is
// started or attached programmatically and
// Application.Visible = false, Application.UserControl is false.
// The UserControl property can be explicitly set to True which
// should force the application to terminate when Quit is called,
// regardless of outstanding references.
oXL.UserControl = true;

oXL.Quit();
}
catch (Exception ex)
{
Console.WriteLine("Solution2.AutomateExcel throws the error: {0}",
ex.Message);
}
}
}
}

/******************************** Module Header ********************************\
* Module Name:  Solution1.cs
* Project:      CSAutomateExcel
* Copyright (c) Microsoft Corporation.
*
* Solution1.AutomateExcel demonstrates automating Microsoft Excel application by
* using Microsoft Excel Primary Interop Assembly (PIA) and explicitly assigning
* each COM accessor object to a new varaible that you would explicitly call
* Marshal.FinalReleaseComObject to release it at the end. When you use this
* solution, it is important to avoid calls that tunnel into the object model
* because they will orphan Runtime Callable Wrapper (RCW) on the heap that you
* will not be able to access in order to call Marshal.ReleaseComObject. You need
* to be very careful. For example,
*
*   Excel.Workbook oWB = oXL.Workbooks.Add(missing);
*
* Calling oXL.Workbooks.Add creates an RCW for the Workbooks object. If you
* invoke these accessors via tunneling as this code does, the RCW for Workbooks
* is created on the GC heap, but the reference is created under the hood on the
* stack and are then discarded. As such, there is no way to call
* MarshalFinalReleaseComObject on this RCW. To get such kind of RCWs released,
* you would either need to force a garbage collection as soon as the calling
* function is off the stack (see Solution2.AutomateExcel), or you would need to
* explicitly assign each accessor object to a variable and free it.
*
*   Excel.Workbooks oWBs = oXL.Workbooks;
*   Excel.Workbook oWB = oWBs.Add(missing);
*
* This source is subject to the Microsoft Public License.
* See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL. * All other rights reserved.
*
* THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
* EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
\*******************************************************************************/

#region Using directives
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;

using Excel = Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
#endregion

namespace CSAutomateExcel
{
static class Solution1
{
public static void AutomateExcel()
{
object missing = Type.Missing;
Excel.Application oXL = null;
Excel.Workbooks oWBs = null;
Excel.Workbook oWB = null;
Excel.Worksheet oSheet = null;
Excel.Range oCells = null;
Excel.Range oRng1 = null;
Excel.Range oRng2 = null;

try
{
// Create an instance of Microsoft Excel and make it invisible.

oXL = new Excel.Application();
oXL.Visible = false;
Console.WriteLine("Excel.Application is started");

// Create a new Workbook.

oWBs = oXL.Workbooks;
oWB = oWBs.Add(missing);
Console.WriteLine("A new workbook is created");

// Get the active Worksheet and set its name.
oSheet = oWB.ActiveSheet as Excel.Worksheet;
oSheet.Name = "Report";
Console.WriteLine("The active worksheet is renamed as Report");

// Fill data into the worksheet's cells.

Console.WriteLine("Filling data into the worksheet ...");

// Set the column header
oCells = oSheet.Cells;
oCells[1, 1] = "First Name";
oCells[1, 2] = "Last Name";
oCells[1, 3] = "Full Name";

// Construct an array of user names
string[,] saNames = new string[,] {
{"John", "Smith"},
{"Tom", "Brown"},
{"Sue", "Thomas"},
{"Jane", "Jones"},
{"Adam", "Johnson"}};

// Fill A2:B6 with an array of values (First and Last Names).
oRng1 = oSheet.get_Range("A2", "B6");
oRng1.Value2 = saNames;

// Fill C2:C6 with a relative formula (=A2 & " " & B2).
oRng2 = oSheet.get_Range("C2", "C6");
oRng2.Formula = "=A2 & \" \" & B2";

// Save the workbook as a xlsx file and close it.

Console.WriteLine("Save and close the workbook");

string fileName = Path.GetDirectoryName(
Assembly.GetExecutingAssembly().Location) + "\\Sample1.xlsx";
oWB.SaveAs(fileName, Excel.XlFileFormat.xlOpenXMLWorkbook,
missing, missing, missing, missing,
Excel.XlSaveAsAccessMode.xlNoChange,
missing, missing, missing, missing, missing);
oWB.Close(missing, missing, missing);

// Quit the Excel application.

Console.WriteLine("Quit the Excel application");

// Excel will stick around after Quit if it is not under user
// control and there are outstanding references. When Excel is
// started or attached programmatically and
// Application.Visible = false, Application.UserControl is false.
// The UserControl property can be explicitly set to True which
// should force the application to terminate when Quit is called,
// regardless of outstanding references.
oXL.UserControl = true;

oXL.Quit();
}
catch (Exception ex)
{
Console.WriteLine("Solution1.AutomateExcel throws the error: {0}",
ex.Message);
}
finally
{
// Clean up the unmanaged Excel COM resources by explicitly
// calling Marshal.FinalReleaseComObject on all accessor objects.
// See http://support.microsoft.com/kb/317109. 
if (oRng2 != null)
{
Marshal.FinalReleaseComObject(oRng2);
oRng2 = null;
}
if (oRng1 != null)
{
Marshal.FinalReleaseComObject(oRng1);
oRng1 = null;
}
if (oCells != null)
{
Marshal.FinalReleaseComObject(oCells);
oCells = null;
}
if (oSheet != null)
{
Marshal.FinalReleaseComObject(oSheet);
oSheet = null;
}
if (oWB != null)
{
Marshal.FinalReleaseComObject(oWB);
oWB = null;
}
if (oWBs != null)
{
Marshal.FinalReleaseComObject(oWBs);
oWBs = null;
}
if (oXL != null)
{
Marshal.FinalReleaseComObject(oXL);
oXL = null;
}
}
}
}
}