关于c＃：为什么我的Excel office对象留下了EXCEL.exe进程？

Why is my Excel office object leaving behind EXCEL.exe processes?

本问题已经有最佳答案，请猛点这里访问。

我有一个应用程序使用了Office Interop库。

此库是从以iis7为宿主的ASP.NET应用程序调用的。

相关的代码位是：

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/// <summary>
/// Provides excel functions.
/// </summary>
public class ExcelStuff : IDisposable
{
#region Excel Components

// The following are pre-allocated Excel objects that must be explicitly disposed of.

private Excel.Application xApp;
private Excel.Workbooks xWorkbooks;
private Excel.Workbook xWorkbook;
private Excel.Sheets xWorksheets;
private Excel.Worksheet xWorksheet;
private Excel.ChartObjects xCharts;
private Excel.ChartObject xMyChart;
private Excel.Chart xGraph;
private Excel.SeriesCollection xSeriesColl;
private Excel.Series xSeries;

#endregion

/// <summary>
/// Initializes a new instance of the <see cref="ExcelStuff" /> class.
/// </summary>
public ExcelStuff()
{
}

/// <summary>
/// Does some work.
/// </summary>
public void DoWork()
{
byte[] data = new byte[0];

worker = new Thread(() =>
{
// Do some work.
});

worker.Start();
worker.Join();

worker.Abort();
worker = null;

Dispose();
}

/// <summary>
/// Disposes the current object and cleans up any resources.
/// </summary>
public void Dispose()
{
// Cleanup
xWorkbook.Close(false);
xApp.Quit();

// Manual disposal because of COM
xApp = null;
xWorkbook = null;
xWorksheets = null;
xWorksheet = null;
xCharts = null;
xMyChart = null;
xGraph = null;
xSeriesColl = null;
xSeries = null;

GC.Collect();
}
}

您会注意到代码中有很多冗余，这是我为解决这个问题所做的绝望的尝试。所以请不要告诉我打电话给GC.Collect()是没有效率的，或者从班里打电话给Dispose()是不好的——我已经知道这些了。

我想知道的是，当我尽最大努力清理尽可能多的对象时，为什么这段代码会让孤立的EXCEL.exe进程在服务器上运行。