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如果我使用这样的代码，将释放所有非托管 COM 对象

var worksheet = new Application().Workbooks.Add().Worksheets.Add();
Marshal.ReleaseComObject(worksheet);

而不是这样的代码

var excel = new Application();
var workbook = excel.Workbooks.Add();
var worksheet = workbook.Worksheets.Add();
Marshal.ReleaseComObject(excel);
Marshal.ReleaseComObject(workbook);
Marshal.ReleaseComObject(worksheet);

?

如果有一些文件，请在回答中发送链接。

4

1 回答 1

1

实际上，这两个代码示例都会让 Excel 进程在后台运行。例如，您需要调用Application.Quit()应用程序对象。以下作品：

private static void DoExcel()
    {
        var application = new Application();
        var workbook = application.Workbooks.Add();
        var worksheet = workbook.Worksheets.Add();

        // Name that this will be saved as
        string name = workbook.FullName + ".xlsx";

        string fullPath = Path.Combine(Directory.GetCurrentDirectory(), name);
        // If a file of the same name exists, delete it so that we won't be prompted if
        // we want to overwrite it when we save
        if (File.Exists(fullPath))
            File.Delete(fullPath);

        // Save the workbook - otherwise we may be prompted as to whether we want to save when we go to quit
        workbook.Save();

        // Quit the application
        application.Quit();

        // Release the references
        Marshal.ReleaseComObject(worksheet);
        Marshal.ReleaseComObject(workbook);
        Marshal.ReleaseComObject(application);

        // Release the .NET reference and run the garbage collector now to make sure the application is closed immediately
        worksheet = null;
        GC.Collect();
        GC.WaitForPendingFinalizers();
    }

还有一些需要记住的好东西：我没有在这里使用它，但是有一个Marshal.FinalReleaseComObject 方法在这些情况下非常有用。此外，我再次在我的代码示例中没有使用它，但是该Marshal.ReleaseComObject方法返回当前计数，因此如果您想确保计数达到零，您总是可以在循环中执行释放：

while (Marshal.ReleaseComObject(comObject) > 0) { }

您也可以将其用于调试目的 - 例如

int count = Marshal.ReleaseComObject(comObject);
Trace.TraceInformation("Current COM object reference count: " + count.ToString());
于 2016-11-14T16:15:41.783 回答