Question

我在Windows资源管理器中双击打开了excel工作簿，但无法在代码中访问它

Excel.Application xlApp = (Application)Marshal.GetActiveObject("Excel.Application");
Excel.Workbooks xlBooks = xlApp.Workbooks;

xlBooks.Count等于0，为什么不引用我打开的工作簿？

修改

以下是各种方案以及发生的情况：

场景1：如果文件尚未打开

代码打开工作簿，我很高兴。

场景2：如果文件最初是从代码中打开的，我关闭并重新打开应用程序

代码引用文件很好xlBooks.Count等于1，我很高兴。

场景3 ：如果文件最初不是从代码打开，而是通过在资源管理器中双击它

代码打开文件xlBooks.Count的另一个实例等于0，我很愤怒！

这是现在的整个代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Excel;

public class ExcelService : IExcelService
{
    const string _filePath = @"C:\Somewhere";
    const string _fileName = @"TestFile.xlsb";
    string _fileNameAndPath = Path.Combine(_filePath, _fileName);

    Application xlApp;
    Workbooks xlBooks;
    Workbook xlBook;
    Worksheet xlSheet;

    public ExcelService()
    {
        try
        {
            xlApp = (Application)Marshal.GetActiveObject("Excel.Application");
            xlBooks = xlApp.Workbooks;

            var numBooks = xlBooks.Count;
            Log.Info("Number of workbooks: {0}".FormatWith(numBooks));
            if (numBooks > 0)
            {
                xlBook = xlBooks[1];
                Log.Info("Using already opened workbook");
            }
            else
            {
                xlBook = xlBooks.Open(_fileNameAndPath);
                Log.Info("Opening workbook: {0}".FormatWith(_fileNameAndPath));
            }

            xlSheet = (Worksheet)xlBook.Worksheets[1];

            // test reading a named range
            string value = xlSheet.Range["TEST"].Value.ToString();
            Log.Info(@"TEST: {0}".FormatWith(value));

            xlApp.Visible = true;
        }
        catch (Exception e)
        {
            Log.Error(e.Message);
        }
    }

    ~ExcelService()
    {
        GC.Collect();
        GC.WaitForPendingFinalizers();

        try
        {
            Marshal.FinalReleaseComObject(xlSheet);
        }
        catch { }

        try
        {
            Marshal.FinalReleaseComObject(xlBook);
        }
        catch { }

        try
        {
            Marshal.FinalReleaseComObject(xlBooks);
        }
        catch { }

        try
        {
            Marshal.FinalReleaseComObject(xlApp);
        }
        catch { }
    }
}

Answer 1

我知道这个帖子有点旧，但我找到了另一种方法。创建新的Excel.Application对象时，必须创建WorkBooks对象。当您访问已打开的Excel文件时，已创建WorkBooks对象，因此您只需将新工作簿添加到现有工作簿。如果您可以访问WorkBook名称，@ Tipx的解决方案很有用，但在我的情况下，当前的WorkBook名称始终是随机的。这是我想出来的解决方案：

Excel.Application excelApp = null;
Excel.Workbooks wkbks = null;
Excel.Workbook wkbk = null;

bool wasFoundRunning = false;

Excel.Application tApp = null;
//Checks to see if excel is opened
try
{
    tApp = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
    wasFoundRunning = true;
}
catch (Exception)//Excel not open
{
    wasFoundRunning = false;
}
finally
{
    if (true == wasFoundRunning)
    {
        excelApp = tApp;
        wkbk = excelApp.Workbooks.Add(Type.Missing);                    
    }
    else
    {
        excelApp = new Excel.Application();
        wkbks = excelApp.Workbooks;
        wkbk = wkbks.Add(Type.Missing);
    }
    //Release the temp if in use
    if (null != tApp) { Marshal.FinalReleaseComObject(tApp); }
    tApp = null;
}
//Initialize the sheets in the new workbook

可能不是最好的解决方案，但它可以满足我的需求。希望这有助于某人。：）

Answer 2

如果所有工作簿都在同一个Excel实例中打开（您可以通过检查是否可以使用Alt-tab切换到另一个来检查）。您可以使用Workbooks("[FileName]")简单地引用另一个。所以，例如：

Dim wb as Workbook //for C#, type Excel.Workbook wb = null;
Set wb = Workbooks("MyDuperWorkbook.xlsx") //for C#, type wb = Excel.Workbooks["MyDuperWorkbook.xlsx"];
wb.Sheets(1).Cells(1,1).Value = "Wahou!"

如何在C＃中访问已打开的Excel文件？

2 个答案: