在 C# 中访问打开的 Excel 工作簿答案

【问题标题】：Accessing an open Excel Workbook in C#在 C# 中访问打开的 Excel 工作簿
【发布时间】：2011-07-13 16:58:48
【问题描述】：

我需要访问一个已经打开的 Excel 文件。我以为只是检查.Workbooks 属性，它会在那里，但事实并非如此。获取对打开的工作簿的引用的正确方法是什么？

var app = new Microsoft.Office.Interop.Excel.Application();

// the count is 0 =(
app.Workbooks.Count == 0;

编辑

我可以通过...获得对 Excel 应用程序的引用

app = (Excel.Application)Marshal.GetActiveObject("Excel.Application");

但是app.Workbooks.Count 仍然是0 为什么它无法获得对打开的工作簿的引用？

【问题讨论】：

标签： c# excel ms-office office-interop excel-interop

【解决方案1】：

检查现有实例，而不是实例化一个新实例：

try
{
  Microsoft.Office.Interop.Excel.Application app = 
      System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
}
catch
{
  // Excel is not running.
}

【讨论】：

这似乎引用了 Excel 应用程序 app != null 但 app.Workbooks.Count 仍然是 0。为什么它没有获得对打开的工作簿的引用？
Excel 互操作可能很烦人。最重要的是确保您始终释放 Excel 应用程序对象。否则，您将运行 EXCEL.exe 的幽灵实例。因此，关闭所有 Excel 实例，然后再次尝试该代码。最后，阅读这篇文章，了解如何正确发布 Excel support.microsoft.com/default.aspx?scid=kb;EN-US;317109
另外，请参阅此线程以进行适当的清理和讨论：stackoverflow.com/questions/158706/…
我不认为我的问题与发布应用程序有关，尽管该链接有所帮助...但我什至无法访问打开的工作簿。我可以访问 Excel 应用程序本身，但我找不到工作簿
验证 - 您是否检查了在任务管理器中打开了多少 Excel 实例？

【解决方案2】：

试试这个代码：

using Excel = Microsoft.Office.Interop.Excel;

public Excel.Application xlApp;
public Excel.Workbook xlWorkBook;
public Excel.Worksheet xlWorkSheet;

public void ExcelTransferData()
{
   xlApp = new Microsoft.Office.Interop.Excel.Application();
   xlApp = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

   foreach (Excel.Workbook item in xlApp.Workbooks)
   {
        //Select the excel target 'NAME'
        if (item.Name == "Template.xlsx")
        {
            xlWorkBook = item; 
            break;
        }

        //Select the target workbook
        xlWorkSheet = xlWorkBook.Sheets[1] as Excel.Worksheet;
        //Set cell value
        xlWorkSheet.Cells[5, 1] = "davinceleecode";
   }
}

【讨论】：

【解决方案3】：

 String constr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+txtSourceFile.Text+";Extended Properties='Excel 8.0;HDR=YES;';";
        String constr2 = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + txtLibrary.Text + ";Extended Properties='Excel 8.0;HDR=YES;';";

        OleDbConnection con = new OleDbConnection(constr);
        OleDbConnection con2 = new OleDbConnection(constr2);
        OleDbConnection con3 = new OleDbConnection(constr);

        OleDbCommand oconn = new OleDbCommand("Select * From [eudra$]", con);
        OleDbCommand oconn2 = new OleDbCommand("Select * From [Sheet1$]", con2);
        OleDbCommand oconn3 = new OleDbCommand("Select * From [eudra$] where EXAMPARM in ('with one or more serious adverse events','with one or more non-serious adverse events that met the incidence cutoff')", con);

        if (txtSourceFile.Text != "")
        {
            con.Open();
            con2.Open();
            con3.Open();

            OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
            OleDbDataAdapter sda2 = new OleDbDataAdapter(oconn2);
            OleDbDataAdapter sda3 = new OleDbDataAdapter(oconn3);


            DataTable data = new DataTable();
            sda.Fill(data);

            DataTable data2 = new DataTable();
            sda2.Fill(data2);

            DataTable data3 = new DataTable();
            sda3.Fill(data3);

            var test = JoinDataTables(data, data2, (row1, row2) => (row1.Field<string>("BODY_SYS").ToUpper() == row2.Field<string>("Term").ToUpper() ));

            data3.Merge(test, true);

            dgvImp.DataSource = data3;
            con.Close();
        }

【讨论】：

【解决方案4】：

第一个函数IsXlFileOpen会告诉你excel文件是否打开与否。

第二个函数 GetXlSheet 将为您提供 Excel 应用程序，工作簿和工作表输出，您可以从那里开始编码。

using System.Collections.Generic;
using System.IO;
using System.Linq;
using wf = System.Windows.Forms;
using xl = Microsoft.Office.Interop.Excel;

public static class ExcelTest
{   
    public xl.Application xlApp = null;
    public xl.Workbook xlWb = null;
    public xl.Worksheet xlWs = null;

    public static bool IsXlFileOpen(string xlFileName)
    {       
        try
        {       
            if (!File.Exists(xlFileName))
            {
                wf.MessageBox.Show("Excel File does not exists!");
                return false;
            }

            try
            {
                xlApp = (xl.Application)Marshal.GetActiveObject("Excel.Application");
            }
            catch (Exception ex)
            {
                return false;
            }

            foreach (xl.Workbook wb in xlApp.Workbooks)
            {
                if (wb.FullName == xlFileName)
                {
                    xlWb = wb;
                    return true;
                }
            }

            return false;
        }
        catch (Exception ex)
        {
            return false;
        }
    }

    public static void GetXlSheet(string xlFileName,
                                    string xlSheetName)
    {
        try
        {
            if (!File.Exists(xlFileName))
            {
                wf.MessageBox.Show("Excel File does not exists!");
                return false;
            }

            xlApp = (xl.Application)Marshal.GetActiveObject("Excel.Application");
            foreach (xl.Workbook wb in xlApp.Workbooks)
            {
                if (wb.FullName == xlFileName)
                {
                    if (!xlWb
                        .Sheets
                        .Cast<xl.Worksheet>()
                        .Select(s => s.Name)
                        .Contains(xlSheetName))
                    {
                        wf.MessageBox.Show("Sheet name does not exist in the Excel workbook!");
                        return;
                    }
                    xlWs = xlWb.Sheets[xlSheetName];
                }
            }
        }
        catch (Exception ex)
        {
            // catch errors
        }
    }   
}

【讨论】：

【解决方案5】：

添加到 Armbrat 的解决方案中；这对我有用：

// To use currently running instance of Excel 
Excel.Application objApp = 
(Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");
    Excel.Workbooks objBooks;    
    Excel._Workbook objBook;
            
objBooks = objApp.Workbooks;    // Adds to the workbooks collection - objBooks.Count will now == 1

objBook = objBooks["Name of workbook"]; // No filename extension, just the name shown in the workbook window title bar

【讨论】：

【解决方案6】：

我知道它的老问题，但我只是发布我的解决方案我的解决方案是

在 excel 应用程序对象处执行“Marshal.GetActiveObject”
如果没有找到工作簿
然后，释放 excel 应用程序 hwnd 并再次获取活动对象希望对你有帮助

【讨论】：

【解决方案7】：

// creating Excel Application
Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();

// creating new WorkBook within Excel application
Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);

// creating new Excelsheet in workbook
Microsoft.Office.Interop.Excel._Worksheet worksheet = null;

// see the excel sheet behind the program
app.Visible = true;

// get the reference of first sheet. By default its name is Sheet1.
// store its reference to worksheet
worksheet = workbook.Sheets["Sheet1"];
worksheet = workbook.ActiveSheet;

// changing the name of active sheet
worksheet.Name = "Exported from gridview";

try
{
    // storing header part in Excel
    for (int i = 1; i < dgvRESULTS.Columns.Count + 1; i++)
    {
        worksheet.Cells[1, i] = dgvRESULTS.Columns[i - 1].HeaderText;
        worksheet.Cells[1, i].Interior.Color = System.Drawing.Color.LightYellow;
    }

    // storing Each row and column value to excel sheet
    for (int i = 0; i < dgvRESULTS.Rows.Count - 1; i++)
    {
        for (int j = 0; j < dgvRESULTS.Columns.Count; j++)
        {
            if (dgvRESULTS.Rows[i].Cells[j].Value != null)
            {
                worksheet.Cells[i + 2, j + 1] = dgvRESULTS.Rows[i].Cells[j].Value.ToString();
                //worksheet.Cells[i + 2, j + 1].Interior.Color = System.Drawing.ColorTranslator.ToOle(dgvRESULTS.Rows[i].DefaultCellStyle.BackColor);
            }
            else
            {
                worksheet.Cells[i + 2, j + 1] = "";
            }
        }
    }
}
catch(NullReferenceException ne)
{
}
string filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
// save the application
workbook.SaveAs(filePath +"\\output.xls", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

// Exit from the application
app.Quit();

【讨论】：

这个答案似乎与问题无关。