C# 循环浏览Excel工作簿，从每个工作簿复制一系列单元格并粘贴到主工作簿

嗨：我很高兴你们都在那里，因为本该如此简单的事情似乎不适合我

背景：我正试图用C打开一个Excel工作簿，使用OpenFileDialog来选择它-称为成绩册。然后，我使用FolderBrowserDialog在我选择的文件夹中循环浏览多个Excel工作簿，该对话框将文件名保存在字符串[]中。我希望逐个打开每个工作簿，从每个工作簿中提取一系列数据，并将其粘贴到成绩册中。到目前为止，捕获数组中的文件名是可行的，选择单个工作簿并打开它的能力也是可行的

问题是：我对foreach语句有问题。当我在工作簿中循环时，行：Excel.Workbook stdWorkbook=excelApp.workbooks.OpenstdFile有一个错误：上下文中不存在stdFile名称

另外，我对编程相当陌生，似乎很难找到任何能够用简单易懂的术语解释Excel和C互操作的东西。如果能找到好的消息来源，我将不胜感激

using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;  //Use Project add reference to add the       Microsoft Excel Object library, then add this statement
using System.Reflection;

namespace ExcelLoadStdDataToGradingSheet
{
    public partial class Form1 : Form
    {
        public string[] fileNames;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // select the folder with the student assignment 
            FolderBrowserDialog fbd = new FolderBrowserDialog();
            fbd.Description = "Browse to find Folder with student assignments to open";
            fbd.SelectedPath = "C:\\Users\\Robert\\Google Drive\\Programming";
            DialogResult result = fbd.ShowDialog();
            if (result == DialogResult.OK)
            {
                string[] fileNames = Directory.GetFiles(fbd.SelectedPath);
                System.Windows.Forms.MessageBox.Show("Files found: " +   fileNames.Length.ToString(), "Message");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            // Select the Excel file used for grading and open it
            OpenFileDialog dialog = new OpenFileDialog(); // Open dialog box to select   desired Excel file.  Next 3 line adjust that browser dialog
            dialog.Title = "Browse to find Grade Sheet to open";
            dialog.InitialDirectory = @"c:\\Users\\Robert\\Google Drive\\Programming";
            dialog.ShowDialog();
            string GradeExcel = dialog.FileName;
            Excel.Application excelApp = new Excel.Application();   //This creates the Excel application instance "excelApp"
            excelApp.Visible = true;
            Excel.Workbook GradeBook = excelApp.Workbooks.Add(GradeExcel);

            // Loop to open every student file, extract filename, name, Red ID, and creation date
            foreach (string stdFile in fileNames);
            {
                // Open student Workbook and copy data from "Hidden" Worksheet
                //Excel.Application newApp = new Excel.Application();  //This creates the Excel application instance "newApp"
                Excel.Workbook stdWorkbook = excelApp.Workbooks.Open(stdFile);  //Open student Workbooks
                Excel.Worksheet xlWorksheet = stdWorkbook.Sheets["Hidden"];
                Excel.Range xlRange = xlWorksheet.Range["A2:E2"];



                // Paste student information to the Grade Sheet
                //  Workbooks(GradeBook).Sheets("GradingSheet").Range("SetActiveCell").Select.Paste;  //' start  pasting in "A5";
                // SetActiveCell = ActiveCell.Offset(1, 0).Select;
                // workbooks("StdWorkbook").close savechanges:=false;
            }
            // workbooks("Gradingbook").close savechanges:=true;
        }
    }
}

此行末尾的分号立即终止语句，因此stdFile在下面的代码中不可用。去掉分号

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这里直接介绍了Excel Interop。

谢谢Andy-让我更进一步。我现在添加了3行额外的代码，见下图底部，现在得到了一个类似的消息，即当前上下文中不存在该名称成绩册。它定义在foreach语句上方，位于我添加的类的顶部：Excel.Workbook成绩册；范围？reasons.Excel.Worksheet xlGradesheet=成绩册.Sheets[1]；Excel.Range xlRangeTemp=xlGradesheet.Range[A6:E6]；xlRangeTemp=xlRange.Value；

foreach (string stdFile in fileNames);