无法获取行数和列数（使用 Microsoft.Office.Interop.Excel ）答案

【问题标题】：unable to get row and column count (using Microsoft.Office.Interop.Excel )无法获取行数和列数（使用 Microsoft.Office.Interop.Excel ）
【发布时间】：2017-06-27 19:30:59
【问题描述】：

我能够正确打开和读取 excel 文件，但是输出不会停止。当有空单元格时，它会继续运行。一旦程序到达没有数据的单元格，如何让程序停止？

我已阅读其他帖子并尝试过this 帖子，因为解决方案有点相似。代码有什么问题？

感谢您的帮助

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Runtime.InteropServices; 
using System.Text; 
using System.Threading.Tasks; 
using Excel = Microsoft.Office.Interop.Excel;

namespace ConsoleApplication1 {
    class Program
    {
        private static int colCount;
        private static int rowCount;

        static void Main(string[] args)
        {
            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(@"C:\File.xlsx");
            Excel._Worksheet xlWorksheet = xlWorkbook.Sheets[1];
            Excel.Range xlRange = xlWorksheet.UsedRange;


            int rowCount = xlWorksheet.Rows.Count;
            int colCount = xlWorksheet.Columns.Count;

            for (int i = 1; i <= rowCount; i++)
            {
                for (int j = 1; j <= colCount; j++)
                {
                    //new line
                    if (j == 1)
                    {
                        Console.Write("\r\n"); 

                    }

                    //write the value to the console
                    if (xlWorksheet.Cells[i, j].Value2 != null)
                    {
                        Console.Write(xlRange.Cells[i, j].Value2.ToString() + "\t");
                    }
                }
            }

            //cleanup
            GC.Collect();
            GC.WaitForPendingFinalizers();

            //rule of thumb for releasing com objects:
            //  never use two dots, all COM objects must be referenced and released individually
            //  ex: [somthing].[something].[something] is bad

            //release com objects to fully kill excel process from running in the background
            Marshal.ReleaseComObject(xlRange);
            Marshal.ReleaseComObject(xlWorksheet);

            //close and release
            xlWorkbook.Close();
            Marshal.ReleaseComObject(xlWorkbook);

            //quit and release
            xlApp.Quit();
            Marshal.ReleaseComObject(xlApp);
        }
    } }

【问题讨论】：

xlRange.Rows.Count 而不是 xlWorksheet.Rows.Count
@Slai，试过了。仍然做同样的事情。
find the last used cell 的方法有很多种，但也取决于你之后做什么。如果您只想要制表符分隔的字符串中的数据，您可以 xlWorksheet.Cells.Copy 并从剪贴板中获取文本。

标签： c# excel

【解决方案1】：

这行得通。我是从this s.o 帖子中得到的。如果有人可以解释System.Reflection.Missing.Value，那将非常有帮助。

// Find the last real row
lastUsedRow = worksheet.Cells.Find("*",System.Reflection.Missing.Value, 
                               System.Reflection.Missing.Value, System.Reflection.Missing.Value, 
                               Excel.XlSearchOrder.xlByRows,Excel.XlSearchDirection.xlPrevious, 
                               false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Row;

// Find the last real column
lastUsedColumn = worksheet.Cells.Find("*", System.Reflection.Missing.Value, 
                               System.Reflection.Missing.Value,System.Reflection.Missing.Value, 
                               Excel.XlSearchOrder.xlByColumns,Excel.XlSearchDirection.xlPrevious, 
                               false,System.Reflection.Missing.Value,System.Reflection.Missing.Value).Column;

【讨论】：