C#wpf如何传递变量Excel。工作表从按钮点击到另一个按钮点击

我正在编写C#WPF easy程序，用于对excel中的特定列进行排序，在将变量excel.worksheet从单击按钮传递到另一个单击按钮时遇到问题。 代码如下：

using Microsoft.Win32;
using System.IO;
using System;
using System.Windows;
using Excel = Microsoft.Office.Interop.Excel;

namespace Sorting
{
    public partial class MainWindow : Window
    {

        int column, CounterRow;
        string filepath;
        Excel.Worksheet x = new Excel.Worksheet();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Choose_Files_Button_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Multiselect = false;
            ofd.Filter = "All files (*.*)|*.*";
            ofd.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            if (ofd.ShowDialog() == true)
            {
                ListBox_Files.Items.Clear();
                filepath = ofd.FileName;
                ListBox_Files.Items.Add(Path.GetFileName(filepath));

            }
            if (ListBox_Files.Items.Count != 0) ListBox_Files.IsEnabled = Otworz.IsEnabled = true;
        }

        private void Button_Click_0(object sender, RoutedEventArgs e)
        {
            Excel.Application excel = new Excel.Application();
            excel.Visible = true;
            excel.DisplayAlerts = false;

            Excel.Workbook sheet = excel.Workbooks.Open(filepath);
            Excel.Worksheet x = excel.ActiveSheet as Excel.Worksheet;

            MessageBox.Show("select column");

            Sort(x,1);

            MessageBox.Show("end");

            excel.Quit();
        }

        void Button_Click(object sender, RoutedEventArgs e)
        {
            Excel.Application excel = new Excel.Application();
            excel.Visible = true;
            excel.DisplayAlerts = false;

            Excel.Workbook sheet = excel.Workbooks.Open(filepath);
            Excel.Worksheet x = excel.ActiveSheet as Excel.Worksheet;

        }

        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Sort(x, 1);
        }

        private void Button_Click_2(object sender, RoutedEventArgs e)
        {
           Sort(x, 2);
        }

        private void Sort(Excel.Worksheet excel, int info)
        {
            Excel.Range rng = excel.Application.ActiveCell;
            column = rng.Column;            

            Excel.Range userRange = excel.UsedRange;
            CounterRow = userRange.Rows.Count;

            Excel.Range range = excel.Range[excel.Cells[7, 1], excel.Cells[CounterRow - 1, 8]];

            if (info == 1) range.Sort(range.Columns[column], Excel.XlSortOrder.xlAscending);
            else if (info == 2) range.Sort(range.Columns[column], Excel.XlSortOrder.xlDescending);
        }
    }
}

---

谁能解释一下，为什么单击按钮0起作用，而我通过单击按钮打开文件，然后通过单击按钮1对列进行排序，单击按钮2不起作用？VisualStudio说：“System.InvalidCastException”

当您正在将

x

转换为

Excel时，它不起作用。工作表
类型，但实际上
x
不能转换为上述类型。在进行调试时，您可以检查
x
的类型，并验证“x”是否可以转换为
Excel。工作表
typeOk，谢谢您的回答：）但是您知道如何解决此问题吗？我应该如何声明此变量才能使其工作？没关系；）我刚刚解决了这个问题：）我必须在主类的开头声明：Excel.Worksheet x；Excel.Application Excel=新建Excel.Application（）；我还必须添加：Excel.Worksheet x=Excel.ActiveSheet作为Excel.Worksheet；在“每个单击按钮”对话框中，该按钮无效。当我更仔细地阅读时，我把它读了出来