Question

我尝试在excel中调用selectionchange事件，但它会触发两次。我用编组连接到一个打开的Excel文件，所以代码如下

首先，我在for Form1上发布代码



using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Diagnostics;
using Excel = Microsoft.Office.Interop.Excel;

namespace Excel_Sol_Taraf_Onaylama_V._00
{
    public partial class Form1 : Form
    {


        public Form1()
        {
            InitializeComponent();
        }



        private void btn_Excele_Baglan_Classtan_Click(object sender, EventArgs e)
        {
            try
            {

                ExcelSinifveOlaylar myExcel = new ExcelSinifveOlaylar();

                Excel.Application oXL = (Excel.Application)myExcel.oXL1("Test.xlsx");

                try
                {
                    myExcel.Excel_OlaylariTanimla();
                    MessageBox.Show("Excel Olayları Tanımlandı");
                }
                catch (Exception)
                {

                    throw;
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
                throw;
            }
        }
    }
}

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Reflection; using System.Diagnostics; using Excel = Microsoft.Office.Interop.Excel; namespace Excel_Sol_Taraf_Onaylama_V._00 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btn_Excele_Baglan_Classtan_Click(object sender, EventArgs e) { try { ExcelSinifveOlaylar myExcel = new ExcelSinifveOlaylar(); Excel.Application oXL = (Excel.Application)myExcel.oXL1("Test.xlsx"); try { myExcel.Excel_OlaylariTanimla(); MessageBox.Show("Excel Olayları Tanımlandı"); } catch (Exception) { throw; } } catch (Exception ex) { MessageBox.Show(ex.ToString()); throw; } } } }

以下是ExcelSinifveOlaylar类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Excel = Microsoft.Office.Interop.Excel;
using System.Windows.Forms;
using System.Reflection;
using System.Threading;

namespace Excel_Sol_Taraf_Onaylama_V._00
{


    class ExcelSinifveOlaylar
    {

        //Marshalling ile excel bağlantısı için nesneler
        Excel.Application oXL;
        Excel._Workbook oWB;
        Excel.Worksheet oSheet;

        //Excel event delegate variables:
        Excel.AppEvents_WorkbookBeforeCloseEventHandler EventDel_BeforeBookClose; //
        Excel.DocEvents_ChangeEventHandler EventDel_CellsChange;
        Excel.DocEvents_SelectionChangeEventHandler EventDel_SelChange;
        int eventtrigger = 0;
        public Excel._Application oXL1(string strDosyaAdi)
        {
            oXL = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application");

            int intFileNr = 2;
            //This for statement part is only to connect to the test.xls
            for (int i = 1; i <= 3; i++)
            {
                intFileNr = i;
                try
                {
                    oWB = (Excel._Workbook)oXL.Workbooks.get_Item(i);
                    if (strDosyaAdi == oWB.Name)
                    {
                        oSheet = (Excel.Worksheet)oWB.ActiveSheet;
                        MessageBox.Show("Connected to " + strDosyaAdi + "Aktif Sayfa: " + oSheet.Name.ToString());
                    }

                    Excel_OlaylariTanimla();
                    break;
                }
                catch
                {
                    intFileNr = i;
                }
            }
            return oXL;
        }
        public void Excel_OlaylariTanimla()
        {
            try
            {
                EventDel_SelChange = new Excel.DocEvents_SelectionChangeEventHandler(SelChange);
                oSheet.SelectionChange += EventDel_SelChange;
               // EventDel_CellsChange = new Excel.DocEvents_ChangeEventHandler(CellsChange);
               // oSheet.Change += EventDel_CellsChange;
            }
            catch (Exception ex)
            {
                throw;
            }
        }
        private void SelChange(Excel.Range Target)
        {

            //MessageBox.Show("Selection Changed");
            eventtrigger++;
            MessageBox.Show(eventtrigger.ToString());
        }
}

当我更改excel中的选定单元格时，selectionchange事件触发了两次。所以eventtrigger变为2而不是1。

我觉得这两个类中的声明可能导致这个问题

使用Excel = Microsoft.Office.Interop.Excel;

但我不确定。感谢您的支持。

Answer 1

你能试试一次cell change活动吗？直接尝试以下代码，而不是在define events中创建事件。

//Add an event handler for the Change event of both worksheet objects.
   EventDel_CellsChange = new Excel.DocEvents_ChangeEventHandler( CellsChange);

   xlSheet1.Change += EventDel_CellsChange;

private void CellsChange(Excel.Range Target )
{
   //This is called when any cell on a worksheet is changed.
   Debug.WriteLine("Delegate: You Changed Cells " + 
      Target.get_Address( Missing.Value, Missing.Value, 
      Excel.XlReferenceStyle.xlA1, Missing.Value, Missing.Value ) + 
      " on " + Target.Worksheet.Name);
}

Reference MSND:Handle Events for Excel by Using Visual C# .NET

Answer 2

删除

    private void btn_Excele_Baglan_Classtan_Click(object sender, EventArgs e)
    {
        try
        {

            ExcelSinifveOlaylar myExcel = new ExcelSinifveOlaylar();

            Excel.Application oXL = (Excel.Application)myExcel.oXL1("Test.xlsx");

            try
            {
               //because of this its occuring 2 times as its already registered from class constructor //myExcel.Excel_OlaylariTanimla();
                MessageBox.Show("Excel Olayları Tanımlandı");
            }
            catch (Exception)
            {

                throw;
            }

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
            throw;
        }
    }

Excel选择更改事件触发两次C＃

2 个答案: