[英]how do I turn this into a custom excel function?
我有以下C#代碼,可從數據庫中提取數據並在Excel加載時使用數據填充單元格A1。 我如何將其轉換為自定義函數,從而在用戶鍵入公式(即'= getMyData(“ mycustominput”)')而不是在加載excel時填充該字段?
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Excel;
using MySql.Data.MySqlClient;
namespace custom_excel
{
public partial class ThisAddIn
{
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
Excel.Worksheet activeWorksheet = ((Excel.Worksheet)Application.ActiveSheet);
Excel.Range firstRow = activeWorksheet.get_Range("A1", missing);
firstRow.EntireRow.Insert(Excel.XlInsertShiftDirection.xlShiftDown, System.Type.Missing);
Excel.Range newFirstRow = activeWorksheet.get_Range("A1", missing);
string connString = "Server=localhost;Port=3306;Database=test;Uid=name;password=password";
MySqlConnection conn = new MySqlConnection(connString);
MySqlCommand command = conn.CreateCommand();
command.CommandText = "SELECT field_value FROM customers LIMIT 1";
try
{
conn.Open();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
MySqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
newFirstRow.Value2 = reader["field_value"].ToString();
}
}
private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
{
}
private void InternalStartup()
{
this.Startup += new System.EventHandler(ThisAddIn_Startup);
this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
}
}
}
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