如何在 C# 中将字符串从 OnLoad 事件传递到 on Clickevent?

Question

我有一个onLoad事件，它包含从数据库中获取数据的变量，现在我需要将该字符串传递给按钮的onclick事件，以便无论何时按下它，我都可以执行操作。我需要从加载到onclick访问单词变量。

using System;    
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 MySql.Data.MySqlClient;    
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public string word, alphabets;
public int chances, score;
public Form2()
{
InitializeComponent();
}
public void Form2_Load(object sender, EventArgs e)
{
chances = 8;
score = 0;
alphabets = "abcdefghijklmnopqrstuvwxyz";
Random rnd = new Random();
int wordid = rnd.Next(1, 127);
label12.Text = chances.ToString();
label13.Text = score.ToString();
try
{
string myConnection1 = "datasource=localhost;port=3306;username=root;password=amit;";
MySqlConnection myConn1 = new MySqlConnection(myConnection1);
myConn1.Open();
int count = 0;
var cmd = new MySqlCommand(" select words from  gamers.gamewords where id='" + wordid + "';", myConn1);
string word = (string)cmd.ExecuteScalar();
int length = word.Length;
label4.Text = length.ToString();
label7.Text = alphabets;
label14.Text = word;
myConn1.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
public void button1_Click(object sender, EventArgs e)
{
//Code for Game Begins
int i = 0, j = 0;
int lengthcount = 0;
string choice = textBox1.Text;
string guess;
label14.Text = word + "**";
//  for (i = 0; i<word.Length; i++)
/*    {
if (word[i] == choice[0])
{
label14.Text = "Good Guess! You Scored a point";
lengthcount++;
score += 5;
guess = choice;
label9.Text= guess;
}
else
{
chances--;
guess = "______";
if (chances == 0)
{
label14.Text = "You Lost the Game! Turns Over";
button1.Enabled = false;
}
else
{
label14.Text = "Sorry! Try Again";
}
}
}*/
}
}
}

Answer 1

你可以像调用方法一样调用button1_Click，但不能直接向其传递值，因为Click事件由默认EventHandler处理，所以你只有两个参数：object sender和EventArgs e：

button1_Click(sender, e);

但是您可以使用Form2类中的属性(或字段/变量(来保存Form2_Load方法中的值，并在读取后在button1_Click方法中保存：

public partial class Form2 : Form
{
// ...
private string ValueToHold { get; set; }
// ...
public void Form2_Load(object sender, EventArgs e)
{
// ...
ValueToHold = "something";
// ...
}
public void button1_Click(object sender, EventArgs e)
{
// ...
// Use the ValueToHold here!
// ...
}
}