这样的数字转字符串有什么作用呢?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace Ex04_07
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
textBox2.Text = Convert.ToString(Convert.ToInt32(textBox1.Text));
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace Ex04_07
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private void button1_Click(object sender, EventArgs e)
{
textBox2.Text = Convert.ToString(Convert.ToInt32(textBox1.Text));
}
}
}
textBox2.Text = Convert.ToString(Convert.ToInt32(textBox1.Text));
}catch
{
MessageBox.Show("The input is of wrong format, please input a number!");
}
下面得写法比较好
private void button1_Click(object sender, EventArgs e)
{
int num;
if(int.TryParse(textBox1.Text,out num))
{
textBox2.Text = textBox1.Text;
}
}