格式异常，我做错了什么？

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问题描述

我希望我的应用程序，当有人输入信件或不是数字的某个信息时，会显示以下消息：您必须输入一个数字！

I want that my app, when someone enters a letter, or sometehing that isn't a number, shows this message: "You must enter a number!"

void Button_guessClick(object sender, EventArgs e)
{
    try
    {
        int guess = Convert.ToInt32(textBox_guess.Text);
    }
    catch(FormatException ex)
    {
    	MessageBox.Show("You must enter a number!");
    }

    if (guess > number)
    {
    	MessageBox.Show("The number is smaller!");
    }

    if (guess < number)
    {
    	MessageBox.Show("The number is bigger!");
    }

    if (guess == number)
    {
    	MessageBox.Show("Bravo, you have guessed it");
    	Application.Exit();
    }
}

推荐答案

int guess;

if (!int.TryParse(textbox_guess.Text, out guess))
   {
   MessageBox.Show("You must enter a number!");
   }
else
   {
   if (guess > number...

缩进还原 - OriginalGriff [/ edit]

[edit]Indentation reverted - OriginalGriff[/edit]

try{
int guess = Convert.ToInt32(textBox_guess.Text);
}

catch(FormatException ex){
    MessageBox.Show("You must enter a number!");
    return; // this will return from your function no more messages will show..
}

你最好使用 Int32.TryParse 作为其他答案指出。

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