private void answer_operation(object sender, RoutedEventArgs e)
{
String inListContent; //写入列表框的内容
String content = answerBox.Text; //获取用户输入内容
if (content.Length == 0) //检测用户输入是否为空
{
MessageBox.Show(mainWindow, "答案不能为空");
answerBox.Focus();
}
else
{
int userAnswer = Int32.Parse(content);
if (arithmetic.CheckAnswer(userAnswer))
{
inListContent = arithmetic.strFormula + " = " + userAnswer.ToString() + " 正确";
answerList.Items.Insert(0, inListContent);
//总做题数和正确题数计数
arithmetic.rightCount++;
arithmetic.sumCount++;
answerBox.Text = "";
answerBox.Focus();
}
else
{
inListContent = arithmetic.strFormula + " = " + userAnswer.ToString() + " 错误\t" + "正确答案：" + arithmetic.formula[3].ToString();
answerList.Items.Insert(0, inListContent);
//总做题数计数
arithmetic.sumCount++;
answerBox.Text = "";
answerBox.Focus();
}
set_question(sender, e);//重新设置题目
}
}