小编Bog*_*dan的帖子

我的C#程序有问题:我创建了一个包含10个问题和10个图像的测验.我得到这个Length cannot be less than zero.\r\nParameter name: length在线路

int imageIndex = int.Parse(line.Substring(0, delimiter));

即使在我的记事本文件中,我也包含了图像索引:

3:What is the foo in the bar? 
10:How can you add a widget? 
4:Why pick a bar over a foo?

这是代码:

if (nr >= questions.Count)
{
    button1.Enabled = false;
}
else
{
    Random r = new Random();
    int x;
    do   
    { 
        x = r.Next(questions.Count); 
    } 
    while (questions[x].displayed == true);

    textBox1.Text = questionText;
    radioButton1.Text = questions[x].answer1; 
    radioButton2.Text = questions[x].answer2;
    questions[x].displayed= true;
    current_question = x;
}