Question

星期一的用户输入日期应以“ 1”返回，而整数输入的“ 1”则应以“ Monday”返回。现在，零代表星期一。我的理解是，我需要向其添加1，因此需要如下所示的+1，但这只会使事情更加复杂。任何输入表示赞赏。

string[] days = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

public Form1()
{
    InitializeComponent();
}

private void BtnGetNum_Click(object sender, EventArgs e)
{
    string dayName = (txtDayName.Text);
    int dayIndex, dayNumber;
    dayIndex = Array.IndexOf(days, dayName);
    lblNumOut.Text = dayIndex.ToString();
}

private void BtnGetDay_Click(object sender, EventArgs e)
{
    int dayNumber;
    if (int.TryParse(txtDayNum.Text, out dayNumber) == false || dayNumber < 1 || dayNumber > 7)
    {
        MessageBox.Show("Must be a valid number from 1 to 7.");

    }
    lblNameOut.Text = (days[dayNumber + 1]);
}

Answer 1

应该是这样的：

private void BtnGetNum_Click(object sender, EventArgs e)
{
    string dayName = txtDayName.Text;
    int dayIndex;
    //To find the index of the day ignoring the case, so the input can be monday, Monday, mOnDaY...etc.
    dayIndex = Array.FindIndex(days, a => a.Equals(dayName, StringComparison.CurrentCultureIgnoreCase));
    //Check if the input is a valid day name:
    if(dayIndex == -1)
    {
        MessageBox.Show("Enter correct day name.");
        return;
    }
    lblNumOut.Text = (dayIndex + 1).ToString();
}

private void BtnGetDay_Click(object sender, EventArgs e)
{
    int dayNumber;
    if (!int.TryParse(txtDayNum.Text, out dayNumber) || dayNumber < 1 || dayNumber > 7)
    {
        MessageBox.Show("Must be a valid number from 1 to 7.");
        return;
    }
    //0-based index. When the input say = 3, that means the value position in the array is 3 - 1 = 2.
    lblNameOut.Text = days[dayNumber - 1];
}

祝你好运

从天的字符串数组中正确显示天数

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