C# 从datetimepicker计算两个日期之间的差异

我想计算两个日期之间的差异，一个是选取的表单dateTimePicker1，另一个是2014年2月20日，并将其存储在字符串中，添加到我的数组中，并能够以另一种形式显示它

这是我的代码：

    TimeSpan getDateDifference(DateTime date1, DateTime date2)
    {
        TimeSpan ts = date1 - date2;
        int differenceInDays = ts.Days;
        string differenceAsString = differenceInDays.ToString();
        return ts;

    }


    public class Patient
    {
        public string patientidString;
        public string firstNameString;
        public string lastNameString;
        public string dateString;
        public string differenceAsString;


        public Patient()
        {
            patientidString = "";
            firstNameString = "";
            lastNameString = "";
            dateString = "";
        }

    }


    //Array
    Patient[] patientInfo = new Patient[10];




    private void button1_Click(object sender, EventArgs e)
    {
        TimeSpan difference = getDateDifference(new DateTime(2014, 2, 20), dateTimePicker1.Value);
        if (textBox1.Text.Length == 0 || textBox2.Text.Length == 0 || textBox3.Text.Length == 0)
        {
            MessageBox.Show(" Patient id, first name and last name cannot be empty");
        }

        else
        try
        {
            foreach (Patient patientinfoIndex in patientInfo)

            patientInfo[itemCountInteger].patientidString = textBox1.Text;
            patientInfo[itemCountInteger].firstNameString = textBox2.Text;
            patientInfo[itemCountInteger].lastNameString = textBox3.Text;
            patientInfo[itemCountInteger].dateString = dateTimePicker1.Text;

            string names = patientInfo[itemCountInteger].patientidString + "  " + patientInfo[itemCountInteger].firstNameString + " " + patientInfo[itemCountInteger].lastNameString;
            listBox1.Items.Add(names);
            itemCountInteger++;
            listBox1.SelectedItem = names;
        }
        catch
        {
            MessageBox.Show("Contacts are limited to 20. Please delete some contacts prior to adding more.");
        }


    }


    //Search Button search a patients name and display his surname in the label if patient is found  display his surname
    private void button2_Click(object sender, EventArgs e)
    {

        int intTest = 0;

        for (int x = 0; x < patientInfo.Length; x++)
        {
            if (textBox4.Text == patientInfo[x].patientidString)
            {
                label6.Text = (patientInfo[x].firstNameString + "  " + patientInfo[x].lastNameString);
                PatientForm patientform = new PatientForm();
                patientform.Show();
                patientform.label6.Text = (patientInfo[x].patientidString);
                patientform.label7.Text = (patientInfo[x].firstNameString);
                patientform.label8.Text =(patientInfo[x].lastNameString);
                patientform.dateTimePicker1.Text = (patientInfo[x].dateString);

---

你可以减去任何两个日期，它就会起作用

DateTime date1 = new DateTime(2014,02,20);
DateTime date2 = dateTimePicker1.Value as DateTime;

TimeSpan difference = date1 - date2;  //dunno what difference you need so you can swap these

如果差异日<0，则将其乘以-1

注意：在这种情况下，很容易得到小时、分钟或秒的差值。

下面是上述代码在其自身方法中的一个示例：

TimeSpan getDateDifference(DateTime date1, DateTime date2)
{
    TimeSpan ts = date1 - date2;

    return ts;
}

当您想要触发此方法时：

TimeSpan difference = getDateDifference(new DateTime(2014, 2, 20), dateTimePicker.Value);

//Now you can do what you want with the TimeSpan.

int differenceInDays = difference.Days;
int differenceInHours = difference.Hours; 

Console.WriteLine(differenceInDays.ToString());

---

你想要天数上的差异？？我的错，差异应该是TimeSpan，你是对的。注释已删除，很抱歉挑剔。在类中最好在哪里声明它，在我的窗体或方法中，我如何声明我的对象dateTimePicker1等于myDateTimePicker.Value您指的是声明TimeSpan对象？如果需要，可以将上述所有代码放在一个方法中，将其称为类似于

TimeSpan getDateDifference（DateTime date1，DateTime date2）

，如果需要，可以返回

TimeSpan

，或

字符串，这取决于你想从这个方法中得到什么。我说的是写上面的代码，如果我必须写像DateTime pickerDate=myDateTimePicker.Value；我肯定会把它放在一个方法中。我将更新我的答案。您实际上不必编写
DateTime pickerDate=myDateTimePicker.Value
你可以直接使用myDateTimePicker.Value，我相信，为了可读性，有些东西是多余的。
DateTime febDate = new DateTime(2014, 2, 20);
DateTime pickerDate = myDateTimePicker.Value;

TimeSpan tspan = febDate - pickerDate;

int differenceInDays = tspan.Days;

string differenceAsString = differenceInDays.ToString();

TimeSpan getDateDifference(DateTime date1, DateTime date2)
{
    TimeSpan ts = date1 - date2;

    return ts;
}

TimeSpan difference = getDateDifference(new DateTime(2014, 2, 20), dateTimePicker.Value);

//Now you can do what you want with the TimeSpan.

int differenceInDays = difference.Days;
int differenceInHours = difference.Hours; 

Console.WriteLine(differenceInDays.ToString());