如何确定日期时间选择器值是否已更改？ [英] How to find out if datetime picker value is changed or not?

问题描述

有两件事。一个是ValueChanged，另一个是TextChanged



如果价值改变了，那么我可以做一些我真正需要的事情



但是下面两个条件得到同样的错误



怎么知道价值是否改变了？

There are two events. One is ValueChanged and another one is TextChanged

If value is changed then I can do something that is my need actually

But following two conditions getting same error

How to know the value is changed or not?

if (datetimepicker.ValueChanged == true)
       {
          strMonthCode = "JAN";
        }
      else if (datetimepicker.TextChanged == true)
        {
          strMonthCode = "FEB";
        }

在这两种情况下我都收到错误

In both cases I am getting an error

推荐答案

你不能那样使用它们。他们是事件 - 而不是财产。您需要添加一个事件处理程序。类似于：

You can''t use them like that. They''re events - not properties. You need to add an eventhandler. Something like:

public partial class Form1 : Form
{
    private bool dateChanged = false;

    private void Form1_Load(object sender, EventArgs e)
    {
        dateTimePicker1.ValueChanged += new System.EventHandler(dateTimePicker1_ValueChanged);
    }

    private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
    {
        dateChanged = true;
        //Here you can do stuff that needs to be done when the value changes
    }

    private void button1_Click(object sender, EventArgs e)
    {
        //Example: Here you can check if the value has changed since you opened the form:
        if (dateChanged)
        {
            //The date has been changed - do what I need to do
        }
    }
}

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