如何在C#.net中比较日期 [英] how can i compare the dates in C#.net

问题描述

大家好，

如果我有两个文本框并给出两个日期.

我正在检查第二个文本框日期应大于第一个文本框日期.

如何在C#.net中比较日期?

例如

TextBox1.Text =''2011-06-16T05:07:57 + 0000''
TextBox2.Text =''2011-06-16T06:07:57 + 0000''

请帮助我.

Hi All,

If I have two textboxes and I give two dates.

I am checking the second textbox date should be greater than the first textbox date.

How can I compare the dates in C#.net?

for e.g.

TextBox1.Text=''2011-06-16T05:07:57+0000''
TextBox2.Text=''2011-06-16T06:07:57+0000''

Please help me.

推荐答案

不要将字符串与日期的字符串表示形式进行比较，以结构System.DateTime的形式比较时间值.
首先，您真的必须在编辑框中输入此数据吗?一些日期时间或日历选择器可行吗? —它会首先为您提供结构的价值.

例如，看这篇文章:
DateTimePicker Web控件 [System.TimeSpan的形式返回结果.这是一组全面的运算符，可以满足您的所有比较需求.

—SA

Don''t compare strings with string representation of dates, compare time values in the form of structure System.DateTime.

First of all, do you really have to enter this data in edit box? Is some date-time or calendar picker feasible? — it would provide you with the value of the structure in first place.

For example, look at this article:
DateTimePicker Web Control[^].

If you still want to get time from text, the conversion shown by Debata is correct.

When you have two instances of DateTime structure you can use operators "==", "!=" and ">", "<", ">=", "<=" in the sense "later", "earlier", "not earlier", "not later", respectively. Also, you can use subtraction operator ("-") which returns the result in the form of System.TimeSpan. This is a comprehensive set of operators to cover all your comparison needs.

—SA

您应该使用日期时间选择器"控件而不是文本框，这对于开发人员来说更专业.

You should use "date time picker" control instead of text boxes this is more professional as a developer.

DateTime fromdate = Convert.ToDateTime(TextBox1.Text);
DateTime todate = Convert.ToDateTime(TextBox2.Text);
if (todate.CompareTo(fromdate) < 0)
{
//add you logic
}

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