将YYYYMMDD字符串转换为MM / DD / YYYY字符串 [英] Convert YYYYMMDD string to MM/DD/YYYY string

问题描述

我有一个日期以YYYYDDMM格式存储为字符串。我想以 MM / DD / YYYY格式显示该值。我在用C＃编程。我正在使用的当前代码如下：

I have a date that is stored as a string in the format YYYYDDMM. I would like to display that value in a 'MM/DD/YYYY' format. I am programming in c#. The current code that I am using is as follows:

txtOC31.Text = dr["OC31"].ToString().Trim();
strOC31date = dr["OC31DATE"].ToString().Trim();
DateTime date31 = DateTime.Parse(strOC31date);
strOC31date = String.Format("{0:MM/dd/yyyy}", date31);

但是，我收到一个错误消息，因为YYYYMMDD字符串（strOC31date）没有被识别为有效字符串约会时间。

However, I am getting an error because the YYYYMMDD string (strOC31date) is not being recognized as a valid datetime.

推荐答案

DateTime.ParseExact带有示例

DateTime.ParseExact with an example

string res = "20120708";
DateTime d = DateTime.ParseExact(res, "yyyyddMM", CultureInfo.InvariantCulture);
Console.WriteLine(d.ToString("MM/dd/yyyy"));

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