错误：字符串未被识别为有效的日期时间 [英] Error: string was not recognized as a valid datetime

问题描述

大家好......

我正在创建一个项目，每当我遇到错误时我需要将文本框值转换为日期时间..以下是我的代码。



我尝试了什么：

Hi Everyone...
I am creating a project where i need to convert text box value into date time every time i have faced an error.. below is my code.

What I have tried:

public int Validate_DOB()
   {
       DateTime dt = DateTime.Parse(txt_DOB.Text);//error occured at this line of code
       int Validate = DateTime.Now.Year - dt.Year;
       return Validate;
   }

推荐答案

你应该使用 DateTime.TryParse [ ^ ]

或者，考虑使用datatimepicker让用户选择日期而不是允许自由格式文本的文本框。看看这个：使用jQuery插件在ASP.Net中实现DateTimePicker [ ^ ]

You should use DateTime.TryParse[^]
Alternatively, consider using a datatimepicker to let users select a date rather than a text box that allow free form text. Check this out: Implement DateTimePicker in ASP.Net using jQuery Plugin[^]

嗨Aamir，



从错误消息中可以看出错误消息 - 中的值文本框不是日期时间。你可以像Peter建议的那样使用 TryParse（）。或者你可以捕获一个 FormatException 让用户在运行时知道这个问题。

Hi Aamir,

The error is clear from the error msg - the value in the text box is not a datetime. You can use TryParse() as Peter suggested. Or you can catch a FormatException to let the user know about the problem at runtime.

try
{
    DateTime dt = DateTime.Parse(txt_DOB.Text);//error occured at this line of code
    int Validate = DateTime.Now.Year - dt.Year;
}
catch (FormatException)
{
    MessageBox.Show("This is not a valid date time.");
}

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