How to Solve the 'String was not recognized as a valid DateTime' Error?

ingeniously solve the "string is not recognized as valid date time" error: Date time formatting

When converting the string to the Datetime object, specifying the correct format is very important, otherwise it is prone to "string is not recognized as valid date time" error. This error is usually caused by the string format that does not match the expected format.

For example:

This code attempts to convert the string to the Datetime object with the default format, but the string follows the "DD/MM/YYYY" format. In order to solve this problem, please use dateTime.parsexact () method:

<code class="language-csharp">this.Text="22/11/2009";
DateTime date = DateTime.Parse(this.Text);</code>

By specifying the format in the second parameter, PARSEEEXACT () can ensure the correct analysis of the string.

<code class="language-csharp">DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", null);</code>

iFormatprovider and its usage

iFormatprovider parameter allows the use of a custom format provider to cover the default regional settings. However, in this example, because the expected format has been clearly specified in the string conversion, there is no need to customize the procedure for custom formats.

The difference between PARSE and PARSEEEXACT

Parse:

Try to use the default format based on the current regional settings to resolve the string to the DateTime object. It may not be strict enough, even if the strings do not match the expected format, it may be successfully parsed.

• Parseexact: You need to specify the format to ensure stricter conversion. If the string does not match the specified format, it will cause abnormalities.
• Performance and type of safety considerations Both methods can solve the problem, but PARSEEEXACT () is usually safer and clearer. It clearly states the expected format. If there are any inconsistencies, it is easier to debug.

In terms of performance, both methods are similar. In some cases, PARSE () may be slightly faster, but this can usually be ignored.

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