How to handle null values in regx.ismatch

Question

0.00/5 (No votes)

See more:

how to handle null values in regx.ismatch

C#

System.Text.RegularExpressions.Regex.IsMatch(business.Cuisine,"chicken", System.Text.RegularExpressions.RegexOptions.IgnoreCase)

if the input null how to handle this regx.ismatch

please help me.
Thank u.

What I have tried:

C#

System.Text.RegularExpressions.Regex.IsMatch(business.Cuisine,"chicken", System.Text.RegularExpressions.RegexOptions.IgnoreCase)

if the input null how to handle this regx.ismatch

Posted 24-Dec-18 1:45am

Krishna Veni

Updated 24-Dec-18 2:07am

Add a Solution

Comments

Patrice T 24-Dec-18 7:54am

What do you need to do with that null input ?

Krishna Veni 24-Dec-18 7:59am

For suppose business.cuisine==null.cuisine access from db.at the time get System.ArgumentNullException occured

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2018-12-24T02:07:00

Check for null before you try and do the regex, just like you do for all other places where a null is possible. In some case, provided you are using a new enough version of C#, you can use the safe navigation operator "?.": At last, C# is getting “?.”, sometimes called the Safe Navigation Operator – Jerry Nixon[^] But you can't here, because IsMatch doesn't like null arguments. Instead, use the null-coalescing operator '??'

C#

Regex.IsMatch(business.Cuisine ?? "","chicken", RegexOptions.IgnoreCase)

Or even:

C#

Regex.IsMatch(business?.Cuisine ?? "","chicken", RegexOptions.IgnoreCase)