CODEWITHSUNDEEP
c#asp.net
Green Developer
Green Developer

Reputation: 187

Strings, Decimals and Null in C#

I have the code snippet below that I am trying to work with. 

decimal preTestAir = decimal.Parse(AirPreTestTextBox.Value);

preTestAir is a decimal and needs to remain a decimal for being sent to the database. This cannot change. What I am trying to do is determine if AirPreTestTextBox.Value is null, if it is, assign it the decimal value of 0.00 and then assign it to the decimal preTestAir. The code above works great as long as there is some numeric value in the text box. What if there isn't a value in the text box? The app crashes. How can I determine if AirPreTestTextBox.Value is null and assign a value if it is all in one line? The reason for the one line is because I have almost 100 lines of code that will need to be formatted in this fashion. I've tried using operators like ?? which won't work with decimals that aren't the nullable type. Can anyone help? Any and all help is appreciated!

Upvotes: 1

Views: 3070

Answers (4)

BradleyDotNET
BradleyDotNET

Reputation: 61349

Easy enough with a ternary.

decimal preTestAir = String.IsNullOrEmpty(AirPreTestTextBox.Value) ? 0 : decimal.Parse(AirPreTestTextBox.Value);

Its very unlikely that a text box would hold a null string, its much more likely that its empty.

Upvotes: 4

Keith Nicholas
Keith Nicholas

Reputation: 44298

just use try parse.... it will handle any non convertible to decimal

decimal preTestAir;
if(!deciaml.TryParse(AirPreTestTextBox.Value, out preTestAir))
{
  // handle the fact it couldn't convert if you like...
}

Upvotes: 1

sfuqua
sfuqua

Reputation: 5853

The null coalescing operator (??) is your friend here. Use 

(AirPreTestTextBox.Value ?? "0.00")

Upvotes: 4

Selman Genç
Selman Genç

Reputation: 101691

You can simply use the conditional operator:

decimal preTestAir = AirPreTestTextBox.Value == null ? 
                     0.0m :
                     decimal.Parse(AirPreTestTextBox.Value);

Upvotes: 4

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