How to Safely Parse Empty Strings into Integers in C#?

Parsing Empty Strings with int.Parse

When attempting to parse an empty string using int.Parse(), an exception is thrown indicating that the input string is not in a correct format. This error occurs because the int.Parse() method expects a valid numeric string, and an empty string does not fulfill this requirement.

Handling Empty Strings

To handle empty strings and prevent the exception from being thrown, you can implement one of the following approaches:

1. Default to 0 on Empty Strings:

If you want to default the parsed value to 0 when the input string is empty, you can use the following code:

int i = string.IsNullOrEmpty(Textbox1.Text) ? 0 : int.Parse(Textbox1.Text);

In this code, the string.IsNullOrEmpty() check ensures that the string is either empty or null. If it is, the i variable is assigned the value 0. Otherwise, i is assigned the parsed value of Textbox1.Text.

2. Default to 0 on Parsing Errors:

If you want to default the parsed value to 0 whenever the input string cannot be parsed, regardless of whether the string is empty or not, you can use the int.TryParse() method:

int i;
if (!int.TryParse(Textbox1.Text, out i)) i = 0;

The int.TryParse() method returns a bool indicating whether the parsing was successful. If the parsing fails, the i variable is assigned the value 0.

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