How Can I Safely Parse an Empty String or Invalid Input to an Integer in C#?

Handling Empty Input for Integer Parsing

When attempting to parse an empty string using int.Parse, you may encounter the error: "Input string was not in a correct format." This occurs because an empty string does not represent a valid integer.

Alternative Approaches

To address this issue, several options are available:

1. Default to 0 on Empty Input (with Exception for Invalid Formats):

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

This code checks if the text is empty and, if so, assigns 0 to the i variable. Otherwise, it parses the text to an integer as usual. However, any non-integer input will still cause an exception.

2. Default to 0 with Any Invalid Input:

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

This approach uses int.TryParse to attempt to parse the text to an integer. If successful, the result is assigned to the i variable. If the text is empty or contains non-integer data, i is set to 0. This method tolerates all invalid input without throwing an exception.

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