Skip to content

BSL255 — Cast to number of try catch block

← All rules

Summary

Cast to number of try catch block

Identifiers

Field Value
Rule code BSL255
Compatible alias TryNumber
Severity WARNING
Enabled by default Yes
Implemented Yes
Tags error-handling, suspicious

Behavior

  • The public identifier BSL255 and alias TryNumber are stable.
  • The rule reports the cases documented on this page.
  • Suppressions and project configuration are applied before publication.
  • The rule requires neither an external analyzer nor network access.

Configuration and suppression

BSL### is the primary stable identifier. The compatible alias is accepted in select, ignore, and compatible block suppression comments.

[tool.onec-hbk-bsl]
select = ["BSL255"]
ignore = ["TryNumber"]

All three suppression families support both a current line and a range. When an opening comment follows code, it affects only that line. Use any one form:

  • noqa:
Value = "example";  // noqa: BSL255
  • bsl-disable:
Value = "example";  // bsl-disable: BSL255
  • compatible BSLLS form:
Value = "example";  // BSLLS:TryNumber-off

When the same opening comment is on a line by itself, it starts a range. Close it with the matching marker from the same family:

// noqa: BSL255
// code without this diagnostic
// noqa-enable: BSL255

// bsl-disable: BSL255
// code without this diagnostic
// bsl-enable: BSL255

// BSLLS:TryNumber-off
// code without this diagnostic
// BSLLS:TryNumber-on

To disable the rule until the end of the file, omit the closing noqa-enable, bsl-enable, or BSLLS:…-on marker.

Opening and closing markers must belong to the same family.

Description

It is incorrect to use exceptions to cast a value to a type. For such operations, it is necessary to use the capabilities of the TypeDescription object.

Examples

Incorrect:

Try
 NumberDaysAllowance = Number(Value);
Raise
 NumberDaysAllowance = 0; // default value
EndTry;

Correct:

TypeDescription = New TypeDescription("Number");
NumberDaysAllowance = TypeDescription.CastValue(Value);

Sources