Use range operator (IDE0057)
Property | Value |
---|---|
Rule ID | IDE0057 |
Title | Use range operator |
Category | Style |
Subcategory | Language rules (expression-level preferences) |
Applicable languages | C# 8.0+ |
Options | csharp_style_prefer_range_operator |
Overview
This style rule concerns the use of the range operator (..
), which is available in C# 8.0 and later.
Options
Options specify the behavior that you want the rule to enforce. For information about configuring options, see Option format.
csharp_style_prefer_range_operator
Property | Value | Description |
---|---|---|
Option name | csharp_style_prefer_range_operator | |
Option values | true |
Prefer to use the range operator .. when extracting a "slice" of a collection |
false |
Prefer not to use the range operator .. when extracting a "slice" of a collection |
|
Default option value | true |
// csharp_style_prefer_range_operator = true
string sentence = "the quick brown fox";
var sub = sentence[0..^4];
// csharp_style_prefer_range_operator = false
string sentence = "the quick brown fox";
var sub = sentence.Substring(0, sentence.Length - 4);
Suppress a warning
If you want to suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the rule.
#pragma warning disable IDE0057
// The code that's violating the rule is on this line.
#pragma warning restore IDE0057
To disable the rule for a file, folder, or project, set its severity to none
in the configuration file.
[*.{cs,vb}]
dotnet_diagnostic.IDE0057.severity = none
To disable all of the code-style rules, set the severity for the category Style
to none
in the configuration file.
[*.{cs,vb}]
dotnet_analyzer_diagnostic.category-Style.severity = none
For more information, see How to suppress code analysis warnings.
See also
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