नोट
इस पृष्ठ तक पहुंच के लिए प्राधिकरण की आवश्यकता होती है। आप साइन इन करने या निर्देशिकाएँ बदलने का प्रयास कर सकते हैं।
इस पृष्ठ तक पहुंच के लिए प्राधिकरण की आवश्यकता होती है। आप निर्देशिकाएँ बदलने का प्रयास कर सकते हैं।
| Property | Value |
|---|---|
| Rule ID | IDE0019 |
| Title | Use pattern matching to avoid as followed by a null check |
| Category | Style |
| Subcategory | Language rules (pattern matching preferences) |
| Applicable languages | C# |
| Options | csharp_style_pattern_matching_over_as_with_null_check |
Overview
This style rule concerns the use of C# pattern matching over an as expression followed by a null check. This rule is similar to IDE0260, which flags the use of an as expression followed by a member read through the null-conditional operator.
Options
The associated option for this rule specifies whether to prefer pattern match or an as expression with null checks to determine if something is of a particular type.
For more information about configuring options, see Option format.
csharp_style_pattern_matching_over_as_with_null_check
This option also configures rule IDE0260.
| Property | Value | Description |
|---|---|---|
| Option name | csharp_style_pattern_matching_over_as_with_null_check | |
| Option values | true |
Prefer pattern matching to determine if something is of a particular type |
false |
Prefer as expressions with null checks to determine if something is of a particular type |
|
| Default option value | true |
// csharp_style_pattern_matching_over_as_with_null_check = true
if (o is string s) {...}
// csharp_style_pattern_matching_over_as_with_null_check = false
var s = o as string;
if (s != null) {...}
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 IDE0019
// The code that's violating the rule is on this line.
#pragma warning restore IDE0019
To disable the rule for a file, folder, or project, set its severity to none in the configuration file.
[*.{cs,vb}]
dotnet_diagnostic.IDE0019.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
GitHub पर हमारे साथ सहयोग करें
इस सामग्री का स्रोत GitHub पर पाया जा सकता है, जहां आप मुद्दों को बना सकते हैं और उनकी समीक्षा भी कर सकते हैं और अनुरोध खींच सकते हैं। अधिक जानकारी के लिए, हमारी योगदानकर्ता मार्गदर्शिका देखें।
