Modify rule S2997: LaYC format (#2353)

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Mary Georgiou 2023-07-03 15:18:16 +02:00 committed by GitHub
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"defaultQualityProfiles": [
"Sonar way"
],
"quickfix": "unknown"
"quickfix": "infeasible"
}

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== Why is this an issue?
Typically you want to use ``++using++`` to create a local ``++IDisposable++`` variable; it will trigger disposal of the object when control passes out of the block's scope. The exception to this rule is when your method returns that ``++IDisposable++``. In that case ``++using++`` disposes of the object before the caller can make use of it, likely causing exceptions at runtime. So you should either remove ``++using++`` or avoid returning the ``++IDisposable++``.
When you use a https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/statements/using[`using` statement], the goal is to ensure the correct disposal of an https://learn.microsoft.com/en-us/dotnet/api/system.idisposable[`IDisposable`] instance when the control leaves the `using` statement block.
If you return that `IDisposable` instance inside the block, `using` will dispose it before the caller can use it, likely causing exceptions at runtime. You should either remove `using` statement or avoid returning the `IDisposable` in the `using` statement block.
=== Noncompliant code example
== How to fix it
[source,text]
=== Code examples
==== Noncompliant code example
[source,csharp,diff-id=1,diff-type=noncompliant]
----
public FileStream WriteToFile(string path, string text)
{
using (var fs = File.Create(path)) // Noncompliant
using (var fs = File.Create(path)) // Noncompliant: 'fs' is disposed at the end of the using scope
{
var bytes = Encoding.UTF8.GetBytes(text);
fs.Write(bytes, 0, bytes.Length);
return fs;
return fs;
}
}
----
=== Compliant solution
==== Compliant solution
[source,text]
[source,csharp,diff-id=1,diff-type=compliant]
----
public FileStream WriteToFile(string path, string text)
{
var fs = File.Create(path);
var bytes = Encoding.UTF8.GetBytes(text);
fs.Write(bytes, 0, bytes.Length);
return fs;
return fs; // Compliant: 'fs' is not disposed once the end of the scope is reached and the caller can use it
}
----
== Resources
=== Documentation
* Microsoft Learn - https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/statements/using[using statement - ensure the correct use of disposable objects]
* Microsoft Learn - https://learn.microsoft.com/en-us/dotnet/api/system.idisposable[IDisposable]