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C#

C# static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your C# code

  • All rules 493
  • Vulnerability46
  • Bug88
  • Security Hotspot24
  • Code Smell335

  • Quick Fix 61
Filtered: 8 rules found
async-await
    Impact
      Clean code attribute
        1. Awaitable method should be used

           Code Smell
        2. Calls to "async" methods should not be blocking in Azure Functions

           Code Smell
        3. "ValueTask" should be consumed correctly

           Code Smell
        4. Non-async "Task/Task<T>" methods should not return null

           Bug
        5. Calls to "async" methods should not be blocking

           Code Smell
        6. Parameter validation in "async"/"await" methods should be wrapped

           Code Smell
        7. "ConfigureAwait(false)" should be used

           Code Smell
        8. "async" methods should not return "void"

           Bug

        Parameter validation in "async"/"await" methods should be wrapped

        consistency - conventional
        maintainability
        Code Smell
        • async-await

        Why is this an issue?

        Because of the way async/await methods are rewritten by the compiler, any exceptions thrown during the parameters check will happen only when the task is observed. That could happen far away from the source of the buggy code or never happen for fire-and-forget tasks.

        Therefore it is recommended to split the method into two: an outer method handling the parameter checks (without being async/await) and an inner method to handle the iterator block with the async/await pattern.

        This rule raises an issue when an async method throws any exception derived from ArgumentException and contains await keyword.

        Noncompliant code example

        public static async Task SkipLinesAsync(this TextReader reader, int linesToSkip) // Noncompliant
        {
            if (reader == null) { throw new ArgumentNullException(nameof(reader)); }
            if (linesToSkip < 0) { throw new ArgumentOutOfRangeException(nameof(linesToSkip)); }
        
            for (var i = 0; i < linesToSkip; ++i)
            {
                var line = await reader.ReadLineAsync().ConfigureAwait(false);
                if (line == null) { break; }
            }
        }
        

        Compliant solution

        public static Task SkipLinesAsync(this TextReader reader, int linesToSkip)
        {
            if (reader == null) { throw new ArgumentNullException(nameof(reader)); }
            if (linesToSkip < 0) { throw new ArgumentOutOfRangeException(nameof(linesToSkip)); }
        
            return reader.SkipLinesInternalAsync(linesToSkip);
        }
        
        private static async Task SkipLinesInternalAsync(this TextReader reader, int linesToSkip)
        {
            for (var i = 0; i < linesToSkip; ++i)
            {
                var line = await reader.ReadLineAsync().ConfigureAwait(false);
                if (line == null) { break; }
            }
        }
        
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