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MA0075 - Do not use implicit culture-sensitive ToString

This rule reports cases where an implicit call to obj.ToString() may differ based on the current culture:

_ = "abc" + -1; // non-compliant as the result depends on the current culture
_ = "abc" + 1; // compliant

_ = "abc" + -1.ToString(CultureInfo.CurrentCulture);   // compliant
_ = "abc" + -1.ToString(CultureInfo.InvariantCulture); // compliant

A given type is considered to have a culture-sensitive ToString() implementation if it implements System.IFormattable.
An exception is made for the following types:

  • Any enum
  • System.Byte
  • System.Char
  • System.Guid
  • System.TimeSpan
  • System.Version
  • System.UInt16
  • System.UInt32
  • System.UInt64
  • System.Windows.FontStretch
  • System.Windows.Media.Brush

In case of the following types, MA0075 is not reported when the operand is a positive (>= 0) constant:

  • System.Int16
  • System.Int32
  • System.Int64
  • System.IntPtr
  • System.SByte

Configuration

# Exclude ToString methods from analysis
MA0075.exclude_tostring_methods=true

# Report Nullable<T>.ToString when T is culture-sensitive
MA0075.consider_nullable_types=true