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TypeName SA1313ParameterNamesMustBeginWithLowerCaseLetter
CheckId SA1313
Category Naming Rules

📝 This rule is new for StyleCop Analyzers, and was not present in StyleCop Classic.


The name of a parameter in C# does not begin with a lower-case letter.

Rule description

A violation of this rule occurs when the name of a parameter does not begin with a lower-case letter.

An exception to this rule is made for lambda parameters named _ and __. These parameters are often used to designate a placeholder parameter which is not actually used in the body of the lambda expression.

If the parameter name is intended to match the name of an item associated with Win32 or COM, and thus needs to begin with an upper-case letter, place the parameter within a special NativeMethods class. A NativeMethods class is any class which contains a name ending in NativeMethods, and is intended as a placeholder for Win32 or COM wrappers. StyleCop will ignore this violation if the item is placed within a NativeMethods class.

How to fix violations

To fix a violation of this rule, change the name of the parameter so that it begins with a lower-case letter, or place the item within a NativeMethods class if appropriate.

How to suppress violations

#pragma warning disable SA1313 // ParameterNamesMustBeginWithLowerCaseLetter
void Method(int Parameter)
#pragma warning restore SA1313 // ParameterNamesMustBeginWithLowerCaseLetter
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