Lambda expression cannot have 'params' parameter

• Jun 26, 2019

CodeRush Classic shows the Lambda expression cannot have ‘params’ parameter code issue if a lambda expression has a params parameter.

Fix

Remove the params keyword from the lambda expression.

Purpose

Highlights the lambda expressions, which would cause compilation errors due to the use of the params keyword.

Example

C#

Func<string[], string> GetLongestItem = (params string[] │strings) =>
{
    string result = string.Empty;
    foreach (string str in strings)
        if (str.Length > result.Length)
            result = str;
    return result;
};

Fix:

C#

Func<string[], string> GetLongestItem = strings =>;
{
    string result = string.Empty;
    foreach (string str in strings)
        if (str.Length > result.Length)
            result = str;
    return result;
};