CRR0016 - Method call's return value is ignored

• Jun 26, 2019

This analyzer detects calls to non-void methods where the return value is not considered. Normally, if a method returns data, you should check or save the output. Consider the following example.

C#

string s = "(10.2, 381.8)";
s.Replace(",", ";"); // CRR0016

VB.NET

Dim s As String = "(10.2, 381.8)"
s.Replace(",", ";") ' CRR0016

In this code, the programmer expects that the Replace method modifies the source string. Since it is not so, the statement is useless and should be changed as follows.

C#

string s = "(10.2, 381.8)";
s = s.Replace(",", ";");

VB.NET

Dim s As String = "(10.2, 381.8)"
s = s.Replace(",", ";")