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Code Analyzer based on Omnisharp

There is a newer version: 1.26.0.100277

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Why is this an issue?
StringBuilder is more efficient than string concatenation, especially when the operator is repeated over and over as in loops.
Noncompliant code example
string str = "";
for (int i = 0; i < arrayOfStrings.Length ; ++i)
{
  str = str + arrayOfStrings[i];
}

Compliant solution
StringBuilder bld = new StringBuilder();
for (int i = 0; i < arrayOfStrings.Length; ++i)
{
  bld.Append(arrayOfStrings[i]);
}
string str = bld.ToString();