Here is benchmark results for str == "" vs str.Length == 0
.NET Core SDK=3.1.300
[Host] : .NET Core 3.1.4 (CoreCLR 4.700.20.20201, CoreFX 4.700.20.22101), X64 RyuJIT
DefaultJob : .NET Core 3.1.4 (CoreCLR 4.700.20.20201, CoreFX 4.700.20.22101), X64 RyuJIT| Method | Mean | Error | StdDev |
|---|---|---|---|
| Test_1_000_000_EqualityOperator | 15,394,460.9 ns | 302,780.33 ns | 488,933.80 ns |
| Test_1_000_000_StringLength | 10,515,186.1 ns | 123,536.86 ns | 103,158.88 ns |
| Test_1_000_EqualityOperator | 6,535.9 ns | 84.80 ns | 75.18 ns |
| Test_1_000_StringLength | 3,056.8 ns | 33.96 ns | 30.11 ns |
| Test_100_EqualityOperator | 672.1 ns | 7.37 ns | 5.75 ns |
| Test_100_StringLength | 327.1 ns | 3.92 ns | 3.67 ns |
Replace str == "" and str == string.Empty
with str.Length == 0
+it will increase perfomance a little bit -perhaps it is less readable
Also, You can add
# CA1820: Test for empty strings using string length
dotnet_diagnostic.CA1820.severity = error
to avoid using str == "" in the future
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