Do you prefer coding with conditional if statements or using a switch statement or expression? Do you know which is the most performant? A typical conditional if statement might look like this:
public static string GetData(DataType input)
{
var result = string.Empty;
if (input == DataType.CreditCard)
{
result = input.GetDescription();
}
else if (input == DataType.Currency)
{
result = input.GetDescription();
}
else if (input == DataType.Custom)
{
result = input.GetDescription();
}
return result;
}
.NET code analyzers will suggest changing the code above to a switch statement, as shown in this example:
public static string GetData(DataType input)
{
var result = string.Empty;
switch (input)
{
case DataType.CreditCard:
result = input.GetDescription();
break;
case DataType.Currency:
result = input.GetDescription();
break;
case DataType.Custom:
result = input.GetDescription();
break;
default:
break;
}
return result;
}
Starting with C# 8, analyzers will recommend converting a switch statement to a switch expression, as shown below:
public static string GetData(DataType input)
{
var result = input switch
{
DataType.CreditCard => input.GetDescription(),
DataType.Currency => input.GetDescription(),
DataType.Custom => input.GetDescription(),
_ => "UNKOWN"
};
return result;
}
Using a switch expression is more readable and requires less code. Now, let’s examine the performance.
Benchmark Results
In these results, all three methods exhibit similar performance, each allocating 24 bytes in memory.
My recommendation is to use a
switchexpression.
When I setup the code analysis in my EditorConfig it looks like this:
dotnet_diagnostic.IDE0066.severity = warning
csharp_style_prefer_switch_expression = true:warning
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