Use params and char overload

[ThomasGoulet73]

Description

Uses the single char overload instead of the one using char array.

Note: PresentationBuildTasks targets .Net Framework 4.7.2 and .Net Core 2.1. The method string.Split(char) was introduced in .Net Core 2.0 so the changes do not apply to .Net Framework. .Net Framework 4.7.2 will call string.Split(params char[]) and .Net Core 2.1 will call string.Split(char).

Thoses changes should give a small perf gain and reduce memory usage.

Here is the result for the method string.Split on my machine:

Method	str	Mean	Error	StdDev	Ratio	Gen 0	Gen 1	Gen 2	Allocated
CharArray	123456789,123456789	55.03 ns	0.562 ns	0.469 ns	1.00	0.0242	-	-	152 B
Char	123456789,123456789	51.92 ns	0.193 ns	0.162 ns	0.94	0.0191	-	-	120 B
CharArray	123456789123456789	26.66 ns	0.157 ns	0.131 ns	1.00	0.0102	-	-	64 B
Char	123456789123456789	23.84 ns	0.081 ns	0.076 ns	0.89	0.0051	-	-	32 B

Customer Impact

Regression

Testing

Risk

There is a risk that the behavior for the method overload using char array is not the same as the one using a single char but since those method are in the BCL, I think the risk is very low.