Double.ToString with two section separators and negative zero placing additional negative sign in output
#70.460 geöffnet am 8. Juni 2022
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Beschreibung
Description
When using a string format with two section separators and a negative zeroish number when accounting for the limited number of decimal points, there is an additional negative sign added to the output string when there shouldn't be.
Reproduction Steps
Console.WriteLine((-0.001).ToString("+0.00;-0.00")); ,
Expected behavior
Outputs +0.00 on .NET Framework 4.7.2 (-0.00 seems valid as well)
Actual behavior
outputs -+0.00 on dotnet6
Regression?
This worked in .NET Framework 4.7.2.
Known Workarounds
The two-section "+0.00;-0.00" can be replaced by the three-section "+0.00;-0.00;+0.00" and seems to work correctly
Configuration
I've reproduced this in both my local visual studio and dotnetfiddle.net on dotnet 6.
Other information
This seems related to the bug https://github.com/dotnet/runtime/issues/32237 which was an "Closed As Design" due to https://devblogs.microsoft.com/dotnet/floating-point-parsing-and-formatting-improvements-in-net-core-3-0/, but this issue seems like an actual regression since the string format is explicitly calling out how to format positive and negative numbers