描述
Description
Hello,
we use slider with this configuration
<Slider
Grid.Row="3"
Grid.Column="1"
IsSnapToTickEnabled="True"
TickFrequency="0.1"
Minimum="{Binding Gamma.Minimum}"
Maximum="{Binding Gamma.Maximum}"
Value="{Binding Gamma.Value}"/>
Gamma.Minimum is 0.5.
Gamma.Maximum is 4.
Gamma.Value is bounded.
All properties are double.
Problem is that when Value is 1.9 and i move slider very little then value does not change to 2 or 1.8 but it changes to 1.9000000000000001 which is not correct. Value should be 2.
I have tried to debug it and I think that I have found problem at this line https://github.com/dotnet/wpf/blob/2fdb74d7b11465f36246b7caf06fa00e9c6d8454/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Controls/Slider.cs#L1135
When * TickFrequency is used value result of multiplication brings precision problem.
Part of the code from the link above.
else if (DoubleUtil.GreaterThanZero(TickFrequency))
{
previous = Minimum + (Math.Round(((value - Minimum) / TickFrequency)) * TickFrequency);
next = Math.Min(Maximum, previous + TickFrequency);
}
Reproduction Steps
Add Slider with binding to double value
<Slider
Grid.Row="3"
Grid.Column="1"
IsSnapToTickEnabled="True"
TickFrequency="0.1"
Minimum="0.5"
Maximum="4"
Value="{Binding Value}"/>
Set value to 1.9 from code.
Try to move slidre a little. See problem.
Expected behavior
- Value should be set to
2.0
Actual behavior
Value is set to 1.9000000000000001.
Regression?
No response
Known Workarounds
No response
Impact
No response
Configuration
No response
Other information
No response