WPF Slider 0-based Index Display Pattern

Problem Scenario

When displaying collection indices with a slider, internally using 0-based index but displaying as 1-based to users is a common requirement.

Symptoms

• 120 images exist but displayed as "0 / 120" ~ "119 / 120"
• Users expect "1 / 120" ~ "120 / 120"
• Dragging slider to the end doesn't reach the last item

Cause

• If slider's Maximum is set to TotalCount, it exceeds the valid range
• Displaying 0-based index directly confuses users

Solution