xamarin/Xamarin.Forms

[Bug] Data binding an array item of type enum is incorrect

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#5,919 opened on Apr 15, 2019

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a/binding ⛓e/3 :clock3:help wantedinactivet/bug :bug:up-for-grabs

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Description

Description

When binding to a particular index in an array, the result is different that if it was a property.

Steps to Reproduce

Given an enum:

public enum Player {
    Nobody,
    X,
    O
}

And 2 properties:

public Player[] Board { get; }
public Player CurrentPlayer { get; set; }

If I add a databinding:

Text="{Binding CurrentPlayer}"

The value will either be "X", "O" or "Nobody". If I bind to an array item:

Text="{Binding Board[1]}"

The value will be "0", "1", or "2".

Expected Behavior

The array data binding uses .ToString().

Actual Behavior

The array binding uses some integer representation.

Basic Information

  • Version with issue: 3.6.0.293080
  • Last known good version: (not sure)
  • IDE: VS 2019
  • Platform Target Frameworks:
    • iOS:
    • Android:
    • UWP:
  • Android Support Library Version:
  • Nuget Packages:
  • Affected Devices:

Screenshots

Reproduction Link

Contributor guide

Research direction
Investigate the array indexer data binding path in Xamarin.Forms to understand why it returns integer values instead of calling ToString() on enum values. Compare with property binding behavior.
Tech stack
csharp
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C#Xamarin.FormsData Binding
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60