C# Class 具有许多属性和类似的设置器，如何重用逻辑

Question

I have a class with many Properties and public Setters. On each Setter I want to check if the value has changed and if so calling an EventHandler method. The code ended up looking too long, too repetitive and very programmer error prone because I can make small mistake on the multiple setter methods and mess up things.

I would like to ask if there is any way to make this code smaller and more reusable (in case I want to add new Properties for example):

using System;

public class CosmeticsModel
{
    private string _skin;
    public string Skin {
        get => _skin;
        set
        {
            if (value != _skin)
            {
                _skin = value;
                OnCosmeticChanged("Skin", _skin);
            }
        }
    }

    private string _eyes;
    public string Eyes {
        get => _eyes;
        set
        {
            if (value != _eyes)
            {
                _eyes = value;
                OnCosmeticChanged("Eyes", _eyes);
            }
        }
    }

    private string _mouth;
    public string Mouth {
        get => _mouth;
        set
        {
            if (value != _mouth)
            {
                _mouth = value;
                OnCosmeticChanged("Mouth", _mouth);
            }
        }
    }

    private string _accessory;
    public string Accessory {
        get => _accessory;
        set
        {
            if (value != _accessory)
            {
                _accessory = value;
                OnCosmeticChanged("Accessory", _accessory);
            }
        }
    }

    private string _shoes;
    public string Shoes {
        get => _shoes;
        set
        {
            if (value != _shoes)
            {
                _shoes = value;
                OnCosmeticChanged("Shoes", _shoes);
            }
        }
    }

    private string _hat;
    public string Hat {
        get => _hat;
        set
        {
            if (value != _hat)
            {
                _hat = value;
                OnCosmeticChanged("Hat", _hat);
            }
        }
    }

    private string _oneHandedWeapon;
    public string OneHandedWeapon {
        get => _oneHandedWeapon;
        set
        {
            if (value != _oneHandedWeapon)
            {
                _oneHandedWeapon = value;
                OnCosmeticChanged("OneHandedWeapon", _oneHandedWeapon);
            }
        }
    }

    // [... rest of the Class]
}

Answer 1

You can extract a method called SetProperty . You can also make use of CallerMemberName to automatically set the property name.

private void SetProperty(ref string property, string value, [System.Runtime.CompilerServices.CallerMemberName] string propertyName = "") {
    if (value != property)
    {
        property = value;
        OnCosmeticChanged(propertyName, property);
    }
}

Usage:

private string _hat;
public string Hat {
    get => _hat;
    set => SetProperty(ref _hat, value);
}