[筆記] C# 使用 lambda 表達式進行對象的值獲取與賦值

想要實現的效果：

xxxObj.Set(x=>x.Name, name)

如此，就可以實現：由業務方決定將 何值 寫到 何屬性 中。

關鍵代碼

/// <summary>
/// 使用 lambda 表達式設置值
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="target"></param>
/// <param name="memberLambda"></param>
/// <param name="value"></param>
public static void SetPropertyValue<T, TValue>(this T target, Expression<Func<T, TValue>> memberLambda, TValue value)
{
    if (memberLambda.Body is MemberExpression memberSelectorExpression)
    {
        var property = memberSelectorExpression.Member as PropertyInfo;
        if (property != null)
        {
            property.SetValue(target, value);
        }
    }
}

/// <summary>
/// 使用 lambda 表達式設置值
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="target"></param>
/// <param name="memberLambda"></param>
/// <param name="default">沒有獲取到值時的默認值</param>
public static TValue GetPropertyValue<T, TValue>(this T target, Expression<Func<T, TValue>> memberLambda, TValue @default)
{
    if (memberLambda.Body is MemberExpression memberSelectorExpression)
    {
        var property = memberSelectorExpression.Member as PropertyInfo;
        if (property != null)
        {
            return (TValue)property.GetValue(target);
        }
    }    return @default;
}

參考資料

c# - How to set property value using Expressions? - Stack Overflow

原文鏈接：https://www.cnblogs.com/jasongrass/p/14150518.html