ASP NET Core --- 资源塑形, HATEOAS, Media Type

参照 草根专栏- ASP.NET Core + Ng6 实战：https://v.qq.com/x/page/d07652pu1zi.html

一、Get返回资源塑形

1、添加集合塑形EnumerableExtensions.cs，单个塑形类ObjectExtensions.cs：

namespace BlogDemo.Infrastructure.Extensions
{
    public static class EnumerableExtensions
    {
        public static IEnumerable<ExpandoObject> ToDynamicIEnumerable<TSource>(this IEnumerable<TSource> source, string fields = null)
        {
            if (source == null)
            {
                throw new ArgumentNullException(nameof(source));
            }

            var expandoObjectList = new List<ExpandoObject>();
            var propertyInfoList = new List<PropertyInfo>();
            if (string.IsNullOrWhiteSpace(fields))
            {
                var propertyInfos = typeof(TSource).GetProperties(BindingFlags.Public | BindingFlags.Instance);
                propertyInfoList.AddRange(propertyInfos);
            }
            else
            {
                var fieldsAfterSplit = fields.Split(',').ToList();
                foreach (var field in fieldsAfterSplit)
                {
                    var propertyName = field.Trim();
                    if (string.IsNullOrEmpty(propertyName))
                    {
                        continue;
                    }
                    var propertyInfo = typeof(TSource).GetProperty(propertyName, BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance);
                    if (propertyInfo == null)
                    {
                        throw new Exception($"Property {propertyName} wasn't found on {typeof(TSource)}");
                    }
                    propertyInfoList.Add(propertyInfo);
                }
            }

            foreach (TSource sourceObject in source)
            {
                var dataShapedObject = new ExpandoObject();
                foreach (var propertyInfo in propertyInfoList)
                {
                    var propertyValue = propertyInfo.GetValue(sourceObject);
                    ((IDictionary<string, object>)dataShapedObject).Add(propertyInfo.Name, propertyValue);
                }
                expandoObjectList.Add(dataShapedObject);
            }

            return expandoObjectList;
        }
    }
}

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