C#反射方法擴展

反射是程式猿的好幫手，有了反射你可以少寫一半的代碼。下麵是一些常用的反射擴展方法。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace LiLi.Util
{
    public static class ReflectionExtension
    {
        public static IEnumerable<string> Keys(this Type type, BindingFlags? propBindingAttr = null, BindingFlags? fieldBindingAttr = null)
        {
            List<string> result = new List<string>();
            result.AddRange(PropertyKeys(type, propBindingAttr));
            result.AddRange(FieldKeys(type, fieldBindingAttr));
            return result;
        }

        public static IEnumerable<string> PropertyKeys(this Type type, BindingFlags? bindingAttr = null)
        {
            PropertyInfo[] props = bindingAttr.HasValue ? type.GetProperties(bindingAttr.Value) : type.GetProperties();
            return props.Select(x => x.Name);
        }

        public static IEnumerable<string> FieldKeys(this Type type, BindingFlags? bindingAttr = null)
        {
            FieldInfo[] fields = bindingAttr.HasValue ? type.GetFields(bindingAttr.Value) : type.GetFields();
            return fields.Select(x => x.Name);
        }

        public static IDictionary<string, object> KeyValueList(this Type type, object obj, BindingFlags? propBindingAttr = null, BindingFlags? fieldBindingAttr = null)
        {
            Dictionary<string, object> result = new Dictionary<string, object>();
            PropertyInfo[] props = propBindingAttr.HasValue ? type.GetProperties(propBindingAttr.Value) : type.GetProperties();
            Array.ForEach(props, x => result.Add(x.Name, x.GetValue(obj)));
            FieldInfo[] fields = fieldBindingAttr.HasValue ? type.GetFields(fieldBindingAttr.Value) : type.GetFields();
            Array.ForEach(fields, x => result.Add(x.Name, x.GetValue(obj)));
            return result;
        }

        public static IDictionary<string, object> PropertyKeyValueList(this Type type, object obj, BindingFlags? bindingAttr = null)
        {
            Dictionary<string, object> result = new Dictionary<string, object>();
            PropertyInfo[] props = bindingAttr.HasValue ? type.GetProperties(bindingAttr.Value) : type.GetProperties();
            Array.ForEach(props, x => result.Add(x.Name, x.GetValue(obj)));
            return result;
        }

        public static IDictionary<string, object> FieldKeyValueList(this Type type, object obj, BindingFlags? bindingAttr = null)
        {
            Dictionary<string, object> result = new Dictionary<string, object>();
            FieldInfo[] fields = bindingAttr.HasValue ? type.GetFields(bindingAttr.Value) : type.GetFields();
            Array.ForEach(fields, x => result.Add(x.Name, x.GetValue(obj)));
            return result;
        }

        public static bool HasKey(this Type type, string key, BindingFlags? propBindingAttr = null, BindingFlags? fieldBindingAttr = null)
        {
            return type.Keys(propBindingAttr, fieldBindingAttr).Contains(key);
        }

        public static object GetValue(this Type type, string key, object obj, BindingFlags? propBindingAttr = null, BindingFlags? fieldBindingAttr = null)
        {
            IDictionary<string, object> propertyKeyValueList = PropertyKeyValueList(type, obj, propBindingAttr);
            if (propertyKeyValueList.ContainsKey(key))
            {
                return propertyKeyValueList[key];
            }
            IDictionary<string, object> fieldKeyValueList = FieldKeyValueList(type, obj, fieldBindingAttr);
            if (fieldKeyValueList.ContainsKey(key))
            {
                return fieldKeyValueList[key];
            }
            return null;
        }
    }
}

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