webapi相关知识

1、从uri中获取参数 ：后端：[FromUri]

2、从uri中获取数组参数：后端：[FromUri]string[] type 前端：type[]=1&type[]=2&type=3

3、从uri中获取List<Key,Value>参数：

后端：[FromUri]List<FilterRequest> filters

/// <summary>
/// 参数对
/// </summary>
public class FilterRequest
{
/// <summary>
/// 参数名
/// </summary>
public string Key { get; set; }
/// <summary>
/// 参数值
/// </summary>
public string Value { get; set; }
}

　　前端：api/smartfind/search?country=us&filters[0].key=color&filters[0].value=red&filters[1].key=color&filters[1].value=black

4、linq to entity 左连接查询 left join

var temp = from m in entity.mediameta
join ma in entity.mediameta_accessory
on m.ID equals ma.MediaMetaID
where ma.PN == pn
&& m.Status == (int)StatusType.Public
&& m.FileType == "png"
join i in entity.imagefacet
on ma.ImageFacetID equals i.ID into facets
  from facet in facets.DefaultIfEmpty()
select new
{
pn = pn,
url = HTTP + m.Url,
imagefacet = facet.Name,
type = m.Type
};

　　5、字符串反序列化为对象

var object= jss.Deserialize<ObjectDto>(str);//直接是对象。传递{"color":"red","Usb":"mirco"}。接收转为

Color{get;set;};Usb{get;set;}
var object= jss.Deserialize<Dictionary<string, string>>(str);//键值对对象。传递&filters={"color":"red","USB":"mirco"}。接收转为

/// <summary>
/// 参数对
/// </summary>
public class FilterRequest
{
/// <summary>
/// 参数名
/// </summary>
public string Key { get; set; }
/// <summary>
/// 参数值
/// </summary>
public string Value { get; set; }
}