Question

使用当前方法，我无法从以下查询字符串中获得正确的结果： / API /数据名称= STORM％202006-1％20A2＆安培;价格类型= CVR

    [HttpGet]
    public IEnumerable<database_WICs> Get([FromUri] Query query)
    {


        var data = from c in db.database_WICs
                   where c.Name == query.name ||
                   c.CUSIP == query.cusip ||
                   c.ISINs == query.isin ||
                   c.Cover == query.price_type 
                   select c;
        return data.ToList();
    }

使用linq查询是否有更好的方法来实现此过滤器。如果是这样，任何例子将非常感谢。

Answer 1

我想你有一个名为Query的模型和一个名为Data的API控制器，如下所示：

public class Query
{
    public string name { get; set; }
    public string cusip { get; set; }
    public string isin { get; set; }
    public string price_type { get; set; }
}

public class DataController : ApiController
{
    //GET api/Data
    public IEnumerable<database_WICs> Get([FromUri] Query query)
    {   
        var data = from c in db.database_WICs
                   where c.Name == query.name ||
                   c.CUSIP == query.cusip ||
                   c.ISINs == query.isin ||
                   c.Cover == query.price_type 
                   select c;
        return data;
    }
}

您的API GET方法很好，只需删除“toList（）”即可。如果您希望它返回HttpResponseMessage，您可以更改它，如下所示：

    //GET api/Data
    public HttpResponseMessage Get([FromUri] Query query)
    {
       var data = from c in db.database_WICs
                           where c.Name == query.name ||
                           c.CUSIP == query.cusip ||
                           c.ISINs == query.isin ||
                           c.Cover == query.price_type 
                           select c;
        if (!data.Any())
        {
           var message = string.Format("No database_WICs was found");
           return Request.CreateErrorResponse(HttpStatusCode.NotFound, message);
        }
        return Request.CreateResponse(HttpStatusCode.OK, data);
    }

但问题是你的URI错了。 URI应如下所示：

/api/Data/?name=STORM&cusip=20&isin=2006-1%20A2&price_type=cvr

如果您通过AJAX调用将JSON对象传递给Web API，则AJAX调用应如下所示：

var data =  {name:"STORM",cusip:"20",isin:"2006-1 20A2",price_type:"cvr"} ;
$.ajax({
    url: "/api/Data/",
    type: 'GET',
    contentType: 'application/json',
    data: JSON.stringify(data)         
    });

Answer 2

我设法使用上面的Lin解决方案提出了搜索名称和价格类型等参数的解决方案：

        public HttpResponseMessage Get([FromUri] Query query)
        {
        var data = db.database_Dwic.AsQueryable();

        if (query.name != null)
        {
            data = data.Where(c => c.Name.Trim() == query.name);    
        }

        if (query.price_type != null)
        {
            data = data.Where(c => c.Cover == query.price_type);
        }

        if (!data.Any()) 
        {
            var message = string.Format("No data was found");
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, message);
        }

        return Request.CreateResponse(HttpStatusCode.OK, data);
        }

如何构建[fromuri]方法？

2 个答案: