通过从客户端到web api的字符串列表

Question

客户端应用程序访问web api控制器以获取一组数据，控制器有一个列表作为参数。

static void Main(string[] args) 
{ 

    Program p = new Program(); 
    p.getdata().Wait(); 
} 


public async Task getdata() 
{ 
    List<string> datelist = new List<string>(); 
    datelist.Add("12/05/2017"); 
    datelist.Add("14/05/2017"); 
    datelist.Add("18/05/2017"); 

    HttpClient host = new HttpClient(); 
    host.BaseAddress = new Uri("http://localhost/widgetApi/"); 
    host.DefaultRequestHeaders.Clear(); 
    host.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json")); 
    StringContent content = new StringContent(JsonConvert.SerializeObject(datelist), Encoding.UTF8, "application/json"); 



    HttpResponseMessage response = await host.GetAsync("api/dataAccessApi?"+ datelist); 
    response.EnsureSuccessStatusCode(); 
    if(response.IsSuccessStatusCode) 
    { 

     Console.Read(); 
    } 
} 

控制器是

public HttpResponseMessage Get([FromBody] List<string> dates) 
{ 
    ..... function going here 
} 

我的问题是如何传递datelist到Web API？

Answer 1

GET请求没有BODY，可以使用查询字符串值。 ?dates='{UrlEncoded date}'&dates='{UrlEncoded date}'...

public HttpResponseMessage Get([FromUri] List<string> dates) { 
    //..... function going here 
} 

在客户端，你将需要构造查询字符串，并将其追加到URI

var dates = datelist.Select(d => string.Format("dates={0}", UrlEncode(d)); 
var query = string.Join("&", dates); 
var uri = "api/dataAccessApi?" + query; 

随着UrlEncode看起来像这样

/// <summary>Escape RFC3986 String</summary> 
static string UrlEncode(string stringToEscape) { 
    return stringToEscape != null ? Uri.EscapeDataString(stringToEscape) 
     .Replace("!", "%21") 
     .Replace("'", "%27") 
     .Replace("(", "%28") 
     .Replace(")", "%29") 
     .Replace("*", "%2A") : string.Empty; 
}