c# - 将字符串列表从客户端传递到 Web API

Question

客户端应用程序访问一个 web api Controller 来获取一组数据，该 Controller 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();
    }
}

Controller 是

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

我的问题是如何将 datelist 传递给 web api ??

Answer 1

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

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

在客户端，您需要构造查询字符串并将其附加到 Uri

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

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;
}

对于 Asp.Net Core consider to use [FromQuery] 而不是 [FromUri]