327 
public static async Task<string> GetData(string url, string data)
{
    UriBuilder fullUri = new UriBuilder(url);

    if (!string.IsNullOrEmpty(data))
        fullUri.Query = data;

    HttpClient client = new HttpClient();

    HttpResponseMessage response = await client.PostAsync(new Uri(url), /*expects HttpContent*/);

    response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    response.EnsureSuccessStatusCode();
    string responseBody = await response.Content.ReadAsStringAsync();

    return responseBody;
}

PostAsync需要另一个HttpContent参数。

我该如何设置HttpContent？没有适用于 Windows Phone 8 的文档。

如果我这样做GetAsync，效果很好！但它需要与 key="bla", something="yay" 的内容一起发布

//编辑

非常感谢您的回答......这很好用，但这里仍然有一些不确定：

    public static async Task<string> GetData(string url, string data)
    {
        data = "test=something";

        HttpClient client = new HttpClient();
        StringContent queryString = new StringContent(data);

        HttpResponseMessage response = await client.PostAsync(new Uri(url), queryString );

        //response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        response.EnsureSuccessStatusCode();
        string responseBody = await response.Content.ReadAsStringAsync();

        return responseBody;
    }

我假设的数据“test=something”会在 api 端作为发布数据“test”获取，显然它不会。另一方面，我可能需要通过发布数据发布整个对象/数组，所以我认为 json 最好这样做。关于如何获取发布数据的任何想法？

也许是这样的：

class SomeSubData
{
    public string line1 { get; set; }
    public string line2 { get; set; }
}

class PostData
{
    public string test { get; set; }
    public SomeSubData lines { get; set; }
}

PostData data = new PostData { 
    test = "something",
    lines = new SomeSubData {
        line1 = "a line",
        line2 = "a second line"
    }
}
StringContent queryString = new StringContent(data); // But obviously that won't work
4

3 回答 3

207

这在Can't find how to use HttpContent的一些答案以及这篇博文中得到了解答。

总之，不能直接设置的实例，HttpContent因为它是一个抽象类。您需要根据需要使用从它派生的类之一。最有可能StringContent，它允许您在构造函数中设置响应的字符串值、编码和媒体类型。请参阅：http: //msdn.microsoft.com/en-us/library/system.net.http.stringcontent.aspx

于 2013-09-24T01:57:02.900 回答
135

HttpContent要添加到 Preston 的答案，这里是标准库中可用的派生类的完整列表：

信用：https://pfelix.wordpress.com/2012/01/16/the-new-system-net-http-classes-message-content/

信用：https ://pfelix.wordpress.com/2012/01/16/the-new-system-net-http-classes-message-content/

还有一个假设的ObjectContent，但我无法在ASP.NET Core.

当然，您可以将整个HttpContent内容连同Microsoft.AspNet.WebApi.Client扩展一起跳过（您现在必须进行导入才能使其在 ASP.NET Core 中工作：https ://github.com/aspnet/Home/issues/1558 ) 然后您可以执行以下操作：

var response = await client.PostAsJsonAsync("AddNewArticle", new Article
{
    Title = "New Article Title",
    Body = "New Article Body"
});
于 2017-02-21T23:36:28.047 回答
21 
    public async Task<ActionResult> Index()
    {
        apiTable table = new apiTable();
        table.Name = "Asma Nadeem";
        table.Roll = "6655";

        string str = "";
        string str2 = "";

        HttpClient client = new HttpClient();

        string json = JsonConvert.SerializeObject(table);

        StringContent httpContent = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

        var response = await client.PostAsync("http://YourSite.com/api/apiTables", httpContent);

        str = "" + response.Content + " : " + response.StatusCode;

        if (response.IsSuccessStatusCode)
        {       
            str2 = "Data Posted";
        }

        return View();
    }
于 2021-02-26T22:07:25.670 回答