[英]How do I set up HttpClient PostAsync to call a new web browser
[英]How do I set up HttpContent for my HttpClient PostAsync second parameter?
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
采用另一個需要為HttpContent
參數。
如何設置HttpContent
? 任何地方都沒有適用於 Windows Phone 8 的文檔。
如果我做GetAsync
,它工作得很好! 但它需要使用 key="bla", something="yay" 的內容進行 POST
//編輯
非常感謝您的回答......這很好用,但這里仍然有一些不確定:
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;
}
我認為數據“test=something”會在 api 端作為發布數據“test”獲取,顯然它不會。 另一方面,我可能需要通過發布數據發布整個對象/數組,所以我認為 json 最好這樣做。 關於如何獲取發布數據的任何想法?
也許是這樣的:
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
這在Can't find how to use HttpContent以及這篇博文 的一些答案中得到了解答。
總之,你不能直接設置HttpContent
的實例,因為它是一個抽象類。 您需要根據需要使用從它派生的類之一。 最有可能的StringContent
,它允許您在構造函數中設置響應的字符串值、編碼和媒體類型。 請參閱: http : //msdn.microsoft.com/en-us/library/system.net.http.stringcontent.aspx
要添加到 Preston 的答案,以下是標准庫中可用的HttpContent
派生類的完整列表:
信用: https : //pfelix.wordpress.com/2012/01/16/the-new-system-net-http-classes-message-content/
還有一個假設的ObjectContent
但我無法在ASP.NET Core
找到它。
當然,您可以與Microsoft.AspNet.WebApi.Client
擴展一起跳過整個HttpContent
內容(您現在必須進行導入才能使其在 ASP.NET Core 中工作: https : //github.com /aspnet/Home/issues/1558 ),然后您可以執行以下操作:
var response = await client.PostAsJsonAsync("AddNewArticle", new Article
{
Title = "New Article Title",
Body = "New Article Body"
});
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();
}
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