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[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
采用另一个需要为HttpContent
参数。
如何设置HttpContent
? 任何地方都没有适用于 Windows Phone 8 的文档。
如果我做GetAsync
,它工作得很好! 但它需要使用 key="bla", something="yay" 的内容进行 POST
//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;
}
我认为数据“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
这在Can't find how to use HttpContent以及这篇博文 的一些答案中得到了解答。
总之,你不能直接设置HttpContent
的实例,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。 最有可能的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
要添加到 Preston 的答案,以下是标准库中可用的HttpContent
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/
还有一个假设的ObjectContent
但我无法在ASP.NET Core
找到它。
当然,您可以与Microsoft.AspNet.WebApi.Client
扩展一起跳过整个HttpContent
内容(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"
});
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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