[英]How to send a file and form data with HttpClient in C#
如何使用HttpClient
发送文件和表单数据?
我有两种发送文件或表单数据的方法。 但我想像 HTML 表单一样发送两者。 我怎样才能做到这一点? 谢谢。
这是我的代码:
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
var client = new HttpClient();
var requestContent = new MultipartFormDataContent();
filename = openFileDialog1.FileName;
array = File.ReadAllBytes(filename);
var imageContent = new ByteArrayContent(array);
imageContent.Headers.ContentType = MediaTypeHeaderValue.Parse("audio/*");
requestContent.Add(imageContent, "audio", "audio.wav");
var values = new Dictionary<string, string>
{
{ "token", "b53b99534a137a71513548091271c44c" },
};
var content = new FormUrlEncodedContent(values);
requestContent.Add(content);
var response = await client.PostAsync("localhost", requestContent);
var responseString = await response.Content.ReadAsStringAsync();
txtbox.Text = responseString.ToString();
}
这是我用来发布表单信息和 csv 文件的代码
using (var httpClient = new HttpClient())
{
var surveyBytes = ConvertToByteArray(surveyResponse);
httpClient.DefaultRequestHeaders.Add("X-API-TOKEN", _apiToken);
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var byteArrayContent = new ByteArrayContent(surveyBytes);
byteArrayContent.Headers.ContentType = MediaTypeHeaderValue.Parse("text/csv");
var response = await httpClient.PostAsync(_importUrl, new MultipartFormDataContent
{
{new StringContent(surveyId), "\"surveyId\""},
{byteArrayContent, "\"file\"", "\"feedback.csv\""}
});
return response;
}
这适用于 .net 4.5。
注意 MultipartFormDataContent 中的 \\"。MultipartFormDataContent 中有一个错误。
在 4.5.1 MultipartFormDataContent 用正确的引号包装数据。
更新:由于 Microsoft Connect 已停用,此错误链接不再有效。
这是我使用一种方法将文件和数据从控制台发送到 API 的代码
static async Task uploaddocAsync()
{
MultipartFormDataContent form = new MultipartFormDataContent();
Dictionary<string, string> parameters = new Dictionary<string, string>();
//parameters.Add("username", user.Username);
//parameters.Add("FullName", FullName);
HttpContent DictionaryItems = new FormUrlEncodedContent(parameters);
form.Add(DictionaryItems, "model");
try
{
var stream = new FileStream(@"D:\10th.jpeg", FileMode.Open);
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(@"http:\\xyz.in");
HttpContent content = new StringContent("");
content.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "uploadedFile1",
FileName = "uploadedFile1"
};
content = new StreamContent(stream);
form.Add(content, "uploadedFile1");
client.DefaultRequestHeaders.Add("Authorization", "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.dsfdsfdsfdsfsdfkhjhjkhjk.vD056hXETFMXYxOaLZRwV7Ny1vj-tZySAWq6oybBr2w");
var response = client.PostAsync(@"\api\UploadDocuments\", form).Result;
var k = response.Content.ReadAsStringAsync().Result;
}
catch (Exception ex)
{
}
}
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