我有以下代码：
private static string boundary = "----CustomBoundary" + DateTime.Now.Ticks.ToString("x");
private static async Task<string> Posttest()
{
string servResp = "";
using (var content = new MultipartFormDataContent(boundary))
{
content.Add(new StringContent("105212"),"case-id");
content.Add(new StringContent("1/14/2014"),"dateFrom");
content.Add(new StringContent("1/15/2014"),"dateto");
httpclienthandler handler = new httpclienthandler();
cookieContainer = new CookieContainer();
handler.CookieContainer = cookieContainer;
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post,"http://somewebsite.com/form");
request.Headers.ExpectContinue = false;
request.Content = content;
httpClient = new HttpClient(handler);
HttpResponseMessage response = await httpClient.SendAsync(request);
response.EnsureSuccessstatusCode();
servResp = await response.Content.ReadAsstringAsync();
}
return servResp;
}
当我运行它,我看到在fiddler的Content-Type标题：
Content-Type: multipart/form-data; boundary="----CustomBoundary8d0f01e6b3b5daf"
因为边界值是引号,服务器将忽略请求体.如果我删除引号并在fiddler Composer中运行请求,则请求被正确处理.
我尝试添加内容标题：
//request.Content.Headers.Add("Content-Type","multipart/form-data; boundary=" + boundary);
//request.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("multipart/form-data; boundary=" + boundary);
…但它没有工作,错误消息是：“无法添加值,因为标题”Content-Type“不支持多个值.和“格式的值”multipart / form-data,boundary = —- CustomBoundary8d0f024297b32d5“无效”,相应地.
如何在请求中添加适当的Content-Type标题,以便边界值不会用引号括起来？
Content-Type: multipart/form-data; boundary=----CustomBoundary8d0f01e6b3b5daf
解决方法
通过从MultipartFormDataContent中删除标题并重新添加它而不进行验证来解决此问题：
content.Headers.Remove("Content-Type");
content.Headers.TryAddWithoutValidation("Content-Type","multipart/form-data; boundary=" + boundary);