如何将配置文件参数添加到C#中的内容类型标题？

我试图设置我的

HttpClient

Post请求的

content-type

，并使用profile参数，但当我更改内容类型时，会引发异常：

“值'application/json；profile={URL HERE}'的格式为 无效。“

作为参考，我发现了以下问答：

---

如果创建一条HttpRequestMessage并使用client.sendsync（），则可以将参数添加到request.Content.Headers.ContentType.parameters

var client = new HttpClient();
using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://realtime-listings-api.webservices.zpg.co.uk/sandbox/v1/listing/list"))
{
    request.Content = new StringContent("propertyData", Encoding.UTF8, "application/json");
    request.Content.Headers.ContentType.Parameters.Add(
        new NameValueHeaderValue("profile", "http://realtime-listings.webservices.zpg.co.uk/docs/v1.1/schemas/listing/list.json")
        );
    var response = await client.SendAsync(request);
    //Handle response..
}

---

您不需要使用

HttpRequestMessage

，但需要通过NameValueHeaderValue参数将配置文件值添加为带引号的字符串：

var content = new StringContent(request.ToJson(), Encoding.UTF8);
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
content.Headers.ContentType.Parameters.Add(new NameValueHeaderValue("profile", "\"https://realtime-listings.webservices.zpg.co.uk/docs/v1.2/schemas/listing/update.json\""))
httpClient.PostAsync("listing/update", content);

这将绕过

FormatException

。否则你会遇到麻烦

var content = new StringContent(request.ToJson(), Encoding.UTF8);
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
content.Headers.ContentType.Parameters.Add(new NameValueHeaderValue("profile", "\"https://realtime-listings.webservices.zpg.co.uk/docs/v1.2/schemas/listing/update.json\""))
httpClient.PostAsync("listing/update", content);