Question

我正在尝试使用HttpClient调用一个端点。请求数据格式为XML。这是代码

    HttpResponseMessage httpResponseMessage = new HttpResponseMessage();

    string fullURL = $"{_baseAPISettings.Value.BaseURL}{_blackListAPISettings.Value.APIEndpoint}";

    using var requestMessage = new HttpRequestMessage(HttpMethod.Post, fullURL);
    _client.DefaultRequestHeaders.Add(AppConstants.SOAPHeader, AppConstants.SOAPHEaderValue);
           
    string authorizationInfo = Convert.ToBase64String(Encoding.Default.GetBytes($"{_baseAPISettings.Value.User} : {_baseAPISettings.Value.Password}"));
    requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Basic", authorizationInfo);

    _client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(AppConstants.TextXML));

    string requestXMLDocument = _httpRequestXMLCreator.CreateBlackListXMLRequestObject(playerCPR);
    requestMessage.Content = new StringContent(requestXMLDocument, Encoding.UTF8, AppConstants.TextXML);

    httpResponseMessage = await _client.PostAsXmlAsync(fullURL, requestMessage);

这段代码产生了上面的错误，到目前为止我还不能理解它只在JSON中工作。。。有什么帮助吗？

System.Runtime.Serialization.InvalidDataContractException：无法序列化类型System.Net.Http.StringContent。请考虑使用DataContractAttribute属性标记它，并使用DataMemberAttribute属性标记要序列化的所有成员。或者，您可以确保该类型是公共的，并且具有无参数构造函数——然后将序列化该类型的所有公共成员，并且不需要任何属性

Answer 1

更改以下代码

httpResponseMessage = await _client.PostAsXmlAsync(fullURL, requestMessage);

到

httpResponseMessage = await _client.PostAsXmlWithSerializerAsync(fullURL, requestMessage);

We need 到 create a cus到m extension method which explicitly specifies 到 use XmlSerializer.

public static class HttpExtensions
{
    public static Task<HttpResponseMessage> PostAsXmlWithSerializerAsync<T>(this HttpClient client, Uri requestUri, T value, CancellationToken cancellationToken)
    {
        return client.PostAsync(requestUri, value,
                      new XmlMediaTypeFormatter { UseXmlSerializer = true },
                      cancellationToken);
    }
}

友情链接