如何在Windows Phone 8的HttpClient请求中发送Post正文

本文关键字：请求 正文 Post HttpClient Windows Phone | 更新日期: 2023-09-27 18:16:42

我已经写了下面的代码来发送头，post参数。问题是我正在使用SendAsync，因为我的请求可以是GET或POST。我如何将POST Body添加到这段代码中，以便如果有任何POST Body数据它被添加到我所做的请求中，如果它的简单GET或POST没有Body，它会以这种方式发送请求。请更新以下代码:

HttpClient client = new HttpClient();
// Add a new Request Message
HttpRequestMessage requestMessage = new HttpRequestMessage(RequestHTTPMethod, ToString());
// Add our custom headers
if (RequestHeader != null)
{
    foreach (var item in RequestHeader)
    {
        requestMessage.Headers.Add(item.Key, item.Value);
    }
}
// Add request body

// Send the request to the server
HttpResponseMessage response = await client.SendAsync(requestMessage);
// Get the response
responseString = await response.Content.ReadAsStringAsync();

如何在Windows Phone 8的HttpClient请求中发送Post正文

UPDATE 2:

来自@Craig Brown:

从。net 5开始，你可以这样做:
requestMessage.Content = JsonContent.Create(new { Name = "John Doe", Age = 33 });

参见JsonContent类文档

更新1:

哦，它可以更好(从这个答案):

requestMessage.Content = new StringContent("{'"name'":'"John Doe'",'"age'":33}", Encoding.UTF8, "application/json");

这取决于你有什么内容。你需要用新的HttpContent初始化你的requestMessage.Content属性。例如:

...
// Add request body
if (isPostRequest)
{
    requestMessage.Content = new ByteArrayContent(content);
}
...

其中content是您的编码内容。您还应该包含正确的内容类型头。

我以以下方式实现它。我想要一个通用的MakeRequest方法，它可以调用我的API并接收请求主体的内容-并且还将响应反序列化为所需的类型。我创建了一个Dictionary<string, string>对象来存放要提交的内容，然后用它设置HttpRequestMessage Content属性:

调用API的泛型方法: 
    private static T MakeRequest<T>(string httpMethod, string route, Dictionary<string, string> postParams = null)
    {
        using (var client = new HttpClient())
        {
            HttpRequestMessage requestMessage = new HttpRequestMessage(new HttpMethod(httpMethod), $"{_apiBaseUri}/{route}");
            if (postParams != null)
                requestMessage.Content = new FormUrlEncodedContent(postParams);   // This is where your content gets added to the request body

            HttpResponseMessage response = client.SendAsync(requestMessage).Result;
            string apiResponse = response.Content.ReadAsStringAsync().Result;
            try
            {
                // Attempt to deserialise the reponse to the desired type, otherwise throw an expetion with the response from the api.
                if (apiResponse != "")
                    return JsonConvert.DeserializeObject<T>(apiResponse);
                else
                    throw new Exception();
            }
            catch (Exception ex)
            {
                throw new Exception($"An error ocurred while calling the API. It responded with the following message: {response.StatusCode} {response.ReasonPhrase}");
            }
        }
    }

调用

    public static CardInformation ValidateCard(string cardNumber, string country = "CAN")
    { 
        // Here you create your parameters to be added to the request content
        var postParams = new Dictionary<string, string> { { "cardNumber", cardNumber }, { "country", country } };
        // make a POST request to the "cards" endpoint and pass in the parameters
        return MakeRequest<CardInformation>("POST", "cards", postParams);
    }

我确实创建了一个方法:

public static StringContent GetBodyJson(params (string key, string value)[] param)
    {
        if (param.Length == 0)
            return null;
        StringBuilder builder = new StringBuilder();
        builder.Append(" { ");
        foreach((string key, string value) in param)
        {
            builder.Append(" '"" + key + "'" :"); // key
            builder.Append(" '"" + value + "'" ,"); // value
        }
        builder.Append(" } ");
        return new StringContent(builder.ToString(), Encoding.UTF8, "application/json");
    }

obs:在HttpContent中使用StringContent，继承的是StringContent ->ByteArrayContent→HttpContent .

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