将JSON发布到ActionFilterAttribute
将JSON发布到ActionFilterAttribute
提问于 2021-11-18 06:45:13
我正在用C# .Net4.8编写客户端和API。我是来自客户端的POSTing数据，并且在端点方法上有一个ActionFilterAttribute。我想在POSTed方法中读取ActionFilterAttribute数据。我发现我能够使用FormUrlEncodedContent发布表单数据，并且它是被接收的，但是当我尝试使用POSTing JSON数据时，它是不被接收的。
如何更改客户端代码或API代码以正确发布JSON？
POSTing表单数据是这样工作的：
HttpClientHandler handler = new HttpClientHandler()
HttpClient httpClient = new HttpClient(handler);
FormUrlEncodedContent formString = new FormUrlEncodedContent(data);
response = httpClient.PostAsync(url, formString).Result; // run synchronously然后在API端，填充dataFromClient：
public class myFilter : ActionFilterAttribute
{
public string Feature { get; set; }
public myFilter(string feature)
{
this.Feature = feature;
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
string dataFromClient = (HttpContext.Current.Request.Params["dataFromClient"] == null) ? "" : HttpContext.Current.Request.Params["dataFromClient"];
// do other stuff with dataFromClient here
}
}像这样的POSTing JSON数据不起作用：
HttpClientHandler handler = new HttpClientHandler()
HttpClient httpClient = new HttpClient(handler);
StringContent stringContent = new StringContent(jsonString, System.Text.Encoding.UTF8, "application/json");
response = httpClient.PostAsync(url, stringContent).Result; // run synchronously使用此方法，API中的dataFromClient为空。
回答 1
Stack Overflow用户
发布于 2021-11-18 15:54:36
由于您正在发布application/json，所以您应该阅读请求正文。我想，这是你想要的；
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
var request = filterContext.HttpContext.Request;
var initialBody = request.Body;
try
{
request.EnableRewind();
using (StreamReader reader = new StreamReader(request.Body))
{
string dataFromClient = reader.ReadToEnd();
// do other stuff with dataFromClient here
return dataFromClient;
}
}
finally
{
request.Body = initialBody;
}
filterContext.Request.Body.Position = 0
return string.Empty;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70015542
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