添加MessageHandler后HttpContext为null
本文关键字:null HttpContext MessageHandler 添加 | 更新日期: 2023-09-27 18:27:50
我正在开发一个WebAPI,并收到了如下POST数据:
[HttpPost]
public Int16 Foo()
{
var input = new StreamReader(HttpContext.Current.Request.InputStream).ReadToEnd();
Model_Deserialized model = JsonConvert.DeserializeObject<Model_Deserialized>(input);
...
}
最近我觉得有必要记录所有发送过来的请求。我正在尝试使用上建议的方法http://weblogs.asp.net/fredriknormen/log-message-request-and-response-in-asp-net-webapi但是在执行了这些步骤之后,我的输入变量开始变成一个空字符串。
这就是我的消息处理程序看起来像的样子
public abstract class MessageHandler : DelegatingHandler
{
protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var corrId = string.Format("{0}{1}", DateTime.Now.Ticks, Thread.CurrentThread.ManagedThreadId);
var requestInfo = string.Format("{0} {1}", request.Method, request.RequestUri);
var requestMessage = await request.Content.ReadAsByteArrayAsync();
String ip;
if (request.Properties.ContainsKey("MS_HttpContext"))
{
var ctx = request.Properties["MS_HttpContext"] as HttpContextWrapper;
if (ctx != null)
{
ip = ctx.Request.UserHostAddress;
}
}
else
{
ip = "error";
}
await IncommingMessageAsync(corrId, requestInfo, requestMessage, ip);
var response = await base.SendAsync(request, cancellationToken);
return response;
}
protected abstract Task IncommingMessageAsync(string correlationId, string requestInfo, byte[] message, String ip);
}
这是我的MessageLoggingHandler
public class MessageLoggingHandler : MessageHandler
{
protected override async Task IncommingMessageAsync(string correlationId, string requestInfo, byte[] message, String ip)
{
await Task.Run(() =>
WriteToFile(ip + "{" + correlationId + "} - Request: {" + requestInfo + "}'r'n{" + Encoding.UTF8.GetString(message) + "}"));
}
private void WriteToFile(string text)
{
string path = "C:''Logs''ServiceLog" + DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + ".txt";
using (StreamWriter writer = new StreamWriter(path, true))
{
writer.WriteLine(DateTime.Now.ToString("dd/MM/yyyy hh:mm:ss tt") + "--" + text);
writer.Close();
}
}
}
我还将此添加到我的Global.asax 中
GlobalConfiguration.Configuration.MessageHandlers.Add(new MessageLoggingHandler());
在我的web.config中,我已经尝试添加
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
<compilation debug="true" targetFramework="4.5">
有没有办法坚持这个方法,而不是创建一个日志例程并从每个函数调用它?
需要明确的是,HttpContext
不能为null,它是静态的。那么HttpContext.Current
为空吗?或者我的猜测是HttpContext.Current.Request.InputStream
为空。Webapi会自动读取流并对其进行处理,并将帖子正文反序列化为您的操作输入。因此,您应该将WebApi操作编码为如下内容:
[HttpPost]
public Int16 Foo(Model_Deserialized model)
{
...
}