C# 记录ASP.NET Web API请求

我编写这个简单的类是为了记录请求属性：

public class Logger : ActionFilterAttribute
{
    private string logPath;

    public Logger()
    {
        System.Configuration.Configuration rootWebConfig =
            System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~\\web.config");
        logPath = rootWebConfig.AppSettings.Settings["logPath"].Value;
    }

    public override async System.Threading.Tasks.Task OnActionExecutingAsync(System.Web.Http.Controllers.HttpActionContext actionContext, System.Threading.CancellationToken cancellationToken)
    {
        await WriteLogAsync(actionContext);  
    }

    private async System.Threading.Tasks.Task WriteLogAsync(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        using (System.IO.StreamWriter file = new System.IO.StreamWriter(logPath, true))
        {
            await file.WriteLineAsync("==========================");
            await file.WriteLineAsync(DateTime.Now.ToString());
            await file.WriteLineAsync("URL: " + actionContext.Request.RequestUri);
            await file.WriteLineAsync("Headers: " + actionContext.Request.Headers);
            await file.WriteLineAsync("Content-type: " + actionContext.Request.Content.Headers.ContentType);
            await file.WriteLineAsync("Content: " + (await actionContext.Request.Content.ReadAsStringAsync())); **// Content is always empty**
            await file.WriteLineAsync("==========================");
        }
    }
}

问题在标记行中。内容始终是空字符串，尽管我发送的数组如下：

[118119120122123,24,19,20,21,22,23124]

---

我在这里缺少什么？

您的

请求

流已被WebApi格式化程序使用。看：谢谢。您的链接很有用。您可能希望使用单个写入操作。太多的等待将影响性能。@PauloMorgado它取决于

AutoFlush

的值，对吗？否。对于每个

wait

关键字，将创建一个

任务。而且编译器生成的状态机也会更大。使用反射工具（.netreflector、ILSpy、JustDecompile）查看生成的代码。