如何从 HttpRequestMessage 中获取方法名称？答案

【问题标题】：How to get method name from HttpRequestMessage?如何从 HttpRequestMessage 中获取方法名称？
【发布时间】：2021-11-26 08:21:04
【问题描述】：

我有如下处理程序，我想从Controller 获取方法名称。使用var methodName = request.Method; 只返回“GET”或“POST”之类的方法类型。如何获取方法名称，例如。从 'http://localhost:4200/weatherforecast/getitem/2 我想返回“getitem”。

public class RequestAndResponseHandler : DelegatingHandler
{
    protected override async Task<HttpResponseMessage> SendAsync(
    HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request.Content != null)
        {
            string requestBody = await request.Content.ReadAsStringAsync();
            Trace.WriteLine(requestBody);
        }
        var response = await base.SendAsync(request, cancellationToken);

        if (response.Content != null)
        {
            var responseBody = await response.Content.ReadAsStringAsync();
            Trace.WriteLine(responseBody);
        }

        var methodName = request.Method;

        return response;
    }
}

【问题讨论】：

这能回答你的问题吗？ How can I get the route name in controller in ASP.NET MVC?

标签： c# .net rest asp.net-web-api2 webapi

【解决方案1】：

HttpRequestMessage.RequestUri 返回 System.Uri 对象。你可以使用

var Segments = filterContext.Request.RequestUri.Segments;

获取您请求的不同部分。要消除查询部分，您可以使用 HttpRequestMessage.RequestUri.Query

您需要查看与您相关的细分。在您的具体情况下，它将发送您想要的最后一段。

【讨论】：

【解决方案2】：

使用request.RequestUri.ToString()可以获取方法名。

以下代码将帮助您详细的请求和响应拦截。

public class CustomLogHandler : DelegatingHandler
{

protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
    var logMetadata = await BuildRequestMetadata(request);
    var response = await base.SendAsync(request, cancellationToken);
    logMetadata = await BuildResponseMetadata(logMetadata, response);
    await SendToLog(logMetadata);
    return response;
}
private async Task<LogMetadata> BuildRequestMetadata(HttpRequestMessage request)
{
    LogMetadata log = new LogMetadata
    {
        RequestMethod = request.Method.Method,
        RequestTimestamp = DateTime.Now,
        RequestUri = request.RequestUri.ToString(),
        RequestContent = await request.Content.ReadAsStringAsync(),
    };
    return log;
}
private async Task<LogMetadata> BuildResponseMetadata(LogMetadata logMetadata, HttpResponseMessage response)
{
    logMetadata.ResponseStatusCode = response.StatusCode;
    logMetadata.ResponseTimestamp = DateTime.Now;
    logMetadata.ResponseContentType = response.Content == null ? string.Empty : response.Content.Headers.ContentType.MediaType;
    logMetadata.Response = await response.Content.ReadAsStringAsync();
    return logMetadata;
}
private async Task<bool> SendToLog(LogMetadata logMetadata)
{
    try
    {
     //write this code
    }
    catch
    {
        return false;
    }
    return true;
}
}

【讨论】：