在 Web Api 核心操作过滤器中获取请求正文作为字符串？ [复制]

Question

以下是我在 WebApi .Net Core 2 项目中的 ActionFilter：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class RequestLoggingAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext actionContext)
    {
        var request = actionContext.HttpContext.Request;
        var route = request.Path.HasValue ? request.Path.Value : "";
        var requestHeader = request.Headers.Aggregate("", (current, header) => current + $"{header.Key}: {header.Value}{Environment.NewLine}");
        request.EnableRewind();
        var requestBody = new StreamReader(request.Body).ReadToEnd();
    }
}

requestHeader 具有正确的值并且没关系，但requestBody 始终为空。
我通过向操作发送具有以下正文的请求来测试它。

[
 {
  "TrackingCode": "96003445",
  "Description": "",
  "InnerMessage": "",
  "Status": 11
 },
 {
  "TrackingCode": "96003840",
  "Description": "",
  "InnerMessage": "Inner message",
  "Status": 11
 }
]

如何在 WebApi Core 2 ActionFilter 中获取请求正文？

Answer 1

使用@Nkosi 指南，我可以找到如下解决方案：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class RequestLoggingAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext actionContext)
    {
        var request = actionContext.HttpContext.Request;
        var route = request.Path.HasValue ? request.Path.Value : "";
        var requestHeader = request.Headers.Aggregate("", (current, header) => current + $"{header.Key}: {header.Value}{Environment.NewLine}");
        var requestBody = "";
        request.EnableRewind();
        using (var stream = new StreamReader(request.Body))
        {
            stream.BaseStream.Position = 0;
            requestBody = stream.ReadToEnd();
        }
    }
}

效果很好