c# - 如何在 asp net core 2.2 中间件中多次读取请求正文？

Question

我试过这个:
Read request body twice
还有这个:
https://github.com/aspnet/Mvc/issues/4962
但没有用。
我像这样阅读请求正文:

app.Use(async (context, next) =>
{
    var requestBody = await ReadStream(context.Request.Body);
    var requestPath = context.Request.Path.ToString();
    //Do some thing

    await next.Invoke();

    var responseStatusCode = context.Response.StatusCode;
    //Do some other thing
});

private async Task<string> ReadStream(Stream stream)
{
    using (var streamReader = new StreamReader(stream))
    {
        var result = await streamReader.ReadToEndAsync();

        return result;
    }
}

在 Controller 中，我得到“已处置的对象”或“空流”。

Answer 1

.netcore 3.1 版本的@HoussamNasser 上面的答案。我创建了一个可重用的函数来读取请求正文。请注意更改:HttpRequestRewindExtensions.EnableBuffering(request) . EnableBuffering 现在是 HttpRequestRewindExtensions 的一部分类(class)。

public async Task<JObject> GetRequestBodyAsync(HttpRequest request)
    {
        JObject objRequestBody = new JObject();

        // IMPORTANT: Ensure the requestBody can be read multiple times.
        HttpRequestRewindExtensions.EnableBuffering(request);

        // IMPORTANT: Leave the body open so the next middleware can read it.
        using (StreamReader reader = new StreamReader(
            request.Body,
            Encoding.UTF8,
            detectEncodingFromByteOrderMarks: false,
            leaveOpen: true))
        {
            string strRequestBody = await reader.ReadToEndAsync();
            objRequestBody = SerializerExtensions.Deserialize<JObject>(strRequestBody);

            // IMPORTANT: Reset the request body stream position so the next middleware can read it
            request.Body.Position = 0;
        }

        return objRequestBody;
    }

此函数将返回一个 JObject，可用于读取 Request Body 对象的属性。 SerializerExtensions 是我用于序列化和反序列化的自定义扩展。

在中间件中可以注入(inject) IHttpContextAccessor httpContextAccessor在构造函数中。然后访问 Request 对象，如 HttpRequest request = _httpContextAccessor.HttpContext.Request; .最后，可以调用像 GetRequestBodyAsync(request)这样的可重用函数