如何克隆HttpRequestMessage当原来的请求有内容？ [英] How to clone a HttpRequestMessage when the original request has Content?

问题描述

我想克隆使用这个答案概括的方法的请求：
http://stackoverflow.com / A /四十零万六千三百二十二分之一千八百〇一万四千五百一十五

I'm trying to clone a request using the method outlined in this answer: http://stackoverflow.com/a/18014515/406322

不过，我得到一个的ObjectDisposedException，如果原始请求已经收到的内容。

However, I get an ObjectDisposedException, if the original request has content.

你怎么能可靠地克隆HttpRequestMessage

How can you reliably clone a HttpRequestMessage?

推荐答案

这应该做的伎俩：

    public static async Task<HttpRequestMessage> CloneHttpRequestMessageAsync(HttpRequestMessage req)
    {
        HttpRequestMessage clone = new HttpRequestMessage(req.Method, req.RequestUri);

        // Copy the request's content (via a MemoryStream) into the cloned object
        var ms = new MemoryStream();
        if (req.Content != null)
        {
            await req.Content.CopyToAsync(ms).ConfigureAwait(false);
            ms.Position = 0;
            clone.Content = new StreamContent(ms);

            // Copy the content headers
            if (req.Content.Headers != null)
                foreach (var h in req.Content.Headers)
                    clone.Content.Headers.Add(h.Key, h.Value);
        }


        clone.Version = req.Version;

        foreach (KeyValuePair<string, object> prop in req.Properties)
            clone.Properties.Add(prop);

        foreach (KeyValuePair<string, IEnumerable<string>> header in req.Headers)
            clone.Headers.TryAddWithoutValidation(header.Key, header.Value);

        return clone;
    }

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