如何使用 HttpModule 记录请求输入流，然后重置 InputStream 位置

发布于 2024-08-10 17:52:27 字数 732 浏览 3 评论 0原文

我正在尝试使用 IHttpModule 来记录 http 请求的内容，如下所示：

public class LoggingModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.BeginRequest += ContextBeginRequest;
    }

    private void ContextBeginRequest(object sender, EventArgs e)
    {
        var request = ((HttpApplication)sender).Request;
        string content;

        using (var reader = new StreamReader(request.InputStream))
        {
            content = reader.ReadToEnd();
        }

        LogRequest(content)
    }
}

问题是，在读取输入流末尾后，InputStream 似乎消失了，或更可能的是，光标位于溪流。

我尝试过 request.InputStream.Position = 0; 和 request.InputStream.Seek(0, SeekOrigin.Begin); 但都不起作用。

原文

I am trying to log the contents of an http request, using an IHttpModule like so:

public class LoggingModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.BeginRequest += ContextBeginRequest;
    }

    private void ContextBeginRequest(object sender, EventArgs e)
    {
        var request = ((HttpApplication)sender).Request;
        string content;

        using (var reader = new StreamReader(request.InputStream))
        {
            content = reader.ReadToEnd();
        }

        LogRequest(content)
    }
}

The problem is that after reading the input stream to the end, the InputStream seems to have either disappeared or more likely, the cursor is at the end of the stream.

I have tried request.InputStream.Position = 0; and request.InputStream.Seek(0, SeekOrigin.Begin); but neither work.

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淡笑忘祈一世凡恋 2024-08-17 17:52:27

我已经解决了这个问题：我认为在 StreamReader 上调用 dispose 也一定会杀死 InputStream。

我没有使用 StreamReader，而是执行了以下操作：

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

所以完整的代码：

public class LoggingModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.BeginRequest += ContextBeginRequest;
    }

    private void ContextBeginRequest(object sender, EventArgs e)
    {
        var request = ((HttpApplication)sender).Request;

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

        LogRequest(content)
    }
}

I've worked out the problem: I think that calling dispose on the StreamReader must be killing the InputStream too.

Instead of using the StreamReader I did the following:

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

So the complete code:

public class LoggingModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.BeginRequest += ContextBeginRequest;
    }

    private void ContextBeginRequest(object sender, EventArgs e)
    {
        var request = ((HttpApplication)sender).Request;

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

        LogRequest(content)
    }
}

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或十年 2024-08-17 17:52:27

是的，StreamReader 将关闭提供的流。

如果您使用的是 >v4.5，请使用 StreamReader 构造函数使流保持打开状态。

using (var reader = new StreamReader(request.InputStream, Encoding.UTF8, true, 1024, true))
{
    content = reader.ReadToEnd();
}

Yes the StreamReader will close the supplied stream.

If you're on >v4.5, use a StreamReader constructor that leaves the stream open.

using (var reader = new StreamReader(request.InputStream, Encoding.UTF8, true, 1024, true))
{
    content = reader.ReadToEnd();
}

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月竹挽风 2024-08-17 17:52:27

我不得不对“cbp”提供的答案进行一些小小的调整。当使用他的代码时我只得到零。我将位置设置为 0 以上，现在它可以工作了。

 var bytes = new byte[Request.InputStream.Length];
 Request.InputStream.Position = 0;
 Request.InputStream.Read(bytes, 0, bytes.Length);
 string content = Encoding.ASCII.GetString(bytes);

I had to make a small tweak to the answer provided by "cbp". When using his code I just got zeros. I moved setting the position to 0 above the read and now it works.

 var bytes = new byte[Request.InputStream.Length];
 Request.InputStream.Position = 0;
 Request.InputStream.Read(bytes, 0, bytes.Length);
 string content = Encoding.ASCII.GetString(bytes);

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帅气称霸 2024-08-17 17:52:27

这个答案不起作用。它返回一个包含空值的数组。

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

because the input stream consumed.

this answer did not work. it returns an array that contains null values.

        var bytes = new byte[request.InputStream.Length];
        request.InputStream.Read(bytes, 0, bytes.Length);
        request.InputStream.Position = 0;
        string content = Encoding.ASCII.GetString(bytes);

because the input stream consumed.

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