在 RestSharp 中限制下载大小

Question

我们正在使用 RestSharp v105.2.3。

有没有办法在收到 N 个字节后停止接收响应，其中 N 是我可以控制的参数？

编辑：这是我根据下面 Berin 的回答得出的完整解决方案。

public static class IRestClientExtensions
{
    public static IRestResponse Execute(this IRestClient client, IRestRequest request, byte[] buffer, out int bufferSize)
    {
        var totalBytesRead = 0;

        request.ResponseWriter = stream =>
        {
            while (totalBytesRead < buffer.Length)
            {
                var bytesRead = stream.Read(buffer, totalBytesRead, buffer.Length - totalBytesRead);
                if (bytesRead == 0)
                {
                    break;
                }

                totalBytesRead += bytesRead;
            }
        };

        var response = client.Execute(request);

        bufferSize = totalBytesRead;
        return response;
    }
}

单元测试（使用 NUnit）：

[TestFixture]
public class IRestClientExtensionsTests
{
    [Test, Explicit]
    public void Execute_OutputBufferTooSmall()
    {
        var client = new RestClient("https://www.w3.org/TR/html4/charset.html");
        var request = new RestRequest();

        var buffer = new byte[4 * 1024];
        int bufferSize;
        var response = client.Execute(request, buffer, out bufferSize);

        Assert.AreEqual(HttpStatusCode.OK, response.StatusCode);
        Assert.IsTrue(string.IsNullOrEmpty(response.Content));
        Assert.AreEqual(buffer.Length, bufferSize);
    }

    [Test, Explicit]
    public void Execute_OutputBufferLargeEnough()
    {
        var client = new RestClient("https://www.w3.org/TR/html4/charset.html");
        var request = new RestRequest();

        var buffer = new byte[256 * 1024];
        int bufferSize;
        var response = client.Execute(request, buffer, out bufferSize);

        Assert.AreEqual(HttpStatusCode.OK, response.StatusCode);
        Assert.IsTrue(string.IsNullOrEmpty(response.Content));
        Assert.IsTrue(bufferSize < buffer.Length);
    }
}

Answer 1

我相信有办法，但是您失去了 RestResponse 提取数据并自动反序列化的能力。我相信用例更多的是从云中提取 Blob：

var client = new RestClient("http://example.com");
var request = new RestRequest("resource/{id}", Method.POST);

request.ResponseWriter = (stream) => {
    // work with the writer you recieve here.
    // This is an Action<Stream> callback
};

// NOTE: the callback is invoked during this statement:
IRestResponse response = client.Execute(request);

// The response has all the meta information, but none of the data.

ResponseWriter 属性是一个 Action<Stream> 回调。读取 HTTP 响应的代码要么调用 ResponseWriter（如果提供），要么一次读取所有字节并填充 Response.RawBytes 属性.

您必须选择您想要的行为。

在 RestSharp 中限制下载大小

Limit download size in RestSharp

c#

restsharp