將 HttpResponseMessage 轉換為字節數組

Question

我在將圖像上傳到服務器時遇到了一些麻煩

這是代碼：

var uploadServer = api.Photo.GetUploadServer(123);

var c = new HttpClient();

var formData = new MultipartFormDataContent();
var requestContent = new MultipartFormDataContent();
var fileContent = new ByteArrayContent(File.ReadAllBytes("images/amogus.jpg"));
fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = "amogus.jpg"
};
formData.Add(fileContent);


var responseFile = Encoding.ASCII.GetString(await c.PostAsync(uploadServer.UploadUrl, formData));

首先我得到了一個在那里上傳圖片的鏈接，然后我將圖片添加到formData並嘗試使用PostAync發送，在這一步我遇到了麻煩，因為PostAsync希望uploadUrl是byte []，但它是一個HttpResponseMessage。 我如何轉換它？

這里還有錯誤信息：

參數 1：無法從 'System.Net.Http.HttpResponseMessage' 轉換為 'byte[]'

Answer 1

您可以使用ReadAsStreamAsync然后將其傳遞給StreamReader以讀取字符串。

您還缺少各種using塊，您也可以 stream 將您的文件直接放入ByteArrayContent 。 requestContent似乎在這里沒有使用。

static HttpClient c = new HttpClient();  // always keeps static or you could get socket exhaustion

using (var formData = new MultipartFormDataContent())
using (var fileContent = new StreamContent(File.Open("images/amogus.jpg", FileMode.Open, FileAccess.Read)))
{
    fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = "amogus.jpg"
    };
    formData.Add(fileContent);

    using (var response = await c.PostAsync(uploadServer.UploadUrl, formData))
    using (var responseStream = await response.Content.ReadAsStreamAsync())
    using (var reader = new StreamReader(responseStream, Encoding.ASCII))
    {
        var yourString = await responseStream.ReadToEndAsync();
        // do stuff with string
    }
}

你確定你想要ASCII而不是UTF8嗎？ 如果是這樣，您可以將整個事情縮短到這個

using (var formData = new MultipartFormDataContent())
using (var fileContent = new StreamContent(File.Open("images/amogus.jpg", FileMode.Open, FileAccess.Read)))
{
    fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = "amogus.jpg"
    };
    formData.Add(fileContent);

    using (var response = await c.PostAsync(uploadServer.UploadUrl, formData))
    {
        var yourString = await response.ReadAsStringAsync();
        // do stuff with string
    }
}