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将图片上载到oData web服务

put image-uploading httpclient uwp c#

Mohsen · 技术社区 · 6 年前

在我的ODataWebService中,有一个名为 Ware . 这 器皿 具有类型的属性 Image 打电话 Picture . 当我想在UWP应用程序中使用 HttpClient 我只是打电话 http://localhost:8797/Data/Ware(2)/Picture . 代码如下:

    using (var client = new HttpClient(handler))
    {
        client.BaseAddress = new Uri(DataServiceAddress + "Data/");
        client.DefaultRequestHeaders.Clear();
        client.DefaultRequestHeaders.Accept.Clear();
        using (HttpResponseMessage message = await client.GetAsync(url))
        {
            message.EnsureSuccessStatusCode();
            var content = (StreamContent)message.Content;
            return await content.ReadAsByteArrayAsync();
        }
    }

这工作正常,并将图片作为数组的字节返回给我。现在我想上传新的 相片 通过执行“PUT”。我试过下面的代码:

    public static async Task PutImage(string url, byte[] image)
    {
         var handler = new HttpClientHandler { UseDefaultCredentials = true };
         using (var client = new HttpClient(handler))
         {
            client.BaseAddress = new Uri(DataServiceAddress + "Data/");
            client.DefaultRequestHeaders.Clear();
            client.DefaultRequestHeaders.Accept.Clear();
            using (var ms = new MemoryStream(image))
            {
                using (var message = await client.PutAsync(url, httpContent))
                {
                    message.EnsureSuccessStatusCode();
                }
            }
        }
    }

那么当我打电话的时候 PutImage("Ware(2)/Picture", myFile.toByteArray()) ,我正在 Bad Request 回答有趣的是当我尝试 PUT 具有 邮递员 它工作得很好。正如你在下面的图片中看到的 204 结果和我的图片已成功更改。

Screenshot: Postman is successful sending the file with a 'PUT' verb to the odata server

谁能帮我一下吗?

这是Postman生成的代码:

    PUT /Data/Ware(2)/Picture HTTP/1.1
    Host: localhost:8797
    Authorization: Basic QWRtaW46
    Cache-Control: no-cache
    Postman-Token: 37827f09-8841-7ccb-c462-d488ef4c4e9d

    undefined

我做了很多谷歌搜索。但没有希望(

1 回复 | 直到 6 年前

Mohsen 6 年前

终于完成了:)

   public static async Task PutImage(string url, byte[] image)
   {
        var httpContent = new ByteArrayContent(image);

        var handler = new HttpClientHandler { UseDefaultCredentials = true };
        using (var client = new HttpClient(handler))
        {
            client.BaseAddress = new Uri(DataServiceAddress + "Data/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("*/*"));
            client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("gzip"));
            client.DefaultRequestHeaders.AcceptEncoding.Add(new StringWithQualityHeaderValue("deflate"));

            using (var request = new HttpRequestMessage(HttpMethod.Put, url) { Content = httpContent })
            {

                httpContent.Headers.ContentType = new MediaTypeHeaderValue("text/plain");
                using (var message = await client.SendAsync(request))
                {
                    message.EnsureSuccessStatusCode();
                }
            }
        }
    }

它工作得很好。