HttpClient,PostAsync,文件上传,边界已添加到文件主体

时间:2019-11-12 17:43:57

标签: .net file httpclient

我是这个论坛的新手,所以我不允许直接添加图片。我也不允许添加标签“ PostAsync”或“ MultipartFormDataContent”。 希望网址的工作和帖子的意义!

我在.NET控制台应用程序中使用HttpClient将文件发布到外部Web服务。 目前,我正在使用如下所示的虚拟文档(.txt): Original document

POST可以工作并上载文档,但是它已将边界,内容处置和内容类型附加到文档文本中: Document after post

代码如下: code

如果我查看RequestMessage-> Content,则标题对我来说看起来不错:Content Header

我的问题是: 这与我的POST有关,还是与Web服务如何处理/接收请求有关?我已经尝试了4种不同的“变体”(几乎完全相同)来执行具有相同结果的POST。 我还尝试从边界中删除引号:

var boundaryValue = content.Headers.ContentType.Parameters.FirstOrDefault(p => p.Name == "boundary");

boundaryValue.Value = boundaryValue.Value.Replace("\"", String.Empty); 

感谢任何输入,这已经困扰了我一阵子:)

编辑

        string filePath = @"C:\Development\Customer\PKH\Documaster\TestFileToUpload.txt";
        // we need to send a request with multipart/form-data
        var content = new MultipartFormDataContent();
        var fileContent = new StreamContent(File.OpenRead(filePath));
        fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
        {
            Name = "\"files\"",
            FileName = "\"" + Path.GetFileName(filePath) + "\""
        };
        fileContent.Headers.ContentType = new MediaTypeHeaderValue("plain/text");
        content.Add(fileContent);

        //Create uri
        var builder = new UriBuilder(httpClient.BaseAddress + "integration/hub/v1/upload-single-file");
        var query = HttpUtility.ParseQueryString(builder.Query);
        var fileName = Path.GetFileName(filePath);
        query["file-name"] = fileName;
        builder.Query = query.ToString();
        string url = builder.ToString();

        //Do post
        try
        {
            HttpResponseMessage responseString = await httpClient.PostAsync(url, content);
            var contents = await responseString.Content.ReadAsStringAsync();
            JObject newDocument = JObject.Parse(contents);
            return newDocument;
        }
        catch(Exception)
        {
            return null;
        }

// Eivind

2 个答案:

答案 0 :(得分:0)

没关系,我最终想出了这个: 接收端希望获得一个八位字节流,而不是多格式/数据,因此我只需要将其作为ByteArray发送并指定MediaTypeHeaderValue即可:

string filePath = @"C:\Development\Customer\PKH\Documaster\TestDocxToUpload.docx";
        var filebytes = File.ReadAllBytes(filePath);

        //Create uri
        var builder = new UriBuilder(httpClient.BaseAddress + "integration/hub/v1/upload-single-file");
        var query = HttpUtility.ParseQueryString(builder.Query);
        var fileName = Path.GetFileName(filePath);
        query["file-name"] = fileName;
        builder.Query = query.ToString();
        string url = builder.ToString();

        //Do post
        try
        {
            using (var content = new ByteArrayContent(filebytes))
            {
                content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                HttpResponseMessage responseString = await httpClient.PostAsync(url, content);
                var contents = await responseString.Content.ReadAsStringAsync();
                JObject newDocument = JObject.Parse(contents);
                return newDocument;
            }


        }
        catch(Exception)
        {
            return null;
        }

// Eivind

答案 1 :(得分:0)

非常感谢您的帖子。我一直在寻找一种使用 Graph 上传文档的方法,但找不到显示如何设置 Word 文档内容格式的示例。你真的帮了我。

这就是我使用 Graph 将 Word 文档上传到 SharePoint 在线网站的方式。

byte[] fileContent = File.ReadAllBytes("Samples\\Document1.docx");
string targetPath = "/UploadedDocument.docx";
string uploadUrl = $"https://graph.microsoft.com/v1.0/sites/{siteId}/drive/root:{targetPath}:/content";
using (var content = new ByteArrayContent(fileContent))
{
    content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/octet-stream");
    HttpResponseMessage responseString = await httpClient.PutAsync(uploadUrl, content);
    string contents = await responseString.Content.ReadAsStringAsync();
}