System.IO.InvalidDataException: Missing content-type boundary.

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• 开发语言：C#
• 框架集：.NET 8

使用HttpClient上传文件报错：System.IO.InvalidDataException: Missing content-type boundary.

解决代码：

  [TestMethod]public async Task Test3(){string fileName = "132.pdf";HttpClient httpClient = new HttpClient();         ByteArrayContent byteArrayContent = new ByteArrayContent(File.ReadAllBytes("D:\\桌面\\测试文件1.pdf"));       MultipartFormDataContent formData = new MultipartFormDataContent();     formData.Add(byteArrayContent, "file", fileName);//文章详情pdf,上传文件到即时通里面，作为临时素材；var response = await httpClient.PostAsync("http://xx.gg.com/upload", formData);string json = await response.Content.ReadAsStringAsync();}

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