c# - 如何使用 HttpClient 发布表单数据 IFormFile？

Question

我有后端端点 Task<ActionResult> Post(IFormFile csvFile)我需要从 HttpClient 调用这个端点。目前我得到 Unsupported media type error .这是我的代码:

var filePath = Path.Combine("IntegrationTests", "file.csv");
var gg = File.ReadAllBytes(filePath);
var byteArrayContent = new ByteArrayContent(gg);
var postResponse = await _client.PostAsync("offers", new MultipartFormDataContent
{
    {byteArrayContent }
});

Answer 1

需要在MultipartFormDataContent集合中指定参数名匹配 Action 参数名(csvFile)和一个随机文件名

var multipartContent = new MultipartFormDataContent();
multipartContent.Add(byteArrayContent, "csvFile", "filename");
var postResponse = await _client.PostAsync("offers", multipartContent);

或等效

var postResponse = await _client.PostAsync("offers", new MultipartFormDataContent {
    { byteArrayContent, "csvFile", "filename" }
});