How to send file with http - file

Question

I am trying from a .net client to download a file via a .net server (file is located on server machine ) using the StreamContent.However when launching the request i am getting the exception:
Exception
Stream does not support reading.
Client
class Program {
static async Task Main(string[] args) {
HttpClient client = new HttpClient();
using (FileStream stream = new FileStream("txt.path", FileMode.OpenOrCreate, FileAccess.Write)) {
var content = new StreamContent(stream);
var response = await client.PostAsync("http://localhost:5300/get", content);
}
}
}
Server
public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
if (env.IsDevelopment()) {
app.UseDeveloperExceptionPage();
}
string fname = "dld.txt";
app.Run(async (context) => {
if (!(context.Request.Path == "get")) {
return;
}
File.WriteAllText(fname, "data is:" + DateTime.Now.ToString());
FileStream fs = new FileStream(fname, FileMode.Open, FileAccess.Read);
using (Stream stream = context.Response.Body) {
await fs.CopyToAsync(stream);
}
});
}

Answer 1

Hi you can use like this:
HttpContent stringContent = new StringContent(paramString); //if you want to use string
HttpContent fileStreamContent = new StreamContent(paramFileStream); //if you want to use file stream
HttpContent bytesContent = new ByteArrayContent(paramFileBytes);// if you want to use aray of bytes
using (var client = new HttpClient())
{
using (var formData = new MultipartFormDataContent())
{
formData.Add(stringContent, "param", "param");
formData.Add(fileStreamContent, "file", "file");
formData.Add(bytesContent, "file", "file");
var response = await client.PostAsync("some URL", formData);
if (!response.IsSuccessStatusCode)
{
return null;
}
return await response.Content.ReadAsStreamAsync();
}
}

Answer 2

I was having trouble getting the file because i wanted to use the Request.Body stream as a sink.I wanted the server to write the data on this stream (i thought the Request stream can be used both ways).
I have solved it by using the Response stream instead:
Client
static async Task Main(string[] args) {
HttpClient client = new HttpClient();
using (FileStream stream = new FileStream("data.txt", FileMode.OpenOrCreate, FileAccess.Write)) {
var content = new StringContent("not important");
var response = await client.PostAsync("http://localhost:5300/get",content);
await response.Content.CopyToAsync(stream);
}
}