c# - RestSharp AddFile adding multipart form headers to file -

i'm using restsharp's addfile , it's working close fine except files end getting broken due header information that's being added.

-------------------------------28947758029299 content-disposition: form-data; name="user.png"; filename="user.png" content-type: image/png 

this test image uploaded. if remove these lines file opens fine, otherwise seems corrupt. possible me use addfile without stuff getting added?

current code:

string contenttype = mimemapping.getmimemapping("~/uploads/" + filename); //image/png etc request.addfile(filename, server.mappath("~") + "\\uploads\\" + filename, contenttype); irestresponse response = client.execute(request); 

also tried same result:

request.addheader("content-type", contenttype); byte[] bytes = file.readallbytes(server.mappath("~") + "\\uploads\\" + filename); request.addbody(new {myfile = file.readallbytes(server.mappath("~") + "\\uploads\\" + filename) }); 

also (no files went through @ here): edit: worked actually

string contenttype = mimemapping.getmimemapping("~/uploads/" + filename); byte[] bytes = file.readallbytes(server.mappath("~") + "\\uploads\\" + filename);  request.addheader("content-type", contenttype); request.addparameter(contenttype, bytes, parametertype.requestbody);  irestresponse response = client.execute(request); 

restsharp default sending files using multi-part form data , zendesk api using (assuming it's 1 https://developer.zendesk.com/rest_api/docs/core/attachments#upload-files) isn't expecting that, writing multi-part boundary identifiers content uploaded file.

this answer https://stackoverflow.com/a/27994251/772973 on other thread should resolve problem.

update

i put console app following code in upload pdf asp.net webapi project created don't have access zendesk api

main in program.cs:

static void main(string[] args) {     restrequest request = new restrequest("values?filename=test.pdf", method.post);      request.addparameter("application /pdf", file.readallbytes(@"c:\temp\upload.pdf"), parametertype.requestbody);      var client = new restclient(new uri("http://localhost:55108/api"));      var response = client.execute(request);      console.readline(); } 

code in valuescontroller.cs

public async task post(string filename) {    static void main(string[] args) {     restrequest request = new restrequest("values?filename=test.pdf", method.post);      request.addparameter("application/pdf", file.readallbytes(@"c:\temp\upload.pdf"), parametertype.requestbody);      var client = new restclient(new uri("http://localhost:55108/api"));      var response = client.execute(request);      console.readline(); }     var file = await this.request.content.readasbytearrayasync();     file.writeallbytes($"c:\\uploaded\\{filename}",file); } 

this uploaded file, identical original file , content-type header set application/pdf , not multipart/form-data; boundary=-----------------------------28947758029299

update 2

added actual code main in program.cs