Filename encoding issue in latest version.

[kashifjaved1]

I'm using the latest stable version of restsharp (v110.2.0) to upload zip file to external link with name "Präsentation_Export" but after successful upload got "Pr�sentation_Export" from restsharp. I had done this work successfully working in version 105.2.3 but in v110.2.0 its not working.
Below is my controller method:

public async Task<ApiResponse> UploadRequest(int? Id, IFormFile file, string APIEndPoint, string MethodType)
{
 ApiResponse result = new ApiResponse();
 try
 {
 var queryString = new Dictionary<string, string>() { { "access_token", AccessToken } };
 Uri uri = new Uri(string.Format(BaseURL + APIEndPoint, string.Empty));
 var requestUri = QueryHelpers.AddQueryString(uri.ToString(), queryString);

 using var memoryStream = new MemoryStream();
 var client = new RestClient(uri);
 await file.CopyToAsync(memoryStream);
 //var restRequest = new RestRequest(requestUri, Method.Post);
 restRequest.AddHeader("Content-Type", "multipart/form-data");
 var restRequest = new RestRequest("https://tpsupport.tpondemand.com/", Method.Post)
 .AddFile("attachment", memoryStream.ToArray(), file.FileName, file.ContentType, options: new FileParameterOptions { DisableFilenameEncoding = true });

 if (Id != null)
 {
 restRequest.AddParameter("generalId", Id.Value);
 }

 var response = await client.ExecuteAsync(restRequest);

 string resultContent = response.Content;
 if (response.IsSuccessStatusCode)
 {
 result.Data = resultContent;
 }
 else
 {
 result.ExceptionObject = JsonConvert.DeserializeObject<Exception>(resultContent);
 }
 result.StatusCode = (int)response.StatusCode;
 return result;
 }
 catch (Exception ex)
 {
 result.ExceptionObject = ex;
 result.StatusCode = 500;
 return result;
 }
}

Desktop:

OS: Windows 11
.NET version 4.7.2
Version 110.2.0

Additional Information:
I'm uploading file with name "Präsentation_Export.zip", but after successful upload getting it with name "Pr�sentation_Export.zip".

[alexeyzimarev]

I believe the issue is here:

if (!fileParameter.Options.DisableFileNameStar) dispositionHeader.FileNameStar = fileParameter.FileName;

RestSharp should set FileNameStar to the encoded filename, not the raw string.

[alexeyzimarev]

Ok, I added a test and found out that it's not a bug and my PR doesn't really fix anything, it breaks things.

What you need to do is to enable fileName* by setting DisableFileNameStar to false (it's true by default).