Install

dotnet add package WinSCP

Example

// 連線設定
SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = "hostname",
    PortNumber = port,
    UserName = "xxxx",
    SshHostKeyFingerprint = "ssh-rsa 2048 xxxxxxxxxxxxxxxxxxxxxxxxxxx",
    SshPrivateKeyPath = "...." // 私鑰路徑自行調整(選用)
};

// 開啟會話
using var session = new Session();
session.Open(sessionOptions);

// 定義上傳的文件路徑和遠端目錄
string localFilePath = "文件路徑";
string remoteDirectory = "伺服器目錄"; // 遠端伺服器的目錄

// 上傳文件
TransferOperationResult transferResult;
transferResult = this.session.PutFiles(localFilePath, remoteDirectory);

// 檢查上傳是否成功
transferResult.Check();

參考資料

https://winscp.net/eng/docs/library#csharp