C# 简单读取文件

        private byte[] ReadFile(FileInfo file)
        {
            var memoryStream = new MemoryStream();
            using (var stream = file.OpenRead())
            {
                stream.CopyTo(memoryStream);
            }

            return memoryStream.GetBuffer();
        }

            string str;
            using (var stream = new StreamReader(file.OpenRead()))
            {
                str = stream.ReadToEnd();
            }

string str = System.IO.File.ReadAllText(path);