using System; namespace DemoConsole { class Program { static void Main(string[] args) { // base64字符串 string base64Str = ""; byte[] bytes = Convert.FromBase64String(base64Str); // 写入文件到指定位置 using (System.IO.FileStream fs = new System.IO.FileStream("D:\\001.jpg", System.IO.FileMode.Create, System.IO.FileAccess.Write)) { fs.Write(bytes, 0, bytes.Length); fs.Flush(); } } } }