WPF C# 字符串读写文件

public class 字符串读写文件
{
        /// <summary>
        /// Encoding.Unicode.GetString 如果使用Encoding.Default.GetString 会错
        /// </summary>
        public 字符串读写文件()
        {
          f_文件地址="文件";
        }
        public bool x_写文件(string str)
        {            
            FileStream xiaFile = new FileStream(f_文件地址 , FileMode.Create);
            byte[] buf = Encoding.Unicode.GetBytes(str);
            xiaFile.Write(buf , 0 , buf.Length);
            xiaFile.Flush();
            xiaFile.Close();
            return true;
        }

        /// <summary>
        /// 读文件
        /// </summary>
        /// <param name="str">读文件内容保存到str</param>
        /// <returns>读文件成功返回true</returns>
        public bool d_读文件(out string str)
        {
            FileInfo fi = new FileInfo(f_文件地址);
            long len = fi.Length;

            FileStream fs = new FileStream(f_文件地址 , FileMode.Open);
            byte[] buffer = new byte[len];            
            fs.Read(buffer , 0 , (int)len);
            fs.Close();
            str = Encoding.Unicode.GetString(buffer);
            return true;
        }
        private string f_文件地址;      
}        

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