C#文件读写追加创建目录，判断目录是否存在等操作

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using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace FundData{    static class FileUtil    {        public static void Save(string filename, string data)        {            FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.Write);            StreamWriter sw = new StreamWriter(fs);            sw.Write(data);            sw.Close();            fs.Close();        }        public static void Append(string filename, string data)        {            FileStream fs = new FileStream(filename, FileMode.Append, FileAccess.Write);            StreamWriter sw = new StreamWriter(fs);            sw.Write(data);            sw.Close();            fs.Close();        }        public static string Load(string filename)        {            FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);            var s = new StreamReader(fs);            var data = s.ReadToEnd();            s.Close();            fs.Close();            return data;        }        public static bool IsDirectoryExist(string path)        {            return Directory.Exists(path);        }        public static void CreateDirectory(string path)        {            Directory.CreateDirectory(path);        }    }}

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