检查文件的存在和修改日期

Question

我正在创建一个使用从Random.org提取的数据的脚本。我无法弄清楚如何在不重复脚本的文件创建部分的情况下使其工作。我想要做的是创建一个新文件，如果文件不存在或如果文件> 24小时。

using UnityEngine; 
using System.IO; 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using TrueRNG; 

public class Player : MonoBehaviour { 
    private Transform TS; 
    public int pspeed = 20; 
    public static int playerLives = 3; 
    public static int score = 0; 
    float timer = 0f; 
    string trgd = "R:\\trrnd.txt"; 

    System.Text.StringBuilder sb = new System.Text.StringBuilder(); 

    public GameObject LaserFab; //variable to reference prefab. 

    // Use this for initialization 
    void Start() { 

     TS = transform; 

     TS.position = new Vector3(0, -14.78957f, 0); //Spawn point 

     if (File.Exists(trgd)) 
     { 
      print("The file exists! Checking time since creation..."); 
      //Get date from existing file. 
      string[] lines = File.ReadAllLines(trgd); 
      print(lines[0]); 
      DateTime genDate = Convert.ToDateTime(lines[0]); 
       //Is existing data more than 1 day old? 
       if (genDate.AddDays(1) > DateTime.UtcNow) 
       { 
        print("Random data is old, creating new file..."); 
       } 
     //Append the current date and time to the beginning of a new file 
File.AppendAllText(trgd, DateTime.UtcNow.ToString("G") + Environment.NewLine); 
     while (!TrueRandom.RandInternet.IsAvailableUniform()) 
     { 
     print("Waiting for True RNG/Random.org data..."); 
     } //End while loop 
      for (int i = 0; i < 10; i++) 
      { 
       double rn = TrueRandom.RandInternet.Uniform(); 
       //Append all the Random.org-pulled data to a single String 
       sb.AppendLine(rn.ToString()); 
      } //End for writing loop 
     //Write the "truly" random String to a file 
     File.WriteAllText(trgd, sb.ToString()); 
     } //End date check if 
    } //End Start 

    // Update is called once per frame 
    void Update() { 
     TS.Translate(Vector3.right * Input.GetAxis("Horizontal") * pspeed * Time.deltaTime); 

     if (TS.position.x>11.25f || TS.position.x<-11.25f) { 
      TS.position = new Vector3 (TS.position.x*-1, TS.position.y, TS.position.z); 
     } 

     //Fire a laser with the Spacebar. 
     if (Input.GetKeyDown("space")) { 


      //Get pseudo-randomized laser position 
      //This works but is not "truly" random. The random data should be pulled from the trgd file 
      //float laspo = TrueRandom.RandInternet.Uniform() > 0.5f ? -1.917277f : 1.917277f; 

      //Set Laser position 
      Vector3 position = new Vector3(TS.position.x/*+laspo*/, TS.position.y+3.50f, TS.position.z); 

      //Fire projectile. 
      Instantiate(Resources.Load("LaserFab"), position, Quaternion.identity); 

     } 

     if (Time.time - timer > 0.4f) { 
      renderer.enabled = true; 
     } 

     print ("Lives remaining: " + playerLives + " Score: " + score + " Current playing time: " + "0"); 
    } 

    void OnTriggerEnter(Collider collider) 
    { 
     if (collider.CompareTag ("Enemy")) { //Tag is name of prefab. 
      //When the enemy hits the player, destroy the player and the enemy. 
      playerLives--; 
      renderer.enabled = false; 
      timer = Time.time; 
     } 

     if (playerLives < 1) 
      Destroy(this.gameObject); 
    } 
} 

Answer 1

你可以尝试这样的事情：

if (!File.Exists(@"C:\file.txt") || 
     (File.GetCreationTime(@"C:\file.txt") < DateTime.Now.AddDays(-1))) 
{ 
    //Recreate file 
} 

Answer 2

string trgd = "D:\\trrnd.txt"; 
if(File.Exists(trgd)) 
{ 
    var dt = File.GetCreationTimeUtc(trgd); 
    if((dt - DateTime.UtcNow).Hour > 24) 
    { 
     //Overwrite existing file 
     File.WriteAllLines(trgd,"Some new text"); 
    } 
} 
else 
{ 
    //append to existing file 
    File.AppendAllText(trgd,"Some Text"); 
} 

Answer 3

您可以创建一个FileInfo对象，并从获取所有信息，以及：

var f = new FileInfo(@"R:\trrnd.txt"); 

if(!f.Exists || f.CreationTime < DateTime.Now.AddDays(-1)) 
{ 
    //do stuff 
} 

你也可以使用UTC次：

if(!f.Exists || f.CreationTimeUtc < DateTime.UtcNow.AddDays(-1)) 
{ 
    //do stuff 
}