通過TextAsset類讀取文檔

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Demo : MonoBehaviour
{
    public TextAsset texttest;
    void Start()
    {
        Debug.Log(texttest.text);
    }
}

通過File類讀取文件

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

public class Demo : MonoBehaviour
{
    void Start()
    {
        string textTxtpath = File.ReadAllText(Application.streamingAssetsPath + "/test.txt");
        Debug.Log(textTxtpath);
    }
}

也可以使用File類的ReadAllLines()函數，將這個文檔按照一行一行進行全部讀取：

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

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string[] textTxt = File.ReadAllLines(Application.streamingAssetsPath + "/TextRead.txt");
        for (int i = 0; i < textTxt.Length; i++)
        {
            Debug.Log(textTxt[i]);
        }
    }
}

上面兩個函數都各自有一個重載函數：

public static string[] ReadAllLines(string path);
public static string[] ReadAllLines(string path, Encoding encoding);
public static string ReadAllText(string path, Encoding encoding);
public static string ReadAllText(string path);

可以以設定的文檔格式打開文檔。

以文件流的形式讀取文檔

通過IO命名空間下的FileStream類進行讀取文檔數據：

這是第一種方式，通過FileStream類的實例化方法去加載文件：

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        //文件流形式讀取文檔
        using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
        {
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            string str= Encoding.UTF8.GetString(bytes);
            Debug.Log(str);
        }
    }
}

還可以通過File類的OpenRead()函數加載文檔：

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        //文件流形式讀取文檔
        using (FileStream fs = File.OpenRead(Application.streamingAssetsPath + "/TextRead.txt"))
        {
            byte[] bytes = new byte[fs.Length];
            fs.Read(bytes, 0, bytes.Length);
            fs.Close();
            string str = Encoding.UTF8.GetString(bytes);
            Debug.Log(str);
        }
    }
}

以流形式讀取文檔

通過IO命名空間下的StreamReader類以流形式讀取文檔：

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        //流形式讀取文檔
        using (StreamReader sr = new StreamReader(path))
        {
            string content = sr.ReadToEnd();
            sr.Close();
            sr.Dispose();
            Debug.Log(content);
        }
    }
}

還可以使用File類的OpenText()函數以流形式讀取文檔：

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        //流形式讀取文檔
        using (StreamReader sr = File.OpenText(path))
        {
            string content = sr.ReadToEnd();
            sr.Close();
            sr.Dispose();
            Debug.Log(content);
        }
    }
}

修改數據保存文檔  通過File類寫入數據

還記得怎么讀取數據嗎？
File.ReadAllText()函數及ReadAllLines()函數
那么寫入數據就使用：
File.WriteAllText()函數及ReadWriteLines()函數

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        File.WriteAllText(path, "測試數據");
    }
}

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        string[] content = { "測試數據1", "測試數據2", "測試數據3" };
        File.WriteAllLines(path, content);
    }
}

WriteAllText()是將整個文本保存到文檔中。
ReadWriteLines()函數是將一個string數組保存到文檔中。

通過文件流的形式寫入數據

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        string content = "測試文檔";
        //文件流形式讀取文檔
        using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Write))
        {
            byte[] bytes = Encoding.UTF8.GetBytes(content);
            fs.Write(bytes, 0, bytes.Length);
            fs.Close();
        }
    }
}

通過流形式寫入數據

using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;

public class Demo5 : MonoBehaviour
{
    void Start()
    {
        string path = Application.streamingAssetsPath + "/TextRead.txt";
        string content = "測試文檔";
        using (StreamWriter sr = new StreamWriter(path))
        {
            sr.WriteLine(content);
            sr.Close();
            sr.Dispose();
            Debug.Log(content);
        }
    }
}

這些讀取的操作都需要引入IO命名空間。

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