C# FileInfo類

C# 中的FileInfo類用于處理及操作文件。它提供用于創(chuàng)建，刪除和讀取文件的屬性和方法。 它使用StreamWriter類將文件寫(xiě)入文件。它在System.IO命名空間中定義。

C# FileInfo類聲明

[SerializableAttribute]  
[ComVisibleAttribute(true)]  
public sealed class FileInfo : FileSystemInfo

C# FileInfo構(gòu)造函數(shù)

下表列出FileInfo類的構(gòu)造函數(shù)。

C# FileInfo屬性

下表列出FileInfo類的屬性。

C# FileInfo方法

下表列出FileInfo類中定義的方法。

C# FileInfo示例：創(chuàng)建文件

using System;
using System.IO;
namespace CSharpProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Specifying file location  
                string loc = "F:\\worksp\\csharp\\fileinfo.txt";
                // Creating FileInfo instance  
                FileInfo file = new FileInfo(loc);
                // Creating an empty file  
                file.Create();
                Console.WriteLine("File is created Successfuly");
            }
            catch (IOException e)
            {
                Console.WriteLine("Something went wrong: " + e);
            }
        }
    }
}

執(zhí)行上面示例代碼，得到以下結(jié)果 -

File is created Successfuly

可以在F:\worksp\csharp目錄內(nèi)看到有一個(gè)文件：fileinfo.txt被創(chuàng)建。如下圖中所示 -

C# FileInfo示例：寫(xiě)入文件

using System;
using System.IO;
namespace CSharpProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Specifying file location  
                string loc = "F:\\worksp\\csharp\\fileinfo.txt";
                // Creating FileInfo instance  
                FileInfo file = new FileInfo(loc);
                // Creating an file instance to write  
                StreamWriter sw = file.CreateText();
                // Writing to the file  
                sw.WriteLine("This text is written to the file by using StreamWriter class.");
                sw.Close();
            }
            catch (IOException e)
            {
                Console.WriteLine("Something went wrong: " + e);
            }
        }
    }
}

執(zhí)行上面示例代碼后，打開(kāi)F:\worksp\csharp\fileinfo.txt文件，應(yīng)該會(huì)看到以下內(nèi)容 -

This text is written to the file by using StreamWriter class.

C# FileInfo示例：從文件中讀取文本內(nèi)容

using System;
using System.IO;
namespace CSharpProgram
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Specifying file to read  
                string loc = "F:\\worksp\\csharp\\fileinfo.txt";
                // Creating FileInfo instance  
                FileInfo file = new FileInfo(loc);
                // Opening file to read  
                StreamReader sr = file.OpenText();
                string data = "";
                while ((data = sr.ReadLine()) != null)
                {
                    Console.WriteLine(data);
                }
            }
            catch (IOException e)
            {
                Console.WriteLine("Something went wrong: " + e);
            }
        }
    }
}

執(zhí)行上面示例代碼后，應(yīng)該會(huì)看到以下結(jié)果 -

This text is written to the file by using StreamWriter class.