---
title: "What is the difference between FileInfo and the static File class?"  
description: "What is the difference between FileInfo and the static File class?"  
author: "ICSM Computer"  
published: 2025-05-11  
updated: 2025-05-11  
canonical: https://www.mindstick.com/interview/34103/what-is-the-difference-between-fileinfo-and-the-static-file-class  
category: "c#"  
tags: ["c#", "file handling"]  
reading_time: 3 minutes  

---

# What is the difference between FileInfo and the static File class?

The main difference between `FileInfo` and the static `File` class in C# lies in **how they are used** and **their programming style**:

### 1. `FileInfo` – Instance-Based API

1. Requires creating an **object** tied to a specific file.
2. Suitable when you’re working repeatedly with the same file.
3. Properties like `Length`, `Exists`, and `LastWriteTime` are cached (for performance).

```cs
var fileInfo = new FileInfo(@"C:\example.txt");

if (fileInfo.Exists)
{
    Console.WriteLine($"Size: {fileInfo.Length}");
    fileInfo.Delete();
}
```

### 2. `File` – Static Utility Class

1. Provides **static methods** for one-off operations.
2. No need to create an object.
3. Ideal for quick, simple tasks like copying or reading a file.

```cs
if (File.Exists(@"C:\example.txt"))
{
    string text = File.ReadAllText(@"C:\example.txt");
    File.Delete(@"C:\example.txt");
}
```

### Summary Table

| Feature | `FileInfo` | `File` (Static) |
| --- | --- | --- |
| Type | Class (instance-based) | Static class |
| Initialization | Requires `new FileInfo(path)` | No object creation needed |
| Performance | Caches metadata (e.g., `Length`) | No caching — re-reads every time |
| Use Case | Repeated operations on the same file | Simple one-off file tasks |
| Flexibility | Can be extended or mocked | Hard to mock (static methods) |

## Answers

### Answer by ICSM Computer

The main difference between `FileInfo` and the static `File` class in C# lies in **how they are used** and **their programming style**:

### 1. `FileInfo` – Instance-Based API

1. Requires creating an **object** tied to a specific file.
2. Suitable when you’re working repeatedly with the same file.
3. Properties like `Length`, `Exists`, and `LastWriteTime` are cached (for performance).

```cs
var fileInfo = new FileInfo(@"C:\example.txt");

if (fileInfo.Exists)
{
    Console.WriteLine($"Size: {fileInfo.Length}");
    fileInfo.Delete();
}
```

### 2. `File` – Static Utility Class

1. Provides **static methods** for one-off operations.
2. No need to create an object.
3. Ideal for quick, simple tasks like copying or reading a file.

```cs
if (File.Exists(@"C:\example.txt"))
{
    string text = File.ReadAllText(@"C:\example.txt");
    File.Delete(@"C:\example.txt");
}
```

### Summary Table

| Feature | `FileInfo` | `File` (Static) |
| --- | --- | --- |
| Type | Class (instance-based) | Static class |
| Initialization | Requires `new FileInfo(path)` | No object creation needed |
| Performance | Caches metadata (e.g., `Length`) | No caching — re-reads every time |
| Use Case | Repeated operations on the same file | Simple one-off file tasks |
| Flexibility | Can be extended or mocked | Hard to mock (static methods) |


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Original Source: https://www.mindstick.com/interview/34103/what-is-the-difference-between-fileinfo-and-the-static-file-class

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