[Solved] Why might File.ReadAllLines throw an exception when reading a large file? - Ans: It loads entire file into memory, causing OutOfMemoryException | C Sharp (C#)

C Sharp (C#) - File IO

Why might File.ReadAllLines throw an exception when reading a large file?

AIt requires a StreamReader instance to work

BIt loads entire file into memory, causing OutOfMemoryException

CIt only reads the first line and ignores the rest

DIt automatically deletes the file after reading

Step-by-Step Solution

Solution:

Step 1: Understand ReadAllLines behavior
ReadAllLines loads all lines into a string array in memory at once.
Step 2: Consider large file impact
For very large files, this can exhaust memory and cause OutOfMemoryException.
Step 3: Evaluate other options
It reads all lines, does not need StreamReader instance, and does not delete files.
Final Answer:
It loads entire file into memory, causing OutOfMemoryException -> Option B
Quick Check:
Large file + ReadAllLines = memory risk [OK]

Quick Trick: ReadAllLines loads whole file in memory; large files risk errors [OK]

Common Mistakes:

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