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Home Forums How do you handle encoding when reading or writing to text files? – MindStick
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ICSM Computer
ICSM Computer 01 Jun 2025
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Handling encoding correctly when reading or writing text files in .NET is critical for ensuring data integrity, especially with non-ASCII characters or cross-platform compatibility.

✅ Key Points on Handling Encoding

1. Specify Encoding Explicitly

Always specify the encoding when reading or writing, unless you're sure the default (UTF-8 without BOM) works for your scenario.

Writing Text with Encoding

Using File.WriteAllText:

string text = "Hello, world — 你好，世界";
File.WriteAllText("file.txt", text, Encoding.UTF8); // or Encoding.Unicode, etc.

Using StreamWriter:

using (var writer = new StreamWriter("file.txt", false, Encoding.UTF8))
{
    writer.WriteLine("Some text");
}

Common Encodings:

  1. Encoding.UTF8 – Universal, default for many apps
  2. Encoding.Unicode – UTF-16 LE
  3. Encoding.ASCII – 7-bit ASCII only (loses non-ASCII characters)
  4. Encoding.GetEncoding("ISO-8859-1") – Western European (legacy)
  5. new UTF8Encoding(encoderShouldEmitUTF8Identifier: true) – With BOM

Reading Text with Encoding

Using File.ReadAllText:

string content = File.ReadAllText("file.txt", Encoding.UTF8);

Using StreamReader:

using (var reader = new StreamReader("file.txt", Encoding.UTF8))
{
    string content = reader.ReadToEnd();
}

Detecting Encoding Automatically (BOM-based):

using (var reader = new StreamReader("file.txt", detectEncodingFromByteOrderMarks: true))
{
    string content = reader.ReadToEnd();
}

If you're unsure about the encoding, setting detectEncodingFromByteOrderMarks: true can help detect UTF-8/UTF-16 with BOM.

Example: Writing and Reading Unicode Text

string text = "Text with emoji and Chinese 中文";

// Write with UTF-8
File.WriteAllText("unicode.txt", text, Encoding.UTF8);

// Read it back
string readBack = File.ReadAllText("unicode.txt", Encoding.UTF8);

Common Mistakes

Mistake Problem
Not specifying encoding May cause unreadable characters on other systems or in other programs
Using Encoding.ASCII for Unicode text Non-ASCII characters get lost or replaced
Writing UTF-8 text without BOM when BOM is expected (e.g., in Notepad) File may appear garbled or empty
Reading UTF-16 with UTF-8 Results in mojibake (garbled text)
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