Read stream twice without missing data

I want to grab the first byte from a file and then read the entire file (max. 128 bytes) starting from the beginning, including that first byte. However, the problem is that the first byte I initially read is missing. Here's the code:

var bytesRead = await file.ReadAsync(new byte[1]);

// Check bytesRead
// ...

file.Seek(0, SeekOrigin.Begin);

byte[] buffer = new byte[128];
await file.ReadAsync(buffer, 0, buffer.Length);

var bytesRead = await file.ReadAsync(new byte[1]);

// Check bytesRead
// ...

file.Seek(0, SeekOrigin.Begin);

byte[] buffer = new byte[128];
await file.ReadAsync(buffer, 0, buffer.Length);

Any ideas on how to fix this?

C#•3y ago•

77 replies

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Read stream twice without missing data

var bytesRead = await file.ReadAsync(new byte[1]);

// Check bytesRead
// ...

file.Seek(0, SeekOrigin.Begin);

byte[] buffer = new byte[128];
await file.ReadAsync(buffer, 0, buffer.Length);

var bytesRead = await file.ReadAsync(new byte[1]);

// Check bytesRead
// ...

file.Seek(0, SeekOrigin.Begin);

byte[] buffer = new byte[128];
await file.ReadAsync(buffer, 0, buffer.Length);

Any ideas on how to fix this?

Read stream twice without missing data

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