C#•10mo ago•

56 replies

✅ StreamReader returns empty string on valid file stream

I have this code:

            using var reader = new StreamReader(stream, Encoding.UTF8, false, 0x400, true);
            str = reader.ReadToEnd();

            using var reader = new StreamReader(stream, Encoding.UTF8, false, 0x400, true);
            str = reader.ReadToEnd();

After this,

str

str

is empty. The stream, however, is valid. The

Length

Length

property matches the length of the file, it was opened with the

Read

Read

permission and the

CanRead

CanRead

property is

true

true

. The position was at

, and has not been advanced and is still at

after the read. The attached screenshot shows the

stream

stream

(and

str

str

) variables after the

ReadToEnd

ReadToEnd

call.

To make sure the stream is valid, I added this after the

ReadToEnd

ReadToEnd

        using var temp = File.Open(@"C:\log\bla", FileMode.Create, FileAccess.Write, FileShare.None);
        stream.CopyTo(temp);

        using var temp = File.Open(@"C:\log\bla", FileMode.Create, FileAccess.Write, FileShare.None);
        stream.CopyTo(temp);

And this correctly writes the full file, in all its glory, to the provided location, which should confirm that the issue is not with the stream itself, and all file permissions of the stream have been set correctly.

I'm using .NET Framework 4.8.

What could be the issue here?

C#•10mo ago•

56 replies

zed

✅ StreamReader returns empty string on valid file stream

I have this code:

            using var reader = new StreamReader(stream, Encoding.UTF8, false, 0x400, true);
            str = reader.ReadToEnd();

            using var reader = new StreamReader(stream, Encoding.UTF8, false, 0x400, true);
            str = reader.ReadToEnd();

After this,

str

str

is empty. The stream, however, is valid. The

Length

Length

property matches the length of the file, it was opened with the

Read

Read

permission and the

CanRead

CanRead

property is

true

true

. The position was at

, and has not been advanced and is still at

after the read. The attached screenshot shows the

stream

stream

(and

str

str

) variables after the

ReadToEnd

ReadToEnd

call.

To make sure the stream is valid, I added this after the

ReadToEnd

ReadToEnd

        using var temp = File.Open(@"C:\log\bla", FileMode.Create, FileAccess.Write, FileShare.None);
        stream.CopyTo(temp);

        using var temp = File.Open(@"C:\log\bla", FileMode.Create, FileAccess.Write, FileShare.None);
        stream.CopyTo(temp);

✅ StreamReader returns empty string on valid file stream

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