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c#streamreadertextreader
Roger Layton
Roger Layton

Reputation: 1651

No EndOfStream check on TextReader

I found that this problem is not addressed in this knowledge base and decided to add the question and the answer to help others.

I am creating a TextReader to read through a text file line by line using ReadLine, which requires a termination check for the end of this stream.

TextReader TR = new TextReader("MyFile.txt");
while (!TR.EndOfStream) // fails to compile here
{
    // do something
}

The EndOfStream does not exist for the TextReader class and this code will not compile.

Upvotes: 1

Views: 318

Answers (1)

Roger Layton
Roger Layton

Reputation: 1651

The solution is relatively simple but may be missed by those new to C# and the .NET libraries (as well as experts who write code too quickly!).

The TextReader class is subclassed from StreamReader, and it is this latter class which provides the common functionality for all of its child classes.

Thus the solution is to declare the reader as a StreamReader, and then to instantiate it as a TextReader.

StreamReader TR = new TextReader("MyFile.txt");
while (!TR.EndOfStream) // it finds this property now
{
// do something
}

Upvotes: -1

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