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Override all write/flush methods on NullTextWriter #83293

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merged 2 commits into from
Mar 13, 2023
Merged

Override all write/flush methods on NullTextWriter #83293

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767536e
Override all write/flush methods on NullTextWriter
stephentoub Mar 11, 2023
a1efee6
Merge branch 'dotnet:main' into nulltextwriter
stephentoub Mar 12, 2023
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85 changes: 56 additions & 29 deletions src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -656,39 +656,66 @@ public virtual Task FlushAsync()

private sealed class NullTextWriter : TextWriter
{
internal NullTextWriter()
{
}
internal NullTextWriter() { }

public override IFormatProvider FormatProvider => CultureInfo.InvariantCulture;

public override Encoding Encoding => Encoding.Unicode;

public override void Write(char[] buffer, int index, int count)
{
}

public override void Write(string? value)
{
}

// Not strictly necessary, but for perf reasons
public override void WriteLine()
{
}

// Not strictly necessary, but for perf reasons
public override void WriteLine(string? value)
{
}

public override void WriteLine(object? value)
{
}

public override void Write(char value)
{
}
// To avoid all unnecessary overhead in the base, override all Flush/Write methods as pure nops.

public override void Flush() { }
public override Task FlushAsync() => Task.CompletedTask;

public override void Write(char value) { }
public override void Write(char[]? buffer) { }
public override void Write(char[] buffer, int index, int count) { }
public override void Write(ReadOnlySpan<char> buffer) { }
public override void Write(bool value) { }
public override void Write(int value) { }
public override void Write(uint value) { }
public override void Write(long value) { }
public override void Write(ulong value) { }
public override void Write(float value) { }
public override void Write(double value) { }
public override void Write(decimal value) { }
public override void Write(string? value) { }
public override void Write(object? value) { }
public override void Write(StringBuilder? value) { }
public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0) { }
public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1) { }
public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1, object? arg2) { }
public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params object?[] arg) { }
public override Task WriteAsync(char value) => Task.CompletedTask;
public override Task WriteAsync(string? value) => Task.CompletedTask;
public override Task WriteAsync(StringBuilder? value, CancellationToken cancellationToken = default) => Task.CompletedTask;
public override Task WriteAsync(char[] buffer, int index, int count) => Task.CompletedTask;
public override Task WriteAsync(ReadOnlyMemory<char> buffer, CancellationToken cancellationToken = default) => Task.CompletedTask;
public override void WriteLine() { }
public override void WriteLine(char value) { }
public override void WriteLine(char[]? buffer) { }
public override void WriteLine(char[] buffer, int index, int count) { }
public override void WriteLine(ReadOnlySpan<char> buffer) { }
public override void WriteLine(bool value) { }
public override void WriteLine(int value) { }
public override void WriteLine(uint value) { }
public override void WriteLine(long value) { }
public override void WriteLine(ulong value) { }
public override void WriteLine(float value) { }
public override void WriteLine(double value) { }
public override void WriteLine(decimal value) { }
public override void WriteLine(string? value) { }
public override void WriteLine(StringBuilder? value) { }
public override void WriteLine(object? value) { }
public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0) { }
public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1) { }
public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1, object? arg2) { }
public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params object?[] arg) { }
public override Task WriteLineAsync(char value) => Task.CompletedTask;
public override Task WriteLineAsync(string? value) => Task.CompletedTask;
public override Task WriteLineAsync(StringBuilder? value, CancellationToken cancellationToken = default) => Task.CompletedTask;
public override Task WriteLineAsync(char[] buffer, int index, int count) => Task.CompletedTask;
public override Task WriteLineAsync(ReadOnlyMemory<char> buffer, CancellationToken cancellationToken = default) => Task.CompletedTask;
public override Task WriteLineAsync() => Task.CompletedTask;
}

public static TextWriter Synchronized(TextWriter writer)
Expand Down