Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / clr / src / BCL / System / IO / StreamWriter.cs / 1 / StreamWriter.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: StreamWriter
**
**
** Purpose: For writing text to streams in a particular
** encoding.
**
**
===========================================================*/
using System;
using System.Text;
using System.Threading;
using System.Globalization;
using System.Runtime.Versioning;
using System.Runtime.Serialization;
namespace System.IO {
// This class implements a TextWriter for writing characters to a Stream.
// This is designed for character output in a particular Encoding,
// whereas the Stream class is designed for byte input and output.
//
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class StreamWriter : TextWriter
{
// For UTF-8, the values of 1K for the default buffer size and 4K for the
// file stream buffer size are reasonable & give very reasonable
// performance for in terms of construction time for the StreamWriter and
// write perf. Note that for UTF-8, we end up allocating a 4K byte buffer,
// which means we take advantage of adaptive buffering code.
// The performance using UnicodeEncoding is acceptable.
private const int DefaultBufferSize = 1024; // char[]
private const int DefaultFileStreamBufferSize = 4096;
private const int MinBufferSize = 128;
// Bit bucket - Null has no backing store. Non closable.
public new static readonly StreamWriter Null = new StreamWriter(Stream.Null, new UTF8Encoding(false, true), MinBufferSize, false);
internal Stream stream;
private Encoding encoding;
private Encoder encoder;
internal byte[] byteBuffer;
internal char[] charBuffer;
internal int charPos;
internal int charLen;
internal bool autoFlush;
private bool haveWrittenPreamble;
private bool closable; // For Console.Out - should Finalize call Dispose?
#if MDA_SUPPORTED
[NonSerialized]
// For StreamWriterBufferedDataLost MDA
private MdaHelper mdaHelper;
#endif
// The high level goal is to be tolerant of encoding errors when we read and very strict
// when we write. Hence, default StreamWriter encoding will throw on encoding error.
// Note: when StreamWriter throws on invalid encoding chars (for ex, high surrogate character
// D800-DBFF without a following low surrogate character DC00-DFFF), it will cause the
// internal StreamWriter's state to be irrecoverable as it would have buffered the
// illegal chars and any subsequent call to Flush() would hit the encoding error again.
// Even Close() will hit the exception as it would try to flush the unwritten data.
// May be we can add a DiscardBufferedData() method to get out of such situation (like
// StreamRerader though for different reason). Eitherway, the buffered data will be lost!
private static Encoding _UTF8NoBOM;
internal static Encoding UTF8NoBOM {
get {
if (_UTF8NoBOM == null) {
// No need for double lock - we just want to avoid extra
// allocations in the common case.
UTF8Encoding noBOM = new UTF8Encoding(false, true);
Thread.MemoryBarrier();
_UTF8NoBOM = noBOM;
}
return _UTF8NoBOM;
}
}
internal StreamWriter(): base(null) { // Ask for CurrentCulture all the time
}
public StreamWriter(Stream stream)
: this(stream, UTF8NoBOM, DefaultBufferSize) {
}
public StreamWriter(Stream stream, Encoding encoding)
: this(stream, encoding, DefaultBufferSize) {
}
// Creates a new StreamWriter for the given stream. The
// character encoding is set by encoding and the buffer size,
// in number of 16-bit characters, is set by bufferSize.
//
public StreamWriter(Stream stream, Encoding encoding, int bufferSize): base(null) { // Ask for CurrentCulture all the time
if (stream==null || encoding==null)
throw new ArgumentNullException((stream==null ? "stream" : "encoding"));
if (!stream.CanWrite)
throw new ArgumentException(Environment.GetResourceString("Argument_StreamNotWritable"));
if (bufferSize <= 0) throw new ArgumentOutOfRangeException("bufferSize", Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
Init(stream, encoding, bufferSize);
}
// For non closable streams such as Console.Out
internal StreamWriter(Stream stream, Encoding encoding, int bufferSize, bool closeable)
: this(stream, encoding, bufferSize) {
closable = closeable;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path)
: this(path, false, UTF8NoBOM, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append)
: this(path, append, UTF8NoBOM, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append, Encoding encoding)
: this(path, append, encoding, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append, Encoding encoding, int bufferSize): base(null) { // Ask for CurrentCulture all the time
if (path==null || encoding==null)
throw new ArgumentNullException((path==null ? "path" : "encoding"));
if (bufferSize <= 0) throw new ArgumentOutOfRangeException("bufferSize", Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
Stream stream = CreateFile(path, append);
Init(stream, encoding, bufferSize);
}
private void Init(Stream stream, Encoding encoding, int bufferSize)
{
this.stream = stream;
this.encoding = encoding;
this.encoder = encoding.GetEncoder();
if (bufferSize < MinBufferSize) bufferSize = MinBufferSize;
charBuffer = new char[bufferSize];
byteBuffer = new byte[encoding.GetMaxByteCount(bufferSize)];
charLen = bufferSize;
// If we're appending to a Stream that already has data, don't write
// the preamble.
if (stream.CanSeek && stream.Position > 0)
haveWrittenPreamble = true;
closable = true;
#if MDA_SUPPORTED
if (Mda.StreamWriterBufferMDAEnabled) {
String callstack = Environment.GetStackTrace(null, false);
mdaHelper = new MdaHelper(this, callstack);
}
#endif
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
private static Stream CreateFile(String path, bool append) {
FileMode mode = append? FileMode.Append: FileMode.Create;
FileStream f = new FileStream(path, mode, FileAccess.Write, FileShare.Read, DefaultFileStreamBufferSize, FileOptions.SequentialScan);
return f;
}
public override void Close() {
Dispose(true);
GC.SuppressFinalize(this);
}
protected override void Dispose(bool disposing) {
try {
// We need to flush any buffered data if we are being closed/disposed.
// Also, we never close the handles for stdout & friends. So we can safely
// write any buffered data to those streams even during finalization, which
// is generally the right thing to do.
if (stream != null) {
// Note: flush on the underlying stream can throw (ex., low disk space)
if (disposing || (!Closable && stream is __ConsoleStream)) {
Flush(true, true);
#if MDA_SUPPORTED
// Disable buffered data loss mda
if (mdaHelper != null)
GC.SuppressFinalize(mdaHelper);
#endif
}
}
}
finally {
// Dispose of our resources if this StreamWriter is closable.
// Note: Console.Out and other such non closable streamwriters should be left alone
if (Closable && stream != null) {
try {
// Attempt to close the stream even if there was an IO error from Flushing.
// Note that Stream.Close() can potentially throw here (may or may not be
// due to the same Flush error). In this case, we still need to ensure
// cleaning up internal resources, hence the finally block.
if (disposing)
stream.Close();
}
finally {
stream = null;
byteBuffer = null;
charBuffer = null;
encoding = null;
encoder = null;
charLen = 0;
base.Dispose(disposing);
}
}
}
}
public override void Flush() {
Flush(true, true);
}
private void Flush(bool flushStream, bool flushEncoder) {
// flushEncoder should be true at the end of the file and if
// the user explicitly calls Flush (though not if AutoFlush is true).
// This is required to flush any dangling characters from our UTF-7
// and UTF-8 encoders.
if (stream == null)
__Error.WriterClosed();
// Perf boost for Flush on non-dirty writers.
if (charPos==0 && !flushStream && !flushEncoder)
return;
if (!haveWrittenPreamble) {
haveWrittenPreamble = true;
byte[] preamble = encoding.GetPreamble();
if (preamble.Length > 0)
stream.Write(preamble, 0, preamble.Length);
}
int count = encoder.GetBytes(charBuffer, 0, charPos, byteBuffer, 0, flushEncoder);
charPos = 0;
if (count > 0)
stream.Write(byteBuffer, 0, count);
// By definition, calling Flush should flush the stream, but this is
// only necessary if we passed in true for flushStream. The Web
// Services guys have some perf tests where flushing needlessly hurts.
if (flushStream)
stream.Flush();
}
public virtual bool AutoFlush {
get { return autoFlush; }
set {
autoFlush = value;
if (value) Flush(true, false);
}
}
public virtual Stream BaseStream {
get { return stream; }
}
internal bool Closable {
get { return closable; }
//set { closable = value; }
}
internal bool HaveWrittenPreamble {
set { haveWrittenPreamble= value; }
}
public override Encoding Encoding {
get { return encoding; }
}
public override void Write(char value) {
if (charPos == charLen) Flush(false, false);
charBuffer[charPos] = value;
charPos++;
if (autoFlush) Flush(true, false);
}
public override void Write(char[] buffer)
{
// This may be faster than the one with the index & count since it
// has to do less argument checking.
if (buffer==null)
return;
int index = 0;
int count = buffer.Length;
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(char[]) isn't making progress! This is most likely a ---- in user code.");
Buffer.InternalBlockCopy(buffer, index*2, charBuffer, charPos*2, n*2);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
public override void Write(char[] buffer, int index, int count) {
if (buffer==null)
throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer"));
if (index < 0)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
if (count < 0)
throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
if (buffer.Length - index < count)
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(char[], int, int) isn't making progress! This is most likely a race condition in user code.");
Buffer.InternalBlockCopy(buffer, index*2, charBuffer, charPos*2, n*2);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
public override void Write(String value) {
if (value != null) {
int count = value.Length;
int index = 0;
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(String) isn't making progress! This is most likely a race condition in user code.");
value.CopyTo(index, charBuffer, charPos, n);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
}
#if false
// This method is more efficient for long strings outputted to streams
// than the one on TextWriter, and won't cause any problems in terms of
// hiding methods on TextWriter as long as languages respect the
// hide-by-name-and-sig metadata flag.
public override void WriteLine(String value) {
if (value != null) {
int count = value.Length;
int index = 0;
while (count > 0) {
if (charPos == charLen) Flush(false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::WriteLine(String) isn't making progress! This is most likely a race condition in user code.");
value.CopyTo(index, charBuffer, charPos, n);
charPos += n;
index += n;
count -= n;
}
}
if (charPos >= charLen - 2) Flush(false);
Buffer.InternalBlockCopy(CoreNewLine, 0, charBuffer, charPos*2, CoreNewLine.Length * 2);
charPos += CoreNewLine.Length;
if (autoFlush) Flush(true, false);
}
#endif
}
#if MDA_SUPPORTED
// StreamWriterBufferedDataLost MDA
// Instead of adding a finalizer to StreamWriter for detecting buffered data loss
// (ie, when the user forgets to call Close/Flush on the StreamWriter), we will
// have a separate object with normal finalization semantics that maintains a
// back pointer to this StreamWriter and alerts about any data loss
sealed class MdaHelper
{
private StreamWriter streamWriter;
private String allocatedCallstack; // captures the callstack when this streamwriter was allocated
internal MdaHelper(StreamWriter sw, String cs)
{
streamWriter = sw;
allocatedCallstack = cs;
}
// Finalizer
~MdaHelper()
{
// Make sure people closed this StreamWriter, exclude StreamWriter::Null.
if (streamWriter.charPos != 0 && streamWriter.stream != null && streamWriter.stream != Stream.Null) {
String fileName = (streamWriter.stream is FileStream) ? ((FileStream)streamWriter.stream).NameInternal : "";
String message = Environment.GetResourceString("IO_StreamWriterBufferedDataLost", streamWriter.stream.GetType().FullName, fileName);
if (allocatedCallstack != null)
message += Environment.NewLine + Environment.GetResourceString("AllocatedFrom") + Environment.NewLine + allocatedCallstack;
Mda.StreamWriterBufferedDataLost(message);
}
}
}
#endif // MDA_SUPPORTED
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: StreamWriter
**
**
** Purpose: For writing text to streams in a particular
** encoding.
**
**
===========================================================*/
using System;
using System.Text;
using System.Threading;
using System.Globalization;
using System.Runtime.Versioning;
using System.Runtime.Serialization;
namespace System.IO {
// This class implements a TextWriter for writing characters to a Stream.
// This is designed for character output in a particular Encoding,
// whereas the Stream class is designed for byte input and output.
//
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class StreamWriter : TextWriter
{
// For UTF-8, the values of 1K for the default buffer size and 4K for the
// file stream buffer size are reasonable & give very reasonable
// performance for in terms of construction time for the StreamWriter and
// write perf. Note that for UTF-8, we end up allocating a 4K byte buffer,
// which means we take advantage of adaptive buffering code.
// The performance using UnicodeEncoding is acceptable.
private const int DefaultBufferSize = 1024; // char[]
private const int DefaultFileStreamBufferSize = 4096;
private const int MinBufferSize = 128;
// Bit bucket - Null has no backing store. Non closable.
public new static readonly StreamWriter Null = new StreamWriter(Stream.Null, new UTF8Encoding(false, true), MinBufferSize, false);
internal Stream stream;
private Encoding encoding;
private Encoder encoder;
internal byte[] byteBuffer;
internal char[] charBuffer;
internal int charPos;
internal int charLen;
internal bool autoFlush;
private bool haveWrittenPreamble;
private bool closable; // For Console.Out - should Finalize call Dispose?
#if MDA_SUPPORTED
[NonSerialized]
// For StreamWriterBufferedDataLost MDA
private MdaHelper mdaHelper;
#endif
// The high level goal is to be tolerant of encoding errors when we read and very strict
// when we write. Hence, default StreamWriter encoding will throw on encoding error.
// Note: when StreamWriter throws on invalid encoding chars (for ex, high surrogate character
// D800-DBFF without a following low surrogate character DC00-DFFF), it will cause the
// internal StreamWriter's state to be irrecoverable as it would have buffered the
// illegal chars and any subsequent call to Flush() would hit the encoding error again.
// Even Close() will hit the exception as it would try to flush the unwritten data.
// May be we can add a DiscardBufferedData() method to get out of such situation (like
// StreamRerader though for different reason). Eitherway, the buffered data will be lost!
private static Encoding _UTF8NoBOM;
internal static Encoding UTF8NoBOM {
get {
if (_UTF8NoBOM == null) {
// No need for double lock - we just want to avoid extra
// allocations in the common case.
UTF8Encoding noBOM = new UTF8Encoding(false, true);
Thread.MemoryBarrier();
_UTF8NoBOM = noBOM;
}
return _UTF8NoBOM;
}
}
internal StreamWriter(): base(null) { // Ask for CurrentCulture all the time
}
public StreamWriter(Stream stream)
: this(stream, UTF8NoBOM, DefaultBufferSize) {
}
public StreamWriter(Stream stream, Encoding encoding)
: this(stream, encoding, DefaultBufferSize) {
}
// Creates a new StreamWriter for the given stream. The
// character encoding is set by encoding and the buffer size,
// in number of 16-bit characters, is set by bufferSize.
//
public StreamWriter(Stream stream, Encoding encoding, int bufferSize): base(null) { // Ask for CurrentCulture all the time
if (stream==null || encoding==null)
throw new ArgumentNullException((stream==null ? "stream" : "encoding"));
if (!stream.CanWrite)
throw new ArgumentException(Environment.GetResourceString("Argument_StreamNotWritable"));
if (bufferSize <= 0) throw new ArgumentOutOfRangeException("bufferSize", Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
Init(stream, encoding, bufferSize);
}
// For non closable streams such as Console.Out
internal StreamWriter(Stream stream, Encoding encoding, int bufferSize, bool closeable)
: this(stream, encoding, bufferSize) {
closable = closeable;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path)
: this(path, false, UTF8NoBOM, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append)
: this(path, append, UTF8NoBOM, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append, Encoding encoding)
: this(path, append, encoding, DefaultBufferSize) {
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public StreamWriter(String path, bool append, Encoding encoding, int bufferSize): base(null) { // Ask for CurrentCulture all the time
if (path==null || encoding==null)
throw new ArgumentNullException((path==null ? "path" : "encoding"));
if (bufferSize <= 0) throw new ArgumentOutOfRangeException("bufferSize", Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
Stream stream = CreateFile(path, append);
Init(stream, encoding, bufferSize);
}
private void Init(Stream stream, Encoding encoding, int bufferSize)
{
this.stream = stream;
this.encoding = encoding;
this.encoder = encoding.GetEncoder();
if (bufferSize < MinBufferSize) bufferSize = MinBufferSize;
charBuffer = new char[bufferSize];
byteBuffer = new byte[encoding.GetMaxByteCount(bufferSize)];
charLen = bufferSize;
// If we're appending to a Stream that already has data, don't write
// the preamble.
if (stream.CanSeek && stream.Position > 0)
haveWrittenPreamble = true;
closable = true;
#if MDA_SUPPORTED
if (Mda.StreamWriterBufferMDAEnabled) {
String callstack = Environment.GetStackTrace(null, false);
mdaHelper = new MdaHelper(this, callstack);
}
#endif
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
private static Stream CreateFile(String path, bool append) {
FileMode mode = append? FileMode.Append: FileMode.Create;
FileStream f = new FileStream(path, mode, FileAccess.Write, FileShare.Read, DefaultFileStreamBufferSize, FileOptions.SequentialScan);
return f;
}
public override void Close() {
Dispose(true);
GC.SuppressFinalize(this);
}
protected override void Dispose(bool disposing) {
try {
// We need to flush any buffered data if we are being closed/disposed.
// Also, we never close the handles for stdout & friends. So we can safely
// write any buffered data to those streams even during finalization, which
// is generally the right thing to do.
if (stream != null) {
// Note: flush on the underlying stream can throw (ex., low disk space)
if (disposing || (!Closable && stream is __ConsoleStream)) {
Flush(true, true);
#if MDA_SUPPORTED
// Disable buffered data loss mda
if (mdaHelper != null)
GC.SuppressFinalize(mdaHelper);
#endif
}
}
}
finally {
// Dispose of our resources if this StreamWriter is closable.
// Note: Console.Out and other such non closable streamwriters should be left alone
if (Closable && stream != null) {
try {
// Attempt to close the stream even if there was an IO error from Flushing.
// Note that Stream.Close() can potentially throw here (may or may not be
// due to the same Flush error). In this case, we still need to ensure
// cleaning up internal resources, hence the finally block.
if (disposing)
stream.Close();
}
finally {
stream = null;
byteBuffer = null;
charBuffer = null;
encoding = null;
encoder = null;
charLen = 0;
base.Dispose(disposing);
}
}
}
}
public override void Flush() {
Flush(true, true);
}
private void Flush(bool flushStream, bool flushEncoder) {
// flushEncoder should be true at the end of the file and if
// the user explicitly calls Flush (though not if AutoFlush is true).
// This is required to flush any dangling characters from our UTF-7
// and UTF-8 encoders.
if (stream == null)
__Error.WriterClosed();
// Perf boost for Flush on non-dirty writers.
if (charPos==0 && !flushStream && !flushEncoder)
return;
if (!haveWrittenPreamble) {
haveWrittenPreamble = true;
byte[] preamble = encoding.GetPreamble();
if (preamble.Length > 0)
stream.Write(preamble, 0, preamble.Length);
}
int count = encoder.GetBytes(charBuffer, 0, charPos, byteBuffer, 0, flushEncoder);
charPos = 0;
if (count > 0)
stream.Write(byteBuffer, 0, count);
// By definition, calling Flush should flush the stream, but this is
// only necessary if we passed in true for flushStream. The Web
// Services guys have some perf tests where flushing needlessly hurts.
if (flushStream)
stream.Flush();
}
public virtual bool AutoFlush {
get { return autoFlush; }
set {
autoFlush = value;
if (value) Flush(true, false);
}
}
public virtual Stream BaseStream {
get { return stream; }
}
internal bool Closable {
get { return closable; }
//set { closable = value; }
}
internal bool HaveWrittenPreamble {
set { haveWrittenPreamble= value; }
}
public override Encoding Encoding {
get { return encoding; }
}
public override void Write(char value) {
if (charPos == charLen) Flush(false, false);
charBuffer[charPos] = value;
charPos++;
if (autoFlush) Flush(true, false);
}
public override void Write(char[] buffer)
{
// This may be faster than the one with the index & count since it
// has to do less argument checking.
if (buffer==null)
return;
int index = 0;
int count = buffer.Length;
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(char[]) isn't making progress! This is most likely a ---- in user code.");
Buffer.InternalBlockCopy(buffer, index*2, charBuffer, charPos*2, n*2);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
public override void Write(char[] buffer, int index, int count) {
if (buffer==null)
throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer"));
if (index < 0)
throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
if (count < 0)
throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
if (buffer.Length - index < count)
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(char[], int, int) isn't making progress! This is most likely a race condition in user code.");
Buffer.InternalBlockCopy(buffer, index*2, charBuffer, charPos*2, n*2);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
public override void Write(String value) {
if (value != null) {
int count = value.Length;
int index = 0;
while (count > 0) {
if (charPos == charLen) Flush(false, false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::Write(String) isn't making progress! This is most likely a race condition in user code.");
value.CopyTo(index, charBuffer, charPos, n);
charPos += n;
index += n;
count -= n;
}
if (autoFlush) Flush(true, false);
}
}
#if false
// This method is more efficient for long strings outputted to streams
// than the one on TextWriter, and won't cause any problems in terms of
// hiding methods on TextWriter as long as languages respect the
// hide-by-name-and-sig metadata flag.
public override void WriteLine(String value) {
if (value != null) {
int count = value.Length;
int index = 0;
while (count > 0) {
if (charPos == charLen) Flush(false);
int n = charLen - charPos;
if (n > count) n = count;
BCLDebug.Assert(n > 0, "StreamWriter::WriteLine(String) isn't making progress! This is most likely a race condition in user code.");
value.CopyTo(index, charBuffer, charPos, n);
charPos += n;
index += n;
count -= n;
}
}
if (charPos >= charLen - 2) Flush(false);
Buffer.InternalBlockCopy(CoreNewLine, 0, charBuffer, charPos*2, CoreNewLine.Length * 2);
charPos += CoreNewLine.Length;
if (autoFlush) Flush(true, false);
}
#endif
}
#if MDA_SUPPORTED
// StreamWriterBufferedDataLost MDA
// Instead of adding a finalizer to StreamWriter for detecting buffered data loss
// (ie, when the user forgets to call Close/Flush on the StreamWriter), we will
// have a separate object with normal finalization semantics that maintains a
// back pointer to this StreamWriter and alerts about any data loss
sealed class MdaHelper
{
private StreamWriter streamWriter;
private String allocatedCallstack; // captures the callstack when this streamwriter was allocated
internal MdaHelper(StreamWriter sw, String cs)
{
streamWriter = sw;
allocatedCallstack = cs;
}
// Finalizer
~MdaHelper()
{
// Make sure people closed this StreamWriter, exclude StreamWriter::Null.
if (streamWriter.charPos != 0 && streamWriter.stream != null && streamWriter.stream != Stream.Null) {
String fileName = (streamWriter.stream is FileStream) ? ((FileStream)streamWriter.stream).NameInternal : "";
String message = Environment.GetResourceString("IO_StreamWriterBufferedDataLost", streamWriter.stream.GetType().FullName, fileName);
if (allocatedCallstack != null)
message += Environment.NewLine + Environment.GetResourceString("AllocatedFrom") + Environment.NewLine + allocatedCallstack;
Mda.StreamWriterBufferedDataLost(message);
}
}
}
#endif // MDA_SUPPORTED
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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- RowVisual.cs
- FontDriver.cs
- WindowsAltTab.cs
- RadioButtonAutomationPeer.cs
- SqlDataSource.cs
- ProvideValueServiceProvider.cs
- PowerStatus.cs
- PropertyPath.cs
- DataSysAttribute.cs
- PropertyChangingEventArgs.cs
- XmlSchemaParticle.cs
- ObjectSecurity.cs
- Region.cs
- WindowsFormsHost.cs
- TextRenderingModeValidation.cs
- Messages.cs
- MarkupCompiler.cs
- DataGridViewColumnCollection.cs
- ApplicationContext.cs
- CodeTypeReferenceExpression.cs
- SoapIgnoreAttribute.cs
- SqlParameter.cs
- IdnElement.cs
- Tuple.cs
- SqlTypesSchemaImporter.cs
- Panel.cs
- ManagementEventArgs.cs
- FormatterServices.cs
- LoginStatusDesigner.cs
- Literal.cs
- RegexNode.cs
- TreeNodeCollection.cs
- TraceProvider.cs
- UnauthorizedWebPart.cs
- ConnectionOrientedTransportChannelFactory.cs
- ProcessHostConfigUtils.cs
- OleDbEnumerator.cs
- Item.cs
- ColumnCollection.cs
- PartialTrustValidationBehavior.cs
- MessageDirection.cs
- BindingList.cs
- SessionParameter.cs
- HttpResponseHeader.cs
- BevelBitmapEffect.cs
- OuterGlowBitmapEffect.cs
- XmlAttribute.cs
- QueryContext.cs
- SqlBulkCopyColumnMappingCollection.cs
- AccessText.cs
- NavigationPropertyEmitter.cs
- EdmComplexPropertyAttribute.cs
- FragmentQueryKB.cs
- BindingExpressionUncommonField.cs
- Journaling.cs
- Span.cs
- BrowserDefinition.cs
- NameGenerator.cs
- ColorBuilder.cs
- WriteableBitmap.cs
- ProcessModule.cs
- OrthographicCamera.cs
- DataDesignUtil.cs
- XmlSerializationWriter.cs
- Parser.cs
- ReferencedCollectionType.cs
- List.cs
- BindableAttribute.cs
- MultiSelector.cs
- ScriptManager.cs
- _LocalDataStore.cs
- WebPartManager.cs
- XmlTextAttribute.cs
- PreProcessor.cs
- SkipStoryboardToFill.cs
- HandledMouseEvent.cs
- DeclarativeCatalogPart.cs
- SqlBuilder.cs
- SqlConnectionHelper.cs
- ValidationError.cs
- WebPartZone.cs
- MachineKeyConverter.cs
- ResourceAssociationTypeEnd.cs
- ProcessModule.cs
- ViewManager.cs
- GridViewRowEventArgs.cs
- UnsafeNativeMethods.cs
- FlowDocument.cs
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- BamlResourceContent.cs
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- DeclarativeConditionsCollection.cs
- TimersDescriptionAttribute.cs
- ClientProtocol.cs
- StateDesigner.cs
- DocumentGrid.cs
- DesignerForm.cs
- ProcessProtocolHandler.cs
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