StringWriter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / IO / StringWriter.cs / 1305376 / StringWriter.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  StringWriter 
**
** [....] 
**
** Purpose: For writing text to a string
**
** 
===========================================================*/
 
using System; 
using System.Runtime;
using System.Text; 
using System.Globalization;
using System.Diagnostics.Contracts;

namespace System.IO { 
    // This class implements a text writer that writes to a string buffer and allows
    // the resulting sequence of characters to be presented as a string. 
    // 
    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)] 
    public class StringWriter : TextWriter
    {
        private static UnicodeEncoding m_encoding=null;
 
        private StringBuilder _sb;
        private bool _isOpen; 
 
        // Constructs a new StringWriter. A new StringBuilder is automatically
        // created and associated with the new StringWriter. 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif
        public StringWriter() 
            : this(new StringBuilder(), CultureInfo.CurrentCulture) {
        } 
 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public StringWriter(IFormatProvider formatProvider)
            : this(new StringBuilder(), formatProvider) {
        } 

        // Constructs a new StringWriter that writes to the given StringBuilder. 
        // 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public StringWriter(StringBuilder sb) : this(sb, CultureInfo.CurrentCulture) {
        }
 
        public StringWriter(StringBuilder sb, IFormatProvider formatProvider) : base(formatProvider) {
            if (sb==null) 
                throw new ArgumentNullException("sb", Environment.GetResourceString("ArgumentNull_Buffer")); 
            Contract.EndContractBlock();
            _sb = sb; 
            _isOpen = true;
        }

#if !FEATURE_CORECLR 
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif 
        public override void Close() 
        {
            Dispose(true); 
        }

#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        protected override void Dispose(bool disposing) 
        { 
            // Do not destroy _sb, so that we can extract this after we are
            // done writing (similar to MemoryStream's GetBuffer & ToArray methods) 
            _isOpen = false;
            base.Dispose(disposing);
        }
 

        public override Encoding Encoding { 
#if !FEATURE_CORECLR 
            [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif 
            get {
                if (m_encoding==null) {
                    m_encoding = new UnicodeEncoding(false, false);
                } 
                return m_encoding;
            } 
        } 

        // Returns the underlying StringBuilder. This is either the StringBuilder 
        // that was passed to the constructor, or the StringBuilder that was
        // automatically created.
        //
        public virtual StringBuilder GetStringBuilder() { 
            return _sb;
        } 
 
        // Writes a character to the underlying string buffer.
        // 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif
        public override void Write(char value) { 
            if (!_isOpen)
                __Error.WriterClosed(); 
            _sb.Append(value); 
        }
 
        // Writes a range of a character array to the underlying string buffer.
        // This method will write count characters of data into this
        // StringWriter from the buffer character array starting at position
        // index. 
        //
        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"));
            Contract.EndContractBlock(); 
 
            if (!_isOpen)
                __Error.WriterClosed(); 

            _sb.Append(buffer, index, count);
        }
 
        // Writes a string to the underlying string buffer. If the given string is
        // null, nothing is written. 
        // 
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] 
#endif
        public override void Write(String value) {
            if (!_isOpen)
                __Error.WriterClosed(); 
            if (value != null) _sb.Append(value);
        } 
 
        // Returns a string containing the characters written to this TextWriter
        // so far. 
        //
#if !FEATURE_CORECLR
        [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
#endif 
        public override String ToString() {
            return _sb.ToString(); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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StringWriter.cs source code in C# .NET

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