DataGridClipboardHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Controls / DataGridClipboardHelper.cs / 1305600 / DataGridClipboardHelper.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Collections.Generic; 
using System.Globalization;
using System.IO; 
using System.Text;
using System.Windows;

namespace System.Windows.Controls 
{
    internal static class DataGridClipboardHelper 
    { 
        private const string DATAGRIDVIEW_htmlPrefix = "Version:1.0\r\nStartHTML:00000097\r\nEndHTML:{0}\r\nStartFragment:00000133\r\nEndFragment:{1}\r\n";
        private const string DATAGRIDVIEW_htmlStartFragment = "\r\n\r\n"; 
        private const string DATAGRIDVIEW_htmlEndFragment = "\r\n\r\n\r\n";

        internal static void FormatCell(object cellValue, bool firstCell, bool lastCell, StringBuilder sb, string format)
        { 
            bool csv = string.Equals(format, DataFormats.CommaSeparatedValue, StringComparison.OrdinalIgnoreCase);
            if (csv || string.Equals(format, DataFormats.Text, StringComparison.OrdinalIgnoreCase) 
                || string.Equals(format, DataFormats.UnicodeText, StringComparison.OrdinalIgnoreCase)) 
            {
                if (cellValue != null) 
                {
                    bool escapeApplied = false;
                    int length = sb.Length;
                    FormatPlainText(cellValue.ToString(), csv, new StringWriter(sb, CultureInfo.CurrentCulture), ref escapeApplied); 
                    if (escapeApplied)
                    { 
                        sb.Insert(length, '"'); 
                    }
                } 

                if (lastCell)
                {
                    // Last cell 
                    sb.Append('\r');
                    sb.Append('\n'); 
                } 
                else
                { 
                    sb.Append(csv ? ',' : '\t');
                }
            }
            else if (string.Equals(format, DataFormats.Html, StringComparison.OrdinalIgnoreCase)) 
            {
                if (firstCell) 
                { 
                    // First cell - append start of row
                    sb.Append(""); 
                }

                sb.Append(""); // Start cell
                if (cellValue != null) 
                {
                    FormatPlainTextAsHtml(cellValue.ToString(), new StringWriter(sb, CultureInfo.CurrentCulture)); 
                } 
                else
                { 
                    sb.Append(" ");
                }

                sb.Append(""); // End cell 
                if (lastCell)
                { 
                    // Last cell - append end of row 
                    sb.Append("");
                } 
            }
        }

        internal static void GetClipboardContentForHtml(StringBuilder content) 
        {
            content.Insert(0, ""); 
            content.Append("
"); 

            // Marshal.SystemDefaultCharSize is 2 on WinXP Pro - so the offsets seem to be in character counts instead of bytes. 
            int bytecountEndOfFragment = 135 + content.Length;
            int bytecountEndOfHtml = bytecountEndOfFragment + 36;
            string prefix = string.Format(CultureInfo.InvariantCulture, DATAGRIDVIEW_htmlPrefix, bytecountEndOfHtml.ToString("00000000", CultureInfo.InvariantCulture), bytecountEndOfFragment.ToString("00000000", CultureInfo.InvariantCulture)) + DATAGRIDVIEW_htmlStartFragment;
            content.Insert(0, prefix); 
            content.Append(DATAGRIDVIEW_htmlEndFragment);
        } 
 
        private static void FormatPlainText(string s, bool csv, TextWriter output, ref bool escapeApplied)
        { 
            if (s != null)
            {
                int length = s.Length;
                for (int i = 0; i < length; i++) 
                {
                    char ch = s[i]; 
                    switch (ch) 
                    {
                        case '\t': 
                            if (!csv)
                            {
                                output.Write(' ');
                            } 
                            else
                            { 
                                output.Write('\t'); 
                            }
 
                            break;

                        case '"':
                            if (csv) 
                            {
                                output.Write("\"\""); 
                                escapeApplied = true; 
                            }
                            else 
                            {
                                output.Write('"');
                            }
 
                            break;
 
                        case ',': 
                            if (csv)
                            { 
                                escapeApplied = true;
                            }

                            output.Write(','); 
                            break;
 
                        default: 
                            output.Write(ch);
                            break; 
                    }
                }

                if (escapeApplied) 
                {
                    output.Write('"'); 
                } 
            }
        } 

        // Code taken from ASP.NET file xsp\System\Web\httpserverutility.cs; same in DataGridViewCell.cs
        private static void FormatPlainTextAsHtml(string s, TextWriter output)
        { 
            if (s == null)
            { 
                return; 
            }
 
            int cb = s.Length;
            char prevCh = '\0';

            for (int i = 0; i < cb; i++) 
            {
                char ch = s[i]; 
                switch (ch) 
                {
                    case '<': 
                        output.Write("<");
                        break;
                    case '>':
                        output.Write(">"); 
                        break;
                    case '"': 
                        output.Write("""); 
                        break;
                    case '&': 
                        output.Write("&");
                        break;
                    case ' ':
                        if (prevCh == ' ') 
                        {
                            output.Write(" "); 
                        } 
                        else
                        { 
                            output.Write(ch);
                        }

                        break; 
                    case '\r':
                        // Ignore \r, only handle \n 
                        break; 
                    case '\n':
                        output.Write("
"); 
                        break;

                    //
                    default: 
                        // The seemingly arbitrary 160 comes from RFC
                        if (ch >= 160 && ch < 256) 
                        { 
                            output.Write("&#");
                            output.Write(((int)ch).ToString(NumberFormatInfo.InvariantInfo)); 
                            output.Write(';');
                        }
                        else
                        { 
                            output.Write(ch);
                        } 
 
                        break;
                } 

                prevCh = ch;
            }
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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