WPF datagrid incollando

Question

Ho problemi incolla da un CSV in DataGrid WPF - Ho seguito i suggerimenti qui

http://blogs.msdn.com/b/vinsibal/archive/2008/09/25/pasting-content-to-new-rows-on-the-wpf-datagrid.aspx

ei exectues codice con nessun problema - tuttavia, sembra che tutto il vengono create nuove righe ma solo la prima riga viene popolata con i dati. I dati sembrano essere costantemente sovrascritti in modo che l'ultimo elemento presente nei dati degli appunti sia popolato nella prima riga e tutte le altre righe siano vuote. So che questo deve essere un problema di indice o qualcosa del genere ma non riesco a rintracciarlo.

Anche quando guardo gli oggetti nella raccolta associabile della griglia nessuno di loro ha alcun dato. C'è qualcosa nell'OnPastingCellClipboardContent della colonna che sta andando male (conversione dei dati forse)?

Tutte le idee (si veda il codice qui sotto)

protected virtual void OnExecutedPaste(object sender, ExecutedRoutedEventArgs args) 
    { 
     // parse the clipboard data 
     List<string[]> rowData = ClipboardHelper.ParseClipboardData(); 
     bool hasAddedNewRow = false; 

     // call OnPastingCellClipboardContent for each cell 
     int minRowIndex = Math.Max(Items.IndexOf(CurrentItem), 0); 
     int maxRowIndex = Items.Count - 1; 
     int minColumnDisplayIndex = (SelectionUnit != DataGridSelectionUnit.FullRow) ? Columns.IndexOf(CurrentColumn) : 0; 
     int maxColumnDisplayIndex = Columns.Count - 1; 

     int rowDataIndex = 0; 
     for (int i = minRowIndex; i <= maxRowIndex && rowDataIndex < rowData.Count; i++, rowDataIndex++) 
     { 
      if (CanUserAddRows && i == maxRowIndex) 
      { 
       // add a new row to be pasted to 
       ICollectionView cv = CollectionViewSource.GetDefaultView(Items); 
       IEditableCollectionView iecv = cv as IEditableCollectionView; 
       if (iecv != null) 
       { 
        hasAddedNewRow = true; 
        iecv.AddNew(); 
        if (rowDataIndex + 1 < rowData.Count) 
        { 
         // still has more items to paste, update the maxRowIndex 
         maxRowIndex = Items.Count - 1; 
        } 
       } 
      } 
      else if (i == maxRowIndex) 
      { 
       continue; 
      } 

      int columnDataIndex = 0; 
      for (int j = minColumnDisplayIndex; j < maxColumnDisplayIndex && columnDataIndex < rowData[rowDataIndex].Length; j++, columnDataIndex++) 
      { 
       DataGridColumn column = ColumnFromDisplayIndex(j); 
       column.OnPastingCellClipboardContent(Items[i], rowData[rowDataIndex][columnDataIndex]); 
      } 
     } 

}

Answer 1

Per chi fosse interessato - ci sembra essere qualcosa di sbagliato con le colonne tentano di aggiornare il valore dell'oggetto associabile - possibile conversione del tipo di dati quindi l'ho implementato io stesso e ora funziona come un incantesimo.

protected virtual void OnExecutedPaste(object sender, ExecutedRoutedEventArgs args) 
    { 
     // parse the clipboard data 
     List<string[]> rowData = ClipboardHelper.ParseClipboardData(); 
     bool hasAddedNewRow = false; 

     // call OnPastingCellClipboardContent for each cell 
     int minRowIndex = Math.Max(Items.IndexOf(CurrentItem), 0); 
     int maxRowIndex = Items.Count - 1; 
     int minColumnDisplayIndex = (SelectionUnit != DataGridSelectionUnit.FullRow) ? Columns.IndexOf(CurrentColumn) : 0; 
     int maxColumnDisplayIndex = Columns.Count - 1; 

     int rowDataIndex = 0; 
     for (int i = minRowIndex; i <= maxRowIndex && rowDataIndex < rowData.Count; i++, rowDataIndex++) 
     { 
      if (CanUserAddRows && i == maxRowIndex) 
      { 
       // add a new row to be pasted to 
       ICollectionView cv = CollectionViewSource.GetDefaultView(Items); 
       IEditableCollectionView iecv = cv as IEditableCollectionView; 
       if (iecv != null) 
       { 
        hasAddedNewRow = true; 
        iecv.AddNew(); 
        if (rowDataIndex + 1 < rowData.Count) 
        { 
         // still has more items to paste, update the maxRowIndex 
         maxRowIndex = Items.Count - 1; 
        } 
       } 
      } 
      else if (i == maxRowIndex) 
      { 
       continue; 
      } 

      int columnDataIndex = 0; 
      for (int j = minColumnDisplayIndex; j < maxColumnDisplayIndex && columnDataIndex < rowData[rowDataIndex].Length; j++, columnDataIndex++) 
      { 
       DataGridColumn column = ColumnFromDisplayIndex(j); 
       string propertyName = ((column as DataGridBoundColumn).Binding as Binding).Path.Path; 
       object item = Items[i]; 
       object value = rowData[rowDataIndex][columnDataIndex]; 
       PropertyInfo pi = item.GetType().GetProperty(propertyName); 
       if (pi != null) 
       { 
        object convertedValue = Convert.ChangeType(value, pi.PropertyType); 
        item.GetType().GetProperty(propertyName).SetValue(item, convertedValue, null);      
       } 
       //column.OnPastingCellClipboardContent(item, rowData[rowDataIndex][columnDataIndex]); 
      } 
     } 

}

Answer 2

Grazie,

Il post è molto buona di Vincent, ma KlausG aggiunto alcune correzioni in esso che dovrebbero anche essere considerati a lavorare con Framework 4.0. Molto importante

post originale del sito Web da Vincent: http://blogs.msdn.com/b/vinsibal/archive/2008/09/25/pasting-content-to-new-rows-on-the-wpf-datagrid.aspx

Nota: se non è possibile aggiungere fila assicurarsi di avere un costruttore di default per il tuo articolo.

aggiornato 2018/03/06 (per supportare DataGrid con colonne riordinate dall'utente)

utilizzo

<myControl:CustomDataGrid ... 

CustomDataGrid

using System; 
using System.Collections.Generic; 
using System.Diagnostics; 
using System.Reflection; 
using System.Text; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Input; 

namespace HQ.Wpf.Util.MyControl 
{ 
    public class CustomDataGrid : DataGrid 
    { 
     public event ExecutedRoutedEventHandler ExecutePasteEvent; 
     public event CanExecuteRoutedEventHandler CanExecutePasteEvent; 

     // ****************************************************************** 
     static CustomDataGrid() 
     { 
      CommandManager.RegisterClassCommandBinding(
       typeof(CustomDataGrid), 
       new CommandBinding(ApplicationCommands.Paste, 
        new ExecutedRoutedEventHandler(OnExecutedPasteInternal), 
        new CanExecuteRoutedEventHandler(OnCanExecutePasteInternal))); 
     } 

     // ****************************************************************** 
     #region Clipboard Paste 

     // ****************************************************************** 
     private static void OnCanExecutePasteInternal(object target, CanExecuteRoutedEventArgs args) 
     { 
      ((CustomDataGrid)target).OnCanExecutePaste(target, args); 
     } 

     // ****************************************************************** 
     /// <summary> 
     /// This virtual method is called when ApplicationCommands.Paste command query its state. 
     /// </summary> 
     /// <param name="args"></param> 
     protected virtual void OnCanExecutePaste(object target, CanExecuteRoutedEventArgs args) 
     { 
      if (CanExecutePasteEvent != null) 
      { 
       CanExecutePasteEvent(target, args); 
       if (args.Handled) 
       { 
        return; 
       } 
      } 

      args.CanExecute = CurrentCell != null; 
      args.Handled = true; 
     } 

     // ****************************************************************** 
     private static void OnExecutedPasteInternal(object target, ExecutedRoutedEventArgs args) 
     { 
      ((CustomDataGrid)target).OnExecutedPaste(target, args); 
     } 

     // ****************************************************************** 
     /// <summary> 
     /// This virtual method is called when ApplicationCommands.Paste command is executed. 
     /// </summary> 
     /// <param name="target"></param> 
     /// <param name="args"></param> 
     protected virtual void OnExecutedPaste(object target, ExecutedRoutedEventArgs args) 
     { 
      if (ExecutePasteEvent != null) 
      { 
       ExecutePasteEvent(target, args); 
       if (args.Handled) 
       { 
        return; 
       } 
      } 

      // parse the clipboard data   [row][column] 
      List<string[]> clipboardData = HQ.Util.General.Clipboard.ClipboardHelper2.ParseClipboardData(); 

      bool hasAddedNewRow = false; 

      Debug.Print(">>> DataGrid Paste: >>>"); 
#if DEBUG 
      StringBuilder sb = new StringBuilder(); 
#endif 
      int minRowIndex = Items.IndexOf(CurrentItem); 
      int maxRowIndex = Items.Count - 1; 
      int startIndexOfDisplayCol = (SelectionUnit != DataGridSelectionUnit.FullRow) ? CurrentColumn.DisplayIndex : 0; 
      int clipboardRowIndex = 0; 
      for (int i = minRowIndex; i <= maxRowIndex && clipboardRowIndex < clipboardData.Count; i++, clipboardRowIndex++) 
      { 
       if (i < this.Items.Count) 
       { 
        CurrentItem = Items[i]; 

        BeginEditCommand.Execute(null, this); 

        int clipboardColumnIndex = 0; 
        for (int j = startIndexOfDisplayCol; clipboardColumnIndex < clipboardData[clipboardRowIndex].Length; j++, clipboardColumnIndex++) 
        { 
         // DataGridColumn column = ColumnFromDisplayIndex(j); 
         DataGridColumn column = null; 
         foreach (DataGridColumn columnIter in this.Columns) 
         { 
          if (columnIter.DisplayIndex == j) 
          { 
           column = columnIter; 
           break; 
          } 
         } 

         column?.OnPastingCellClipboardContent(Items[i], clipboardData[clipboardRowIndex][clipboardColumnIndex]); 

#if DEBUG 
         sb.AppendFormat("{0,-10}", clipboardData[clipboardRowIndex][clipboardColumnIndex]); 
         sb.Append(" - "); 
#endif 
        } 

        CommitEditCommand.Execute(this, this); 
        if (i == maxRowIndex) 
        { 
         maxRowIndex++; 
         hasAddedNewRow = true; 
        } 
       } 

       Debug.Print(sb.ToString()); 
#if DEBUG 
       sb.Clear(); 
#endif 
      } 

      // update selection 
      if (hasAddedNewRow) 
      { 
       UnselectAll(); 
       UnselectAllCells(); 

       CurrentItem = Items[minRowIndex]; 

       if (SelectionUnit == DataGridSelectionUnit.FullRow) 
       { 
        SelectedItem = Items[minRowIndex]; 
       } 
       else if (SelectionUnit == DataGridSelectionUnit.CellOrRowHeader || 
         SelectionUnit == DataGridSelectionUnit.Cell) 
       { 
        SelectedCells.Add(new DataGridCellInfo(Items[minRowIndex], Columns[startIndexOfDisplayCol])); 

       } 
      } 
     } 

     // ****************************************************************** 
     /// <summary> 
     ///  Whether the end-user can add new rows to the ItemsSource. 
     /// </summary> 
     public bool CanUserPasteToNewRows 
     { 
      get { return (bool)GetValue(CanUserPasteToNewRowsProperty); } 
      set { SetValue(CanUserPasteToNewRowsProperty, value); } 
     } 

     // ****************************************************************** 
     /// <summary> 
     ///  DependencyProperty for CanUserAddRows. 
     /// </summary> 
     public static readonly DependencyProperty CanUserPasteToNewRowsProperty = 
      DependencyProperty.Register("CanUserPasteToNewRows", 
             typeof(bool), typeof(CustomDataGrid), 
             new FrameworkPropertyMetadata(true, null, null)); 

     // ****************************************************************** 
     #endregion Clipboard Paste 

     private void SetGridToSupportManyEditEitherWhenValidationErrorExists() 
     { 
      this.Items.CurrentChanged += Items_CurrentChanged; 


      //Type DatagridType = this.GetType().BaseType; 
      //PropertyInfo HasCellValidationProperty = DatagridType.GetProperty("HasCellValidationError", BindingFlags.NonPublic | BindingFlags.Instance); 
      //HasCellValidationProperty. 
     } 

     void Items_CurrentChanged(object sender, EventArgs e) 
     { 
      //this.Items[0]. 
      //throw new NotImplementedException(); 
     } 

     // ****************************************************************** 
     private void SetGridWritable() 
     { 
      Type DatagridType = this.GetType().BaseType; 
      PropertyInfo HasCellValidationProperty = DatagridType.GetProperty("HasCellValidationError", BindingFlags.NonPublic | BindingFlags.Instance); 
      if (HasCellValidationProperty != null) 
      { 
       HasCellValidationProperty.SetValue(this, false, null); 
      } 
     } 

     // ****************************************************************** 
     public void SetGridWritableEx() 
     { 
      BindingFlags bindingFlags = BindingFlags.FlattenHierarchy | BindingFlags.NonPublic | BindingFlags.Instance; 
      PropertyInfo cellErrorInfo = this.GetType().BaseType.GetProperty("HasCellValidationError", bindingFlags); 
      PropertyInfo rowErrorInfo = this.GetType().BaseType.GetProperty("HasRowValidationError", bindingFlags); 
      cellErrorInfo.SetValue(this, false, null); 
      rowErrorInfo.SetValue(this, false, null); 
     } 

     // ****************************************************************** 
    } 
} 

anche: Helper appunti:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Diagnostics; 
using System.Windows; 
using System.IO; 

namespace HQ.Util.General.Clipboard 
{ 
    public static class ClipboardHelper 
    { 
     public delegate string[] ParseFormat(string value); 

     public static List<string[]> ParseClipboardData() 
     { 
      List<string[]> clipboardData = null; 
      object clipboardRawData = null; 
      ParseFormat parseFormat = null; 

      // get the data and set the parsing method based on the format 
      // currently works with CSV and Text DataFormats    
      IDataObject dataObj = System.Windows.Clipboard.GetDataObject(); 
      if ((clipboardRawData = dataObj.GetData(DataFormats.CommaSeparatedValue)) != null) 
      { 
       parseFormat = ParseCsvFormat; 
      } 
      else if((clipboardRawData = dataObj.GetData(DataFormats.Text)) != null) 
      { 
       parseFormat = ParseTextFormat; 
      } 

      if (parseFormat != null) 
      { 
       string rawDataStr = clipboardRawData as string; 

       if (rawDataStr == null && clipboardRawData is MemoryStream) 
       { 
        // cannot convert to a string so try a MemoryStream 
        MemoryStream ms = clipboardRawData as MemoryStream; 
        StreamReader sr = new StreamReader(ms); 
        rawDataStr = sr.ReadToEnd(); 
       } 
       Debug.Assert(rawDataStr != null, string.Format("clipboardRawData: {0}, could not be converted to a string or memorystream.", clipboardRawData)); 

       string[] rows = rawDataStr.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries); 
       if (rows != null && rows.Length > 0) 
       { 
        clipboardData = new List<string[]>(); 
        foreach (string row in rows) 
        { 
         clipboardData.Add(parseFormat(row)); 
        } 
       } 
       else 
       { 
        Debug.WriteLine("unable to parse row data. possibly null or contains zero rows."); 
       } 
      } 

      return clipboardData; 
     } 

     public static string[] ParseCsvFormat(string value) 
     { 
      return ParseCsvOrTextFormat(value, true); 
     } 

     public static string[] ParseTextFormat(string value) 
     { 
      return ParseCsvOrTextFormat(value, false); 
     } 

     private static string[] ParseCsvOrTextFormat(string value, bool isCSV) 
     { 
      List<string> outputList = new List<string>(); 

      char separator = isCSV ? ',' : '\t'; 
      int startIndex = 0; 
      int endIndex = 0; 

      for (int i = 0; i < value.Length; i++) 
      { 
       char ch = value[i]; 
       if (ch == separator) 
       { 
        outputList.Add(value.Substring(startIndex, endIndex - startIndex)); 

        startIndex = endIndex + 1; 
        endIndex = startIndex; 
       } 
       else if (ch == '\"' && isCSV) 
       { 
        // skip until the ending quotes 
        i++; 
        if (i >= value.Length) 
        { 
         throw new FormatException(string.Format("value: {0} had a format exception", value)); 
        } 
        char tempCh = value[i]; 
        while (tempCh != '\"' && i < value.Length) 
         i++; 

        endIndex = i; 
       } 
       else if (i + 1 == value.Length) 
       { 
        // add the last value 
        outputList.Add(value.Substring(startIndex)); 
        break; 
       } 
       else 
       { 
        endIndex++; 
       } 
      } 

      return outputList.ToArray(); 
     } 
    } 
} 

CsvHelper.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text.RegularExpressions; 
using MoreLinq; // http://stackoverflow.com/questions/15265588/how-to-find-item-with-max-value-using-linq 

namespace HQ.Util.General.CSV 
{ 
    public class CsvHelper 
    { 
     public static Dictionary<LineSeparator, Func<string, string[]>> DictionaryOfLineSeparatorAndItsFunc = new Dictionary<LineSeparator, Func<string, string[]>>(); 

     static CsvHelper() 
     { 
      DictionaryOfLineSeparatorAndItsFunc[LineSeparator.Unknown] = ParseLineNotSeparated; 
      DictionaryOfLineSeparatorAndItsFunc[LineSeparator.Tab] = ParseLineTabSeparated; 
      DictionaryOfLineSeparatorAndItsFunc[LineSeparator.Semicolon] = ParseLineSemicolonSeparated; 
      DictionaryOfLineSeparatorAndItsFunc[LineSeparator.Comma] = ParseLineCommaSeparated; 
     } 

     // ****************************************************************** 
     public enum LineSeparator 
     { 
      Unknown = 0, 
      Tab, 
      Semicolon, 
      Comma 
     } 

     // ****************************************************************** 
     public static LineSeparator GuessCsvSeparator(string oneLine) 
     { 
      List<Tuple<LineSeparator, int>> listOfLineSeparatorAndThereFirstLineSeparatedValueCount = new List<Tuple<LineSeparator, int>>(); 

      listOfLineSeparatorAndThereFirstLineSeparatedValueCount.Add(new Tuple<LineSeparator, int>(LineSeparator.Tab, CsvHelper.ParseLineTabSeparated(oneLine).Count())); 
      listOfLineSeparatorAndThereFirstLineSeparatedValueCount.Add(new Tuple<LineSeparator, int>(LineSeparator.Semicolon, CsvHelper.ParseLineSemicolonSeparated(oneLine).Count())); 
      listOfLineSeparatorAndThereFirstLineSeparatedValueCount.Add(new Tuple<LineSeparator, int>(LineSeparator.Comma, CsvHelper.ParseLineCommaSeparated(oneLine).Count())); 

      Tuple<LineSeparator, int> bestBet = listOfLineSeparatorAndThereFirstLineSeparatedValueCount.MaxBy((n)=>n.Item2); 

      if (bestBet != null && bestBet.Item2 > 1) 
      { 
       return bestBet.Item1; 
      } 

      return LineSeparator.Unknown; 
     } 

     // ****************************************************************** 
     public static string[] ParseLineCommaSeparated(string line) 
     { 
      // CSV line parsing : From "jgr4" in http://www.kimgentes.com/worshiptech-web-tools-page/2008/10/14/regex-pattern-for-parsing-csv-files-with-embedded-commas-dou.html 
      var matches = Regex.Matches(line, @"\s?((?<x>(?=[,]+))|""(?<x>([^""]|"""")+)""|""(?<x>)""|(?<x>[^,]+)),?", 
             RegexOptions.ExplicitCapture); 

      string[] values = (from Match m in matches 
           select m.Groups["x"].Value.Trim().Replace("\"\"", "\"")).ToArray(); 

      return values; 
     } 

     // ****************************************************************** 
     public static string[] ParseLineTabSeparated(string line) 
     { 
      var matchesTab = Regex.Matches(line, @"\s?((?<x>(?=[\t]+))|""(?<x>([^""]|"""")+)""|""(?<x>)""|(?<x>[^\t]+))\t?", 
          RegexOptions.ExplicitCapture); 

      string[] values = (from Match m in matchesTab 
           select m.Groups["x"].Value.Trim().Replace("\"\"", "\"")).ToArray(); 

      return values; 
     } 

     // ****************************************************************** 
     public static string[] ParseLineSemicolonSeparated(string line) 
     { 
      // CSV line parsing : From "jgr4" in http://www.kimgentes.com/worshiptech-web-tools-page/2008/10/14/regex-pattern-for-parsing-csv-files-with-embedded-commas-dou.html 
      var matches = Regex.Matches(line, @"\s?((?<x>(?=[;]+))|""(?<x>([^""]|"""")+)""|""(?<x>)""|(?<x>[^;]+));?", 
             RegexOptions.ExplicitCapture); 

      string[] values = (from Match m in matches 
           select m.Groups["x"].Value.Trim().Replace("\"\"", "\"")).ToArray(); 

      return values; 
     } 

     // ****************************************************************** 
     public static string[] ParseLineNotSeparated(string line) 
     { 
      string [] lineValues = new string[1]; 
      lineValues[0] = line; 
      return lineValues; 
     } 

     // ****************************************************************** 
     public static List<string[]> ParseText(string text) 
     { 
      string[] lines = text.Split(new string[] { "\r\n" }, StringSplitOptions.None); 
      return ParseString(lines); 
     } 

     // ****************************************************************** 
     public static List<string[]> ParseString(string[] lines) 
     { 
      List<string[]> result = new List<string[]>(); 

      LineSeparator lineSeparator = LineSeparator.Unknown; 
      if (lines.Any()) 
      { 
       lineSeparator = GuessCsvSeparator(lines[0]); 
      } 

      Func<string, string[]> funcParse = DictionaryOfLineSeparatorAndItsFunc[lineSeparator]; 

      foreach (string line in lines) 
      { 
       if (string.IsNullOrWhiteSpace(line)) 
       { 
        continue; 
       } 

       result.Add(funcParse(line)); 
      } 

      return result; 
     } 

     // ****************************************************************** 
    } 
} 

ClipboardHelper2.cs

using System; 
using System.Collections.Generic; 
using System.Diagnostics; 
using System.Runtime.InteropServices; 
using System.Text.RegularExpressions; 
using System.Windows; 
using System.IO; 
using System.Linq; 
using System.Windows.Forms.VisualStyles; 
using HQ.Util.General.CSV; 

namespace HQ.Util.General.Clipboard 
{ 
    // Uses Clipboard in WPF (PresentationCore.dll in v4 of the framework) 
    public static class ClipboardHelper2 
    { 
     public delegate string[] ParseFormat(string value); 

     public static List<string[]> ParseClipboardData() 
     { 
      List<string[]> clipboardData = new List<string[]>(); 

      // get the data and set the parsing method based on the format 
      // currently works with CSV and Text DataFormats    
      IDataObject dataObj = System.Windows.Clipboard.GetDataObject(); 

      if (dataObj != null) 
      { 
       string[] formats = dataObj.GetFormats(); 
       if (formats.Contains(DataFormats.CommaSeparatedValue)) 
       { 
        string clipboardString = (string)dataObj.GetData(DataFormats.CommaSeparatedValue); 
        { 
         // EO: Subject to error when a CRLF is included as part of the data but it work for the moment and I will let it like it is 
         // WARNING ! Subject to errors 
         string[] lines = clipboardString.Split(new string[] { "\r\n" }, StringSplitOptions.None); 

         string[] lineValues; 
         foreach (string line in lines) 
         { 
          lineValues = CsvHelper.ParseLineCommaSeparated(line); 
          if (lineValues != null) 
          { 
           clipboardData.Add(lineValues); 
          } 
         } 
        } 
       } 
       else if (formats.Contains(DataFormats.Text)) 
       { 
        string clipboardString = (string)dataObj.GetData(DataFormats.Text); 
        clipboardData = CsvHelper.ParseText(clipboardString); 
       } 
      } 

      return clipboardData; 
     } 
    } 
} 

Answer 3

Se ho ragione si dovrebbe anche bisogno di un test di ricezione per j variabile:

  for (int j = minColumnDisplayIndex; j <= maxColumnDisplayIndex && columnDataIndex < rowData[rowDataIndex].Length; j++, columnDataIndex++) 
      { 
       if (j == maxColumnDisplayIndex) 
        continue; 
       DataGridColumn column = ColumnFromDisplayIndex(j); 
       column.OnPastingCellClipboardContent(Items[i], rowData[rowDataIndex][columnDataIndex]); 
      } 

In caso contrario si ottiene un ArgumentOutOfRangeException quando incollare il contenuto con più colonne che la griglia può effettivamente contenere.