Discussion :

[livinho38]

Bonjour

je travail avec VS2008 et silverlight 3
je dispose coté client d'un datagrid, il est créé avec un datatable (creation coté client de classe permetantd'avoir des datatable coté client je sais pas si sa a son importance mais je prefer le preciser)

j'aimerai pouvoir exporter sur excel (format XLS) les données contenue dans mon datagrid.

j'ai pas mal tourner mais impossible de trouver une solution qui convient.

je ne vois pas d'inconvéniant ( a part techniquement ) a que sa soit fait coté serveur ou coté client.

En esperant que vous aurez des solutions.

[livinho38]

je me permet de relancer cette discution, car apres de nombreuse recherche je n'ai pas trouver de solutions....

coté client ou serveur ce n'est pa un pb !!

[Pragmateek]

Une méthode simple est de transformer les données au format CSV qui est directement interprétable par Excel.

Il me semble que FileHelpers (http://filehelpers.sourceforge.net/) est une bonne lib pour le traitement CSV.

[MasterSleepy]

Salut,

J'ai eu les mêmes besoins récemment.
J'ai créé un webservice qui me convertir des données sous formes de tableau en fichier xls en utilisant l'api excel.
Si tu as Office 2007 ou supérieur, tu peux produire un xml.
J'avais trouvé cette class sur internet, mais je sais plus trop ou.

Code :

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using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Reflection;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
 
namespace Excel.Business
{
    /// <summary>
    /// Class that handle Export to XML that are compliant with Excel 2007 or higher.
    /// </summary>
    public static class ExcelXml
    {
        /// <summary>
        /// Export the given DataGrid to Excel XML.
        /// </summary>
        /// <param name="myGrid">Datagrid to export.</param>
        public static void ExportToExcelXml(DataGrid myGrid)
        {
            if (myGrid.ItemsSource == null)
            {
                MessageBox.Show("No Data to export!");
                return;
            }
 
            SaveFileDialog objSFD = new SaveFileDialog() { DefaultExt = "xml", Filter = "Excel XML (*.xml)|*.xml|CSV Files (*.csv)|*.csv|All files (*.*)|*.*", FilterIndex = 1 };
            if (objSFD.ShowDialog() == true)
            {
                MessageBoxResult res = MessageBox.Show("Full export ?", "Export type", MessageBoxButton.OKCancel);
                if (res == MessageBoxResult.OK)
                {
                    ExportFullSource(objSFD, myGrid);
                }
                else
                {
                    ExportDataGrid(objSFD, myGrid);
                }
            }
        }
 
        /// <summary>
        /// Export the entire source of the datagrid to Excel.
        /// </summary>
        /// <param name="objSFD">Object that contains the name of the file that will have datas.</param>
        /// <param name="myGrid">Datagrid to export.</param>
        private static void ExportFullSource(SaveFileDialog objSFD, DataGrid myGrid)
        {
            bool firstRow = true;
 
            LinkedList<string> columns = new LinkedList<string>();
 
            string strFormat = objSFD.SafeFileName.Substring(objSFD.SafeFileName.IndexOf('.') + 1).ToUpper();
            StringBuilder strBuilder = new StringBuilder();
            List<string> lstFields = new List<string>();
 
            try
            {
                foreach (object data in myGrid.ItemsSource)
                {
                    Type objectType = data.GetType();
                    if (firstRow)
                    {
                        foreach (PropertyInfo item in objectType.GetProperties())
                        {
                            columns.AddLast(item.Name);
                            lstFields.Add(FormatField(item.Name, strFormat));
                        }
                        BuildStringOfRow(strBuilder, lstFields, strFormat);
                        firstRow = false;
                    }
                    lstFields.Clear();
                    foreach (string itemProp in columns)
                    {
                        PropertyInfo f = objectType.GetProperty(itemProp);
                        if (f.GetValue(data, null) == null)
                        {
                            lstFields.Add(FormatField(string.Empty, strFormat));
                        }
                        else
                        {
                            lstFields.Add(FormatField(f.GetValue(data, null).ToString(), strFormat));
                        }
                    }
                    BuildStringOfRow(strBuilder, lstFields, strFormat);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                WriteExcelXmlFile(objSFD, strFormat, strBuilder);
                MessageBox.Show("Export Done!!!");
            }
        }
 
        /// <summary>
        /// Export visible datas to an excel sheet.
        /// </summary>
        /// <param name="objSFD">Object that contains the name of the file that will have datas.</param>
        /// <param name="myGrid">Datagrid to export.</param>
        private static void ExportDataGrid(SaveFileDialog objSFD, DataGrid myGrid)
        {
            string strFormat = objSFD.SafeFileName.Substring(objSFD.SafeFileName.IndexOf('.') + 1).ToUpper();
            StringBuilder strBuilder = new StringBuilder();
            List<string> lstFields = new List<string>();
 
            if (myGrid.HeadersVisibility == DataGridHeadersVisibility.Column || myGrid.HeadersVisibility == DataGridHeadersVisibility.All)
            {
                foreach (DataGridColumn dgcol in myGrid.Columns)
                {
                    lstFields.Add(FormatField(dgcol.Header.ToString(), strFormat));
                }
                BuildStringOfRow(strBuilder, lstFields, strFormat);
            }
            try
            {
                foreach (object data in myGrid.ItemsSource)
                {
                    lstFields.Clear();
                    foreach (DataGridColumn col in myGrid.Columns)
                    {
                        string strValue = string.Empty;
                        Binding objBinding = null;
                        if (col is DataGridBoundColumn)
                        {
                            objBinding = (col as DataGridBoundColumn).Binding;
                        }
                        if (col is DataGridTemplateColumn)
                        {
                            // This is a template column... let us see the underlying dependency object
                            try
                            {
                                DependencyObject objDO = (col as DataGridTemplateColumn).CellTemplate.LoadContent();
 
                                FrameworkElement oFE = (FrameworkElement)objDO;
                                FieldInfo oFI = oFE.GetType().GetField("TextProperty");
                                if (oFI != null)
                                {
                                    if (oFI.GetValue(null) != null)
                                    {
                                        if (oFE.GetBindingExpression((DependencyProperty)oFI.GetValue(null)) != null)
                                        {
                                            objBinding = oFE.GetBindingExpression((DependencyProperty)oFI.GetValue(null)).ParentBinding;
                                        }
                                    }
                                }
                            }
                            catch 
                            { 
                                objBinding = null; 
                            }
                        }
                        if (objBinding != null)
                        {
                            if (objBinding.Path.Path != string.Empty)
                            {
                                PropertyInfo pi = data.GetType().GetProperty(objBinding.Path.Path);
                                if (pi != null)
                                {
                                    strValue = pi.GetValue(data, null).ToString();
                                }
                            }
                            if (objBinding.Converter != null)
                            {
                                if (strValue != string.Empty)
                                {
                                    strValue = objBinding.Converter.Convert(strValue, typeof(string), objBinding.ConverterParameter, objBinding.ConverterCulture).ToString();
                                }
                                else
                                {
                                    strValue = objBinding.Converter.Convert(data, typeof(string), objBinding.ConverterParameter, objBinding.ConverterCulture).ToString();
                                }
                            }
                        }
                        lstFields.Add(FormatField(strValue, strFormat));
                    }
                    BuildStringOfRow(strBuilder, lstFields, strFormat);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return;
            }
            WriteExcelXmlFile(objSFD, strFormat, strBuilder);
            MessageBox.Show("Export Done!!!");
        }
 
        /// <summary>
        /// Write to Excel XML file.
        /// </summary>
        /// <param name="objSFD">Object that contains destination filename.</param>
        /// <param name="strFormat">XML to indicate the destination is a XML file, otherwise it is a CSV file.</param>
        /// <param name="strBuilder">Datas well formatted.</param>
        private static void WriteExcelXmlFile(SaveFileDialog objSFD, string strFormat, StringBuilder strBuilder)
        {
            StreamWriter sw = new StreamWriter(objSFD.OpenFile());
            if (strFormat == "XML")
            {
                // Let us write the headers for the Excel XML
                sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
                sw.WriteLine("<?mso-application progid=\"Excel.Sheet\"?>");
                sw.WriteLine("<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\">");
                sw.WriteLine("<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">");
                sw.WriteLine("<Author>" + App.Current.Host.InitParams["UserName"].ToString() + "</Author>");
                sw.WriteLine("<Created>" + DateTime.Now.ToLocalTime().ToLongDateString() + "</Created>");
                sw.WriteLine("<LastSaved>" + DateTime.Now.ToLocalTime().ToLongDateString() + "</LastSaved>");
                sw.WriteLine("<Company>My Company</Company>");
                sw.WriteLine("<Version>12.00</Version>");
                sw.WriteLine("</DocumentProperties>");
                sw.WriteLine("<Worksheet ss:Name=\"Excel Export\" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\">");
                sw.WriteLine("<Table>");
            }
            sw.Write(strBuilder.ToString());
            if (strFormat == "XML")
            {
                sw.WriteLine("</Table>");
                sw.WriteLine("</Worksheet>");
                sw.WriteLine("</Workbook>");
            }
            sw.Close();
        }
 
        /// <summary>
        /// Build the destination string.
        /// </summary>
        /// <param name="strBuilder">Destination buffer.</param>
        /// <param name="lstFields">Collection of string that contains row datas.</param>
        /// <param name="strFormat">Format of the destination file. Xml or Csv.</param>
        private static void BuildStringOfRow(StringBuilder strBuilder, List<string> lstFields, string strFormat)
        {
            switch (strFormat)
            {
                case "XML":
                    strBuilder.AppendLine("<Row>");
                    strBuilder.AppendLine(String.Join("\r\n", lstFields.ToArray()));
                    strBuilder.AppendLine("</Row>");
                    break;
                case "CSV":
                    strBuilder.AppendLine(String.Join(",", lstFields.ToArray()));
                    break;
            }
        }
 
        /// <summary>
        /// Format field regarding destination file format.
        /// </summary>
        /// <param name="data">Data to fomat.</param>
        /// <param name="format">Format of the destination file. Xml or CSV.</param>
        /// <returns>Formatted field.</returns>
        private static string FormatField(string data, string format)
        {
            switch (format)
            {
                case "XML":
                    return String.Format("<Cell><Data ss:Type=\"String\">{0}</Data></Cell>", data);
                case "CSV":
                    return String.Format("\"{0}\"", data.Replace("\"", "\"\"\"").Replace("\n", string.Empty).Replace("\r", string.Empty));
            }
            return data;
        }
    }
}

A+,
MasterSleepy.