导出 Silverlight DataGrid to Excel XML/CSV

参考自http://www.codeproject.com/Articles/45731/Export-Silverlight-DataGrid-to-Excel-XML-CSV和http://www.cnblogs.com/itelite/archive/2012/11/28/2792545.html

源码如下：

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;

public static class DataGridExtensions 
{ 
    public static void Export(this DataGrid dg)
    {
        ExportDataGrid(dg);
    }

    public static void ExportDataGrid(DataGrid dGrid)
    {
        SaveFileDialog objSFD = new SaveFileDialog() { DefaultExt = "csv",Filter = "CSV Files (*.csv)|*.csv|Excel XML (*.xml)|*.xml|All files (*.*)|*.*",FilterIndex = 1 };
        if (objSFD.ShowDialog() == true)
        {
            string strFormat = objSFD.SafeFileName.Substring(objSFD.SafeFileName.IndexOf('.') + 1).toupper();
            StringBuilder strBuilder = new StringBuilder();
            if (dGrid.ItemsSource == null) return;
            List<string> lstFields = new List<string>();
            if (dGrid.HeadersVisibility == DataGridHeadersVisibility.Column || dGrid.HeadersVisibility == DataGridHeadersVisibility.All)
            {
                foreach (DataGridColumn dgcol in dGrid.Columns)
                    lstFields.Add(FormatField(dgcol.Header.ToString(),strFormat));
                BuildStringOfRow(strBuilder,lstFields,strFormat);
            }
            foreach (object data in dGrid.ItemsSource)
            {
                lstFields.Clear();
                foreach (DataGridColumn col in dGrid.Columns)
                {
                    string strValue = "";                    
                    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
                        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;
                            }
                        }
                    }
                    if (objBinding != null)
                    {
                        if (objBinding.Path.Path != "")
                        {
                            PropertyInfo pi = data.GetType().GetProperty(objBinding.Path.Path);
                            if (pi != null) strValue = pi.GetValue(data,null).ToString();
                        }
                        if (objBinding.Converter != null)
                        {
                            if (strValue != "")
                                strValue = objBinding.Converter.Convert(strValue,typeof(string),objBinding.ConverterParameter,objBinding.ConverterCulture).ToString();
                            else
                                strValue = objBinding.Converter.Convert(data,objBinding.ConverterCulture).ToString();
                        }
                    }
                    lstFields.Add(FormatField(strValue,strFormat));
                }
                BuildStringOfRow(strBuilder,strFormat);
            }
            StreamWriter sw = new StreamWriter(objSFD.OpenFile(),Encoding.UTF8);
            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>arasu Elango</Author>");
                sw.WriteLine("<Created>" +  DateTime.Now.ToLocalTime().ToLongDateString() + "</Created>");
                sw.WriteLine("<LastSaved>" + DateTime.Now.ToLocalTime().ToLongDateString() + "</LastSaved>");
                sw.WriteLine("<Company>Atom8 IT Solutions (P) Ltd.,</Company>");
                sw.WriteLine("<Version>12.00</Version>");
                sw.WriteLine("</DocumentProperties>");
                sw.WriteLine("<Worksheet ss:Name=\"Silverlight 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();
        }
    }
    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;
        }
    }
    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","").Replace("\r",""));
        }
        return data;
    }
}

源码稍有改动，因为以无BOM格式的UTF8保存的CSV文件用Excel打开会出现中文乱码，所以源码中红色字体代码行必须指定编码为UTF8，如下：

StreamWriter sw = new StreamWriter(objSFD.OpenFile(),Encoding.UTF8);

将上面源码保存为DataGridExtensions.cs文件添加到项目中，在合适的地方调用DataGrid控件的Export()方法即可。