WPF及Silverlight中将DataGrid数据导出

///   <summary>
     ///  数据源导出辅助类
     ///   </summary>
     ///   <remarks>
     ///  Author:         sucsy
     ///  Create date:    2011-6-17
     ///  Description:    提供基于数据源(公共枚举器类型)的数据导出辅助功能
     ///   </remarks>
     public  class DataSourceExportHelper
    {
         ///   <summary>
         ///  导出到文本
         ///   </summary>
         ///   <param name="dataSource"> 数据源 </param>
         ///   <param name="splitString"> 分隔符 </param>
         ///   <param name="columns"> 导出的列（为null时表示全部导出） </param>
         ///   <returns> 文本数据 </returns>
         public  static  string Export2Text(IEnumerable dataSource, string splitString,DataGridColumn[] columns, bool isVisiableColumn)
        {
             // 定义结果存放对象
            StringBuilder sbResult =  new StringBuilder();

             string[] columnHeaders = GetSelectedColumns(columns);

             // 处理DataTable作为数据源的数据导出操作
             if (dataSource  is System.Data.DataView)
            {
                System.Data.DataView dataView = (System.Data.DataView)dataSource;

                 // 加载数据标题
                 foreach (DataColumn objHeaderpi  in dataView.Table.Columns)
                {
                     if (columns ==  null || columnHeaders.Contains(objHeaderpi.ColumnName))
                        sbResult.Append(objHeaderpi.ColumnName + splitString);
                }

                sbResult.AppendLine();

                 foreach (System.Data.DataRowView dr  in dataView)
                {
                     foreach (DataColumn objHeaderpi  in dataView.Table.Columns)
                    {
                         if (columns ==  null || columnHeaders.Contains(objHeaderpi.ColumnName))
                            sbResult.Append(dr[objHeaderpi.ColumnName].ToString() + splitString);
                    }
                    sbResult.AppendLine();
                }
            }
             else
            {               
                 foreach (DataGridColumn dgcol  in columns)
                    sbResult.Append(dgcol.Header.ToString() + splitString);

                sbResult.AppendLine();

                 foreach ( object data  in dataSource)
                {
                     foreach (DataGridColumn col  in columns)
                    {
                         string strValue =  "";
                        Binding objBinding =  null;
                         if (col  is DataGridBoundColumn)
                            objBinding = (Binding)(col  as DataGridBoundColumn).Binding;

                         if (col  is DataGridTemplateColumn)
                        {
                            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 !=  "")
                            {
                                 string[] dataTree = objBinding.Path.Path.Split( " . ".ToArray(), StringSplitOptions.RemoveEmptyEntries);
                                 object parentData = data;
                                 for ( int treeIndex =  0; treeIndex < dataTree.Length; treeIndex++)
                                {
                                    PropertyInfo pData = parentData.GetType().GetProperty(dataTree[treeIndex]);

                                    parentData = pData.GetValue(parentData,  null);
                                }

                                 if (parentData !=  null) strValue = parentData.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,  typeof( string), objBinding.ConverterParameter, objBinding.ConverterCulture).ToString();
                            }
                        }                       
                        sbResult.Append(strValue.Replace( ' , ',  ' ， ') + splitString);
                    }
                    sbResult.AppendLine();
                }

            }

             return sbResult.ToString();
        }
         public  static  string[] GetSelectedColumns(DataGridColumn[] columns)
        {
            List< string> columnsHeader =  new List< string>();
             foreach (DataGridColumn column  in columns)
            {
                 if (column.Visibility == System.Windows.Visibility.Visible)
                    columnsHeader.Add(column.Header.ToString());
            }

             return columnsHeader.ToArray();
        }



         ///   <summary>
         ///  导出为平面文本
         ///   </summary>
         ///   <param name="dataSource"> 数据源 </param>
         ///   <param name="columns"> 选择要导出的列 </param>
         ///   <returns> 平面文本 </returns>
         public  static  string Export2FlotText(IEnumerable dataSource,DataGridColumn[] columns, bool isVisiableColumn)
        {
             return Export2Text(dataSource,  " \t ", columns, isVisiableColumn);
        }

         ///   <summary>
         ///  导出为平面文本
         ///   </summary>
         ///   <param name="dataSource"> 数据源 </param>
         ///   <param name="columns"> 选择要导出的列 </param>
         ///   <returns> 平面文本 </returns>
         public  static  string Export2FlotCSV(IEnumerable dataSource,DataGridColumn[] columns, bool isVisiableColumn)
        {
             return Export2Text(dataSource,  " , ", columns, isVisiableColumn);
        }
    }