Silverlight下“DataGrid”和“Pdf”导出

     首先，Silverlight下的“DataGrid”控件多少让人有些失望，它没有集成导出功能。而对于“PDF”的导出，一般是先将文件转化为“图片”格式，然后再按照“PDF”格式导出，可以采用“SilverPDF”组件。但是再这两者导出时，不可避免的都会遇到两种问题，第一“DataGrid”导出“Excel”汉字容易乱码，第二“图片”转为“PDF”，图片过大的话，“PDF”以“A4”的大小会显示不全。

     下面是自己整理的两种“DataGrid”和“Excel”的导出方法，希望和大家分享。

              #region 导出到PDF

        /// <summary>
        /// 导出到PDF
        /// </summary>
        public  static void ExportToPdf(Chart SLChart)
        {
            //int chartwidth = SLChart.Width;
            //int chartheight = SLChart.Height;

            //Chart chartreport = SLChart.Clone();

            //SLChart.Margin = new Thickness(100, 100, 100, 100);

            SLChart.Width = 600;
            SLChart.Height = 250;
            //SLChart.Visibility = Visibility.Collapsed;

            SaveFileDialog d = new SaveFileDialog();
            d.Filter = "PDF file format|*.pdf";

            // Save the document...
            if (d.ShowDialog() == true)
            {
                // Create a new PDF document
                PdfDocument document = new PdfDocument();

                // Create an empty page
                PdfPage page = document.AddPage();
                //page.Contents.CreateSingleContent().Stream.UnfilteredValue;

                // Get an XGraphics object for drawing
                XGraphics gfx = XGraphics.FromPdfPage(page);

                XPdfFontOptions options = new XPdfFontOptions(PdfFontEncoding.Unicode, PdfFontEmbedding.Always);

                // Create a font
                XFont font = new XFont("Huxtable", 20, XFontStyle.Bold, options);

                //WriteableBitmap wb = new WriteableBitmap(SLChart, null);

                WriteableBitmap bitmap = new WriteableBitmap(SLChart, null);

                MemoryStream stream = Common.GetImageStream(bitmap);
                //byte[] b = Convert.FromBase64String(GetBase64Image(wb));
                //MemoryStream ms = new MemoryStream(b);
                XImage img = XImage.FromStream(stream);


                gfx.DrawImage(img, 0, 0, SLChart.ActualWidth, SLChart.ActualHeight);

                //PdfDocumentSettings pdfsetting = new PdfDocumentSettings();
                //PdfReal pr = new PdfReal();

                document.Save(d.OpenFile());

                stream.Close();
                stream.Dispose();

               

                ////SLChart.Margin = new Thickness(0, 0, 0, 0);

                //SLChart.Visibility = Visibility.Visible;
            }

            SLChart.Width = double.NaN;
            SLChart.Height = double.NaN;

        }

        #endregion

        #region 导出DataGrid数据到Excel

        /// <summary>
        /// CSV格式化
        /// </summary>
        /// <param name="data">数据</param>
        /// <returns>格式化数据</returns>
        private static string FormatCsvField(string data)
        {
            return String.Format("\"{0}\"", data.Replace("\"", "\"\"\"").Replace("\n", "").Replace("\r", ""));
        }

        /// <summary>
        /// 导出DataGrid数据到Excel
        /// </summary>
        /// <param name="withHeaders">是否需要表头</param>
        /// <param name="grid">DataGrid</param>
        /// <returns>Excel内容字符串</returns>
        public static string ExportDataGrid(bool withHeaders, DataGrid grid)
        {

            System.Reflection.PropertyInfo propInfo;
            System.Windows.Data.Binding binding;
            var strBuilder = new System.Text.StringBuilder();
            var source = (grid.ItemsSource as System.Collections.IList);
            if (source == null) return "";
            var headers = new List<string>();
            grid.Columns.ToList().ForEach(col =>
            {
                if (col is DataGridBoundColumn)
                { headers.Add(FormatCsvField(col.Header.ToString())); }
            });
            strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
            foreach (Object data in source)
            {
                var csvRow = new List<string>();
                foreach (DataGridColumn col in grid.Columns)
                {
                    if (col is DataGridBoundColumn)
                    {
                        binding = (col as DataGridBoundColumn).Binding;
                        string colPath = binding.Path.Path;
                        propInfo = data.GetType().GetProperty(colPath);
                        if (propInfo != null)
                        {
                            csvRow.Add(FormatCsvField("," + propInfo.GetValue(data, null).ToString()));
                        }
                    }
                }
                strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
            }
            return strBuilder.ToString();
        }

        /// <summary>
        /// 导出DataGrid数据到Excel
        /// </summary>
        /// <param name="withHeaders">是否需要表头</param>
        /// <param name="grid">DataGrid</param>
        /// <param name="dataBind"></param>
        /// <returns>Excel内容字符串</returns>
        public static string ExportDataGrid(bool withHeaders, DataGrid grid, bool dataBind)
        {
            var strBuilder = new System.Text.StringBuilder();
            var source = (grid.ItemsSource as System.Collections.IList);
            if (source == null) return "";
            var headers = new List<string>();
            grid.Columns.ToList().ForEach(col =>
            {
                if (col is DataGridTemplateColumn)
                {
                    headers.Add(col.Header != null ? FormatCsvField(col.Header.ToString()) : string.Empty);
                }
            });
            strBuilder.Append(String.Join(",", headers.ToArray())).Append("\r\n");
            foreach (Object data in source)
            {
                var csvRow = new List<string>();
                foreach (DataGridColumn col in grid.Columns)
                {
                    if (col is DataGridTemplateColumn)
                    {
                        FrameworkElement cellContent = col.GetCellContent(data);
                        TextBlock block;
                        if (cellContent.GetType() == typeof(Grid))
                        {
                            block = cellContent.FindName("TempTextblock") as TextBlock;
                        }
                        else
                        {
                            block = cellContent as TextBlock;
                        }
                        if (block != null)
                        {
                            csvRow.Add(FormatCsvField(block.Text));
                        }
                    }
                }
                strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\r\n");
                //strBuilder.Append(String.Join(",", csvRow.ToArray())).Append("\t");
            }
            return strBuilder.ToString();
        }
        /// <summary>
        /// 导出DataGrid数据到Excel为CVS文件
        /// 使用utf8编码 中文是乱码 改用Unicode编码
        ///  
        /// </summary>
        /// <param name="withHeaders">是否带列头</param>
        /// <param name="grid">DataGrid</param>
        public static void ExportDataGridSaveAs(bool withHeaders, DataGrid grid)
        {
            string data = ExportDataGrid(true, grid);
            var sfd = new SaveFileDialog
            {
                DefaultExt = "csv",
                Filter = "CSV Files (*.csv)|*.csv|All files (*.*)|*.*",
                FilterIndex = 1
            };
            if (sfd.ShowDialog() == true)
            {
                using (Stream stream = sfd.OpenFile())
                {
                    using (var writer = new StreamWriter(stream, System.Text.Encoding.Unicode))
                    {
                        data = data.Replace(",", "\t");
                        writer.Write(data);
                        writer.Close();
                    }
                    stream.Close();
                }
            }
        }

        #endregion 导出DataGrid数据到Excel