Question

WPF DataGrid如何分页、导出Excle、打印（急）

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Answer 1

Excel的导出一般采取的方式是获取数据源的数据,然后对数据进行处理,形成CAS字符串的形式导出.具体代码(来自网站codeproject,具体可以搜一下,适应与silverlight对wpf大同小异,请适当修改一下!):
using System;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Controls;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using System.Xml.Linq;

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, typeof(string), objBinding.ConverterParameter, objBinding.ConverterCulture).ToString();
}
}
lstFields.Add(FormatField(strValue,strFormat));
}
BuildStringOfRow(strBuilder, lstFields, strFormat);
}
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>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;
}
}