原文地址:http://highoncoding.com/Articles/483_Exporting_GridView_to_PDF_Document.aspx
首先创建实体类:
public class Customer
{
private string _firstName;
private string _lastName;
private string _email;
public string FirstName
{
get { return _firstName; }
set { _firstName = value; }
}
public string LastName
{
get { return _lastName; }
set { _lastName = value; }
}
public string FullName
{
get { return _firstName + " " + _lastName; }
}
public string Email
{
get { return _email; }
set { _email = value; }
}
}
创建一个gridview和生成一些虚拟数据。
<asp:GridView BackColor="Green" ID="gvCustomers" runat="server" />
private void BindData()
{
gvCustomers.DataSource = GetCustomers();
gvCustomers.DataBind();
}
private List<Customer> GetCustomers()
{
List<Customer> customers = new List<Customer>();
for (int i = 1; i <= 20; i++)
{
Customer customer = new Customer();
customer.FirstName = "FirstName" + i;
customer.LastName = "LastName" + i;
customer.Email = "Email" + i;
customers.Add(customer);
}
return customers;
}
生成如下图所示的gridview和数据
错误的生成PDF的方法：
protected void WrongExportGridViewToPDF(object sender, EventArgs e)
{
Response.Clear();
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gvCustomers.RenderControl(htw);
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment; filename=MypdfFile.pdf");
Response.Write(sw.ToString());
Response.End();
}
为了生成pdf我们需要使用第三方库ITextSharp
下载地址请点击链接。
ITextSharp Library
我们将使用ITextSharp库输出文档到 ResponeOutputStream. 我们看一下下面的代码:
protected void ExportToPDFClick(object sender, EventArgs e)
{
Response.Clear();
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
HtmlTextWriter htw = new HtmlTextWriter(sw);
gvCustomers.RenderControl(htw);
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment; filename=MypdfFile.pdf");
Document document = new Document();
PdfWriter.GetInstance(document, Response.OutputStream);
document.Open();
string html = sb.ToString();
XmlTextReader reader = new XmlTextReader(new StringReader(html));
HtmlParser.Parse(document, reader);
document.Close();
sw.Close();
Response.Flush();
Response.End();
}
上面的代码用Document对象代表一个PDF文档，gridview被翻译成HtmlTextWriter.HtmlTextWriter使用StringWriter and StringBuilder 来获得GridView的html 。 PdrWriter.getInstance 用于设置Document 实例转化为输出流。 HtmlParser 类负责转化显示的iGridView的HTML。 这是为了使PDF文档以表格形式的呈现 .如果你遗漏了 使用HtmlParser ，原始的HTML将会呈现在PDF文档中。
看一下下方的呈现为PDF文档Gridview的截图：
你能看到表格的样式不好看，我们来看看怎么改变表格的呈现。
ITextSharp 库包含用来创建表格的Table 类，我们用Table类改进我们的呈现。按钮的点击事件的代码如下
protected void ExportCollectionToPDFClick(object sender,EventArgs e)
{
ExportToPDFCollection(new string[] { "FirstName", "LastName", "FullName" });
}
ExportToPDFCollection方法是用Customer集合创建表格。他的每个参数是我们想要输出到PDF文档的列的名字。
这里是ExportToPDFCollection 方法的实现：
private void ExportToPDFCollection(string[] columnNames)
{
List<Customer> customers = GetCustomers();
int noOfColumns = columnNames.Length;
int noOfRows = customers.Count;
string propertyValue = String.Empty;
iTextSharp.text.Table table = new iTextSharp.text.Table(noOfColumns, noOfRows);
table.BackgroundColor = new iTextSharp.text.Color(gvCustomers.BackColor);
table.AutoFillEmptyCells = true;
for (int rowNo = 0; rowNo < noOfRows; rowNo++)
{
for (int columnNo = 0; columnNo < noOfColumns; columnNo++)
{
propertyValue = GetPropertyValue(customers[rowNo], columnNames[columnNo]);
table.AddCell(propertyValue, new Point(rowNo, columnNo));
}
}
Document document = new Document();
PdfWriter.GetInstance(document, Response.OutputStream);
document.Open();
document.Add(table);
document.Close();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment; filename=MypdfFile.pdf");
Response.End();
}
上面的代码创建了表格然后添加单元格，每个单元格是由Customer类的属性名构成。GetPropertyValue 方法使用反射获得属性的值。
private string GetPropertyValue(Customer customer,string propertyName)
{
PropertyInfo property = customer.GetType().GetProperty(propertyName);
return property.GetValue(customer, null).ToString();
}
这就是结果：
尽管pdf文档不是十分美观但是你能做出调整使他美观。记住单元格是根据属性列出来的。
结论:
这篇文章我们学习了怎么输出Gridview成PDF.我们讨论了不同的方法去实现这个操作。在以后的文章里我们将演示怎么样自定义输出的PDF文档的呈现。
[下载例子]
