Aspose.Words使用教程之如何在文档中添加水印

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   有时你需要在一个Word文档中插入一个水印,例如如果你想打印草稿文档或将其标记为机密。

在Microsoft Word中,您可以使用插入水印命令快速插入水印。没有多少人使用这个命令认识到这样的“水印”只是一个形状与文本一起插入到页眉或页脚，或在页面的中心位置。

而在Aspose.Words中，没有单一的“插入水印”命令就像Microsoft Word,它很容易将任何形状或图像插入到页眉或页脚,从而创建一个任何可以想象类型的水印。

Example

把水印插入一个Word文档。

C#
using System;
using System.Drawing;
using System.IO;
using System.Reflection;

using Aspose.Words;
using Aspose.Words.Drawing;
using Aspose.Words.Fields;

namespace AddWatermark
{
public class Program
{
public static void Main(string[] args)
{
// Sample infrastructure.
string exeDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location) + Path.DirectorySeparatorChar;
string dataDir = new Uri(new Uri(exeDir), @"../../Data/").LocalPath;

Document doc = new Document(dataDir + "TestFile.doc");
InsertWatermarkText(doc, "CONFIDENTIAL");
doc.Save(dataDir + "TestFile Out.doc");
}

/// <summary>
/// Inserts a watermark into a document.
/// </summary>
/// <param name="doc">The input document.</param>
/// <param name="watermarkText">Text of the watermark.</param>
private static void InsertWatermarkText(Document doc, string watermarkText)
{
// Create a watermark shape. This will be a WordArt shape.
// You are free to try other shape types as watermarks.
Shape watermark = new Shape(doc, ShapeType.TextPlainText);

// Set up the text of the watermark.
watermark.TextPath.Text = watermarkText;
watermark.TextPath.FontFamily = "Arial";
watermark.Width = 500;
watermark.Height = 100;
// Text will be directed from the bottom-left to the top-right corner.
watermark.Rotation = -40;
// Remove the following two lines if you need a solid black text.
watermark.Fill.Color = Color.Gray; // Try LightGray to get more Word-style watermark
watermark.StrokeColor = Color.Gray; // Try LightGray to get more Word-style watermark

// Place the watermark in the page center.
watermark.RelativeHorizontalPosition = RelativeHorizontalPosition.Page;
watermark.RelativeVerticalPosition = RelativeVerticalPosition.Page;
watermark.WrapType = WrapType.None;
watermark.VerticalAlignment = VerticalAlignment.Center;
watermark.HorizontalAlignment = HorizontalAlignment.Center;

// Create a new paragraph and append the watermark to this paragraph.
Paragraph watermarkPara = new Paragraph(doc);
watermarkPara.AppendChild(watermark);

// Insert the watermark into all headers of each document section.
foreach (Section sect in doc.Sections)
{
// There could be up to three different headers in each section, since we want
// the watermark to appear on all pages, insert into all headers.
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderPrimary);
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderFirst);
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderEven);
}
}

private static void InsertWatermarkIntoHeader(Paragraph watermarkPara, Section sect, HeaderFooterType headerType)
{
HeaderFooter header = sect.HeadersFooters[headerType];

if (header == null)
{
// There is no header of the specified type in the current section, create it.
header = new HeaderFooter(sect.Document, headerType);
sect.HeadersFooters.Add(header);
}

// Insert a clone of the watermark into the header.
header.AppendChild(watermarkPara.Clone(true));
}
}
}

Visual Basic
Imports Microsoft.VisualBasic
Imports System
Imports System.Drawing
Imports System.IO
Imports System.Reflection

Imports Aspose.Words
Imports Aspose.Words.Drawing
Imports Aspose.Words.Fields

Namespace AddWatermark
Public Class Program
Public Shared Sub Main(ByVal args() As String)
' Sample infrastructure.
Dim exeDir As String = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + Path.DirectorySeparatorChar
Dim dataDir As String = New Uri(New Uri(exeDir), "../../Data/").LocalPath

Dim doc As New Document(dataDir & "TestFile.doc")
InsertWatermarkText(doc, "CONFIDENTIAL")
doc.Save(dataDir & "TestFile Out.doc")
End Sub

''' <summary>
''' Inserts a watermark into a document.
''' </summary>
''' <param name="doc">The input document.</param>
''' <param name="watermarkText">Text of the watermark.</param>
Private Shared Sub InsertWatermarkText(ByVal doc As Document, ByVal watermarkText As String)
' Create a watermark shape. This will be a WordArt shape.
' You are free to try other shape types as watermarks.
Dim watermark As New Shape(doc, ShapeType.TextPlainText)

' Set up the text of the watermark.
watermark.TextPath.Text = watermarkText
watermark.TextPath.FontFamily = "Arial"
watermark.Width = 500
watermark.Height = 100
' Text will be directed from the bottom-left to the top-right corner.
watermark.Rotation = -40
' Remove the following two lines if you need a solid black text.
watermark.Fill.Color = Color.Gray ' Try LightGray to get more Word-style watermark
watermark.StrokeColor = Color.Gray ' Try LightGray to get more Word-style watermark

' Place the watermark in the page center.
watermark.RelativeHorizontalPosition = RelativeHorizontalPosition.Page
watermark.RelativeVerticalPosition = RelativeVerticalPosition.Page
watermark.WrapType = WrapType.None
watermark.VerticalAlignment = VerticalAlignment.Center
watermark.HorizontalAlignment = HorizontalAlignment.Center

' Create a new paragraph and append the watermark to this paragraph.
Dim watermarkPara As New Paragraph(doc)
watermarkPara.AppendChild(watermark)

' Insert the watermark into all headers of each document section.
For Each sect As Section In doc.Sections
' There could be up to three different headers in each section, since we want
' the watermark to appear on all pages, insert into all headers.
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderPrimary)
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderFirst)
InsertWatermarkIntoHeader(watermarkPara, sect, HeaderFooterType.HeaderEven)
Next sect
End Sub

Private Shared Sub InsertWatermarkIntoHeader(ByVal watermarkPara As Paragraph, ByVal sect As Section, ByVal headerType As HeaderFooterType)
Dim header As HeaderFooter = sect.HeadersFooters(headerType)

If header Is Nothing Then
' There is no header of the specified type in the current section, create it.
header = New HeaderFooter(sect.Document, headerType)
sect.HeadersFooters.Add(header)
End If

' Insert a clone of the watermark into the header.
header.AppendChild(watermarkPara.Clone(True))
End Sub
End Class
End Namespace

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