Word格式處理控件Aspose.Words for .NET水印處理教程——如何添加和刪除水印

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Aspose.Words For .NET是一種高級Word文檔處理API，用于執行各種文檔管理和操作任務。API支持生成，修改，轉換，呈現和打印文檔，而無需在跨平臺應用程序中直接使用Microsoft Word。此外，API支持所有流行的Word處理文件格式，并允許將Word文檔導出或轉換為固定布局文件格式和最常用的圖像/多媒體格式。

接下來我們將進入關于“水印處理”的介紹，在Aspose.Words中學會如何添加和刪除水印。

>>Aspose.Words for .NET已經更新至v20.2，新增6大新功能，包括支持動態復選框值設置，支持字段格式，支持導出bookmarkStart的w：colFirst和w：colLast屬性等，點擊下載體驗

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在文檔中添加水印

有時，如果想打印草稿文件或將其標記為機密文件，則需要在Word文檔中插入水印。在Microsoft Word中，可以使用“插入水印”命令快速插入水印。使用此命令的人很少意識到這種“水印”只是一種文本插入到頁眉或頁腳并位于頁面中心的形狀。

盡管在Aspose.Words中沒有像Microsoft Word中那樣的單個“插入水印”命令，但是很容易將任何形狀或圖像插入頁眉或頁腳中，從而創建任何可以想象的類型的水印。下面的示例在Word文檔中插入一個水印。

class AddWatermark
{
    public static void Run()
    {
        // The path to the documents directory.
        string dataDir = RunExamples.GetDataDir_WorkingWithImages();
        string fileName = "TestFile.Watermark.doc";
        Document doc = new Document(dataDir + fileName);
        InsertWatermarkText(doc, "CONFIDENTIAL");
        dataDir = dataDir + RunExamples.GetOutputFilePath(fileName);
        doc.Save(dataDir);

        Console.WriteLine("\nAdded watermark to the document successfully.\nFile saved at " + dataDir);
    }

    ////// Inserts a watermark into a document.
    //////The input document.///Text of the watermark.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);
        watermark.Name= "WaterMark";
        // 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));
    }
}

在表格單元格中添加水印

有時需要在表的單元格中插入水印/圖像并將其顯示在表外部，可以使用ShapeBase.IsLayoutInCell屬性。此屬性獲取或設置一個標志，該標志指示形狀是顯示在表內還是表外。請注意，僅當使用CompatibilityOptions.OptimizeFor方法為MS Word 2010優化文檔時，此屬性才起作用。下面的代碼示例演示如何使用此屬性。

Document doc = new Document(dataDir + @"LayoutInCell.docx");
DocumentBuilder builder = new DocumentBuilder(doc);

Shape watermark = new Shape(doc, ShapeType.TextPlainText);
watermark.RelativeHorizontalPosition = RelativeHorizontalPosition.Page;
watermark.RelativeVerticalPosition = RelativeVerticalPosition.Page;
watermark.IsLayoutInCell = true; // Display the shape outside of table cell if it will be placed into a cell.

watermark.Width = 300;
watermark.Height = 70;
watermark.HorizontalAlignment = HorizontalAlignment.Center;
watermark.VerticalAlignment = VerticalAlignment.Center;

watermark.Rotation = -40;
watermark.Fill.Color = Color.Gray;
watermark.StrokeColor = Color.Gray;

watermark.TextPath.Text = "watermarkText";
watermark.TextPath.FontFamily = "Arial";

watermark.Name = string.Format("WaterMark_{0}", Guid.NewGuid());
watermark.WrapType = WrapType.None;

Run run = doc.GetChildNodes(NodeType.Run, true)[doc.GetChildNodes(NodeType.Run, true).Count - 1] as Run;

builder.MoveTo(run);
builder.InsertNode(watermark);
doc.CompatibilityOptions.OptimizeFor(MsWordVersion.Word2010);
 
dataDir = dataDir + "Shape_IsLayoutInCell_out.docx";

// Save the document to disk.
doc.Save(dataDir);

從文檔中刪除水印

要從文檔中刪除水印，您只需在插入過程中設置水印形狀的名稱，然后通過分配的名稱刪除水印形狀。以下代碼段向您展示了如何設置水印形狀的名稱以及如何從文檔中刪除。

// For complete examples and data files, please go to //github.com/aspose-words/Aspose.Words-for-.NET
public static void Run()
{          
    // The path to the documents directory.
    string dataDir = RunExamples.GetDataDir_WorkingWithImages();
    string fileName = "RemoveWatermark.docx";
    Document doc = new Document(dataDir + fileName);
    RemoveWatermarkText(doc);
    dataDir = dataDir + RunExamples.GetOutputFilePath(fileName);
    doc.Save(dataDir);
}

private static void RemoveWatermarkText(Document doc)
{
    foreach (HeaderFooter hf in doc.GetChildNodes(NodeType.HeaderFooter, true))
    {
        foreach (Shape shape in hf.GetChildNodes(NodeType.Shape, true))
        {
            if (shape.Name.Contains("WaterMark"))
            {
                shape.Remove();
            }
        }
    }
}
    }

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