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(zhí)行各種文檔管理和操作任務(wù)。API支持生成，修改，轉(zhuǎn)換，呈現(xiàn)和打印文檔，而無需在跨平臺應(yīng)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(dǎo)出或轉(zhuǎn)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(jìn)入關(guān)于“水印處理”的介紹，在Aspose.Words中學(xué)會如何添加和刪除水印。

>>Aspose.Words for .NET已經(jīng)更新至v20.2，新增6大新功能，包括支持動態(tài)復(fù)選框值設(shè)置，支持字段格式，支持導(dǎo)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?qū)⑵錁?biāo)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(chuàng)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(shè)置一個標(biāo)志，該標(biāo)志指示形狀是顯示在表內(nèi)還是表外。請注意，僅當(dāng)使用CompatibilityOptions.OptimizeFor方法為MS Word 2010優(yōu)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(shè)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(shè)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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