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PDF管理控件Aspose.PDF for .Net使用教程（四十一）：在带标签的PDF中使用表格

Aspose.PDF for .NET是一种高PDF处理和解析API，用于在跨平台应用程序中执行文档管理和操作任务。API可以轻松用于生成、修改、转换、渲染、保护和打印PDF文档，而无需使用Adobe Acrobat。此外，API还提供PDF压缩选项，表格创建和操作，图形和图像功能，广泛的超链接功能，印章和水印任务，扩展的安全控制和自定义字体处理。

在接下来的系列教程中，将为开发者带来Aspose.PDF for .NET的一系列使用教程，例如进行文档间的转换，如何标记PDF文件，如何使用表单和图表等等。本文将介绍如何在带标签的PDF中使用表格。包括：

  • 在带标签的PDF中创建表格
  • 样式表元素
  • 样式表行
  • 样式表单元

>>Aspose.PDF for .NET更新至最新版v20.7，欢迎下载体验。

在带标签的PDF中创建表格

用于.NET的Aspose.PDF允许在带标签的PDF文档中创建表格。为了处理表，API提供了TableElement类。为了创建表，可以使用ITaggedContent接口的CreateTableElement（）方法。此外，可以使用 TableElement类的CreateTHead（），CreateTBody（）和CreateTFoot（）方法分别创建Table Head，Table Body和Table Foot。若要创建表行，可以使用TableRowCollectionElement的 CreateTR（）方法 类。您还可以使用Document类的Validate（）方法检查创建的PDF文档是否符合PDF / UA。以下代码段显示了如何在“带标签的PDF”文档中创建表格： 

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

// Create document
Document document = new Document();
ITaggedContent taggedContent = document.TaggedContent;

taggedContent.SetTitle("Example table");
taggedContent.SetLanguage("en-US");

// Get root structure element
StructureElement rootElement = taggedContent.RootElement;


TableElement tableElement = taggedContent.CreateTableElement();
rootElement.AppendChild(tableElement);

tableElement.Border = new BorderInfo(BorderSide.All, 1.2F, Color.DarkBlue);

TableTHeadElement tableTHeadElement = tableElement.CreateTHead();
TableTBodyElement tableTBodyElement = tableElement.CreateTBody();
TableTFootElement tableTFootElement = tableElement.CreateTFoot();
int rowCount = 50;
int colCount = 4;
int rowIndex;
int colIndex;

TableTRElement headTrElement = tableTHeadElement.CreateTR();
headTrElement.AlternativeText = "Head Row";

headTrElement.BackgroundColor = Color.LightGray;

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTHElement thElement = headTrElement.CreateTH();
    thElement.SetText(String.Format("Head {0}", colIndex));

    thElement.BackgroundColor = Color.GreenYellow;
    thElement.Border = new BorderInfo(BorderSide.All, 4.0F, Color.Gray);

    thElement.IsNoBorder = true;
    thElement.Margin = new MarginInfo(16.0, 2.0, 8.0, 2.0);

    thElement.Alignment = HorizontalAlignment.Right;
}

for (rowIndex = 0; rowIndex < rowCount; rowIndex++)
{
    TableTRElement trElement = tableTBodyElement.CreateTR();
    trElement.AlternativeText = String.Format("Row {0}", rowIndex);

    for (colIndex = 0; colIndex < colCount; colIndex++)
    {
        int colSpan = 1;
        int rowSpan = 1;

        if (colIndex == 1 && rowIndex == 1)
        {
            colSpan = 2;
            rowSpan = 2;
        }
        else if (colIndex == 2 && (rowIndex == 1 || rowIndex == 2))
        {
            continue;
        }
        else if (rowIndex == 2 && (colIndex == 1 || colIndex == 2))
        {
            continue;
        }

        TableTDElement tdElement = trElement.CreateTD();
        tdElement.SetText(String.Format("Cell [{0}, {1}]", rowIndex, colIndex));


        tdElement.BackgroundColor = Color.Yellow;
        tdElement.Border = new BorderInfo(BorderSide.All, 4.0F, Color.Gray);

        tdElement.IsNoBorder = false;
        tdElement.Margin = new MarginInfo(8.0, 2.0, 8.0, 2.0);

        tdElement.Alignment = HorizontalAlignment.Center;

        TextState cellTextState = new TextState();
        cellTextState.ForegroundColor = Color.DarkBlue;
        cellTextState.FontSize = 7.5F;
        cellTextState.FontStyle = FontStyles.Bold;
        cellTextState.Font = FontRepository.FindFont("Arial");
        tdElement.DefaultCellTextState = cellTextState;

        tdElement.IsWordWrapped = true;
        tdElement.VerticalAlignment = VerticalAlignment.Center;

        tdElement.ColSpan = colSpan;
        tdElement.RowSpan = rowSpan;
    }
}

TableTRElement footTrElement = tableTFootElement.CreateTR();
footTrElement.AlternativeText = "Foot Row";

footTrElement.BackgroundColor = Color.LightSeaGreen;

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTDElement tdElement = footTrElement.CreateTD();
    tdElement.SetText(String.Format("Foot {0}", colIndex));

    tdElement.Alignment = HorizontalAlignment.Center;
    tdElement.StructureTextState.FontSize = 7F;
    tdElement.StructureTextState.FontStyle = FontStyles.Bold;
}


StructureAttributes tableAttributes = tableElement.Attributes.GetAttributes(AttributeOwnerStandard.Table);
StructureAttribute summaryAttribute = new StructureAttribute(AttributeKey.Summary);
summaryAttribute.SetStringValue("The summary text for table");
tableAttributes.SetAttribute(summaryAttribute);


// Save Tagged Pdf Document
document.Save(dataDir + "CreateTableElement.pdf");

// Checking PDF/UA compliance
document = new Document(dataDir + "CreateTableElement.pdf");
bool isPdfUaCompliance = document.Validate(dataDir + "table.xml", PdfFormat.PDF_UA_1);
Console.WriteLine(String.Format("PDF/UA compliance: {0}", isPdfUaCompliance));

样式表元素

用于.NET的Aspose.PDF允许样式化Tagged PDF文档中的表格。为了给表设置样式，可以使用ITaggedContent 接口的CreateTableElement（） 方法 创建表， 并使用TableElement 类的属性设置样式表。以下是可用于设置表格样式的列表属性：

  • BackgroundColor
  • Border
  • Alignment
  • CornerStyle
  • Broken
  • ColumnAdjustment
  • ColumnWidths
  • DefaultCellBorder
  • DefaultCellPadding
  • DefaultCellTextState
  • DefaultColumnWidth
  • IsBroken
  • IsBordersIncluded
  • Left
  • Top

以下代码段显示了如何在“带标签的PDF”文档中设置表格样式： 

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
// Create document
Document document = new Document();
ITaggedContent taggedContent = document.TaggedContent;

taggedContent.SetTitle("Example table style");
taggedContent.SetLanguage("en-US");

// Get root structure element
StructureElement rootElement = taggedContent.RootElement;


// Create table structure element
TableElement tableElement = taggedContent.CreateTableElement();
rootElement.AppendChild(tableElement);


tableElement.BackgroundColor = Color.Beige;
tableElement.Border = new BorderInfo(BorderSide.All, 0.80F, Color.Gray);
tableElement.Alignment = HorizontalAlignment.Center;
tableElement.Broken = TableBroken.Vertical;
tableElement.ColumnAdjustment = ColumnAdjustment.AutoFitToWindow;
tableElement.ColumnWidths = "80 80 80 80 80";
tableElement.DefaultCellBorder = new BorderInfo(BorderSide.All, 0.50F, Color.DarkBlue);
tableElement.DefaultCellPadding = new MarginInfo(16.0, 2.0, 8.0, 2.0);
tableElement.DefaultCellTextState.ForegroundColor = Color.DarkCyan;
tableElement.DefaultCellTextState.FontSize = 8F;
tableElement.DefaultColumnWidth = "70";

tableElement.IsBroken = false;
tableElement.IsBordersIncluded = true;

tableElement.Left = 0F;
tableElement.Top = 40F;

tableElement.RepeatingColumnsCount = 2;
tableElement.RepeatingRowsCount = 3;
TextState rowStyle = new TextState();
rowStyle.BackgroundColor = Color.LightCoral;
tableElement.RepeatingRowsStyle = rowStyle;




TableTHeadElement tableTHeadElement = tableElement.CreateTHead();
TableTBodyElement tableTBodyElement = tableElement.CreateTBody();
TableTFootElement tableTFootElement = tableElement.CreateTFoot();
int rowCount = 10;
int colCount = 5;
int rowIndex;
int colIndex;

TableTRElement headTrElement = tableTHeadElement.CreateTR();
headTrElement.AlternativeText = "Head Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTHElement thElement = headTrElement.CreateTH();
    thElement.SetText(String.Format("Head {0}", colIndex));
}

for (rowIndex = 0; rowIndex < rowCount; rowIndex++)
{
    TableTRElement trElement = tableTBodyElement.CreateTR();
    trElement.AlternativeText = String.Format("Row {0}", rowIndex);

    for (colIndex = 0; colIndex < colCount; colIndex++)
    {
        TableTDElement tdElement = trElement.CreateTD();
        tdElement.SetText(String.Format("Cell [{0}, {1}]", rowIndex, colIndex));
    }
}

TableTRElement footTrElement = tableTFootElement.CreateTR();
footTrElement.AlternativeText = "Foot Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTDElement tdElement = footTrElement.CreateTD();
    tdElement.SetText(String.Format("Foot {0}", colIndex));
}

// Save Tagged Pdf Document
document.Save(dataDir + "StyleTableElement.pdf");

            

// Checking PDF/UA compliance
document = new Document(dataDir + "StyleTableElement.pdf");
bool isPdfUaCompliance = document.Validate(dataDir + "StyleTableElement.xml", PdfFormat.PDF_UA_1);
Console.WriteLine(String.Format("PDF/UA compliance: {0}", isPdfUaCompliance));

样式表行

用于.NET的Aspose.PDF允许在标记的PDF文档中设置表格行的样式。为了设置表格行的样式，可以使用TableTRElement 类的属性。以下是可用于设置表格行样式的列表属性：

  • BackgroundColor
  • Border
  • DefaultCellBorder
  • MinRowHeight
  • FixedRowHeight
  • IsInNewPage
  • IsRowBroken
  • DefaultCellTextState
  • DefaultCellPadding
  • VerticalAlignment

以下代码段显示了如何在“标记的PDF”文档中设置表格行的样式： 

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
// Create document
Document document = new Document();
ITaggedContent taggedContent = document.TaggedContent;

taggedContent.SetTitle("Example table row style");
taggedContent.SetLanguage("en-US");

// Get root structure element
StructureElement rootElement = taggedContent.RootElement;


// Create table structure element
TableElement tableElement = taggedContent.CreateTableElement();
rootElement.AppendChild(tableElement);


TableTHeadElement tableTHeadElement = tableElement.CreateTHead();
TableTBodyElement tableTBodyElement = tableElement.CreateTBody();
TableTFootElement tableTFootElement = tableElement.CreateTFoot();
int rowCount = 7;
int colCount = 3;
int rowIndex;
int colIndex;

TableTRElement headTrElement = tableTHeadElement.CreateTR();
headTrElement.AlternativeText = "Head Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTHElement thElement = headTrElement.CreateTH();
    thElement.SetText(String.Format("Head {0}", colIndex));
}

for (rowIndex = 0; rowIndex < rowCount; rowIndex++)
{
    TableTRElement trElement = tableTBodyElement.CreateTR();
    trElement.AlternativeText = String.Format("Row {0}", rowIndex);

    trElement.BackgroundColor = Color.LightGoldenrodYellow;
    trElement.Border = new BorderInfo(BorderSide.All, 0.75F, Color.DarkGray);

    trElement.DefaultCellBorder = new BorderInfo(BorderSide.All, 0.50F, Color.Blue);
    trElement.MinRowHeight = 100.0;
    trElement.FixedRowHeight = 120.0;
    trElement.IsInNewPage = (rowIndex % 3 == 1);
    trElement.IsRowBroken = true;

    TextState cellTextState = new TextState();
    cellTextState.ForegroundColor = Color.Red;
    trElement.DefaultCellTextState = cellTextState;

    trElement.DefaultCellPadding = new MarginInfo(16.0, 2.0, 8.0, 2.0);
    trElement.VerticalAlignment = VerticalAlignment.Bottom;

    for (colIndex = 0; colIndex < colCount; colIndex++)
    {
        TableTDElement tdElement = trElement.CreateTD();
        tdElement.SetText(String.Format("Cell [{0}, {1}]", rowIndex, colIndex));
    }
}

TableTRElement footTrElement = tableTFootElement.CreateTR();
footTrElement.AlternativeText = "Foot Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTDElement tdElement = footTrElement.CreateTD();
    tdElement.SetText(String.Format("Foot {0}", colIndex));
}



// Save Tagged Pdf Document
document.Save(dataDir + "StyleTableRow.pdf");

// Checking PDF/UA compliance
document = new Document(dataDir + "StyleTableRow.pdf");
bool isPdfUaCompliance = document.Validate(dataDir + "StyleTableRow.xml", PdfFormat.PDF_UA_1);
Console.WriteLine(String.Format("PDF/UA compliance: {0}", isPdfUaCompliance));

样式表单元

用于.NET的Aspose.PDF允许样式化Tagged PDF文档中的表格单元格。为了设置表格单元格的样式，可以使用TableCellElement类的属性。以下是可用于设置表格单元格样式的列表属性：

  • BackgroundColor
  • Border
  • IsNoBorder
  • Margin
  • Alignment
  • DefaultCellTextState
  • IsWordWrapped
  • VerticalAlignment
  • ColSpan
  • RowSpan

以下代码段显示了如何在“标记的PDF”文档中设置表格单元的样式： 

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
// Create document
Document document = new Document();
ITaggedContent taggedContent = document.TaggedContent;

taggedContent.SetTitle("Example table cell style");
taggedContent.SetLanguage("en-US");

// Get root structure element
StructureElement rootElement = taggedContent.RootElement;


// Create table structure element
TableElement tableElement = taggedContent.CreateTableElement();
rootElement.AppendChild(tableElement);


TableTHeadElement tableTHeadElement = tableElement.CreateTHead();
TableTBodyElement tableTBodyElement = tableElement.CreateTBody();
TableTFootElement tableTFootElement = tableElement.CreateTFoot();
int rowCount = 4;
int colCount = 4;
int rowIndex;
int colIndex;

TableTRElement headTrElement = tableTHeadElement.CreateTR();
headTrElement.AlternativeText = "Head Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTHElement thElement = headTrElement.CreateTH();
    thElement.SetText(String.Format("Head {0}", colIndex));

    thElement.BackgroundColor = Color.GreenYellow;
    thElement.Border = new BorderInfo(BorderSide.All, 4.0F, Color.Gray);

    thElement.IsNoBorder = true;
    thElement.Margin = new MarginInfo(16.0, 2.0, 8.0, 2.0);

    thElement.Alignment = HorizontalAlignment.Right;
}

for (rowIndex = 0; rowIndex < rowCount; rowIndex++)
{
    TableTRElement trElement = tableTBodyElement.CreateTR();
    trElement.AlternativeText = String.Format("Row {0}", rowIndex);

    for (colIndex = 0; colIndex < colCount; colIndex++)
    {
        int colSpan = 1;
        int rowSpan = 1;

        if (colIndex == 1 && rowIndex == 1)
        {
            colSpan = 2;
            rowSpan = 2;
        }
        else if (colIndex == 2 && (rowIndex == 1 || rowIndex == 2))
        {
            continue;
        }
        else if (rowIndex == 2 && (colIndex == 1 || colIndex == 2))
        {
            continue;
        }

        TableTDElement tdElement = trElement.CreateTD();
        tdElement.SetText(String.Format("Cell [{0}, {1}]", rowIndex, colIndex));


        tdElement.BackgroundColor = Color.Yellow;
        tdElement.Border = new BorderInfo(BorderSide.All, 4.0F, Color.Gray);

        tdElement.IsNoBorder = false;
        tdElement.Margin = new MarginInfo(8.0, 2.0, 8.0, 2.0);

        tdElement.Alignment = HorizontalAlignment.Center;

        TextState cellTextState = new TextState();
        cellTextState.ForegroundColor = Color.DarkBlue;
        cellTextState.FontSize = 7.5F;
        cellTextState.FontStyle = FontStyles.Bold;
        cellTextState.Font = FontRepository.FindFont("Arial");
        tdElement.DefaultCellTextState = cellTextState;

        tdElement.IsWordWrapped = true;
        tdElement.VerticalAlignment = VerticalAlignment.Center;

        tdElement.ColSpan = colSpan;
        tdElement.RowSpan = rowSpan;
    }
}

TableTRElement footTrElement = tableTFootElement.CreateTR();
footTrElement.AlternativeText = "Foot Row";

for (colIndex = 0; colIndex < colCount; colIndex++)
{
    TableTDElement tdElement = footTrElement.CreateTD();
    tdElement.SetText(String.Format("Foot {0}", colIndex));
}


// Save Tagged Pdf Document
document.Save(dataDir + "StyleTableCell.pdf");

// Checking PDF/UA compliance
document = new Document(dataDir + "StyleTableCell.pdf");
bool isPdfUaCompliance = document.Validate(dataDir + "StyleTableCell.xml", PdfFormat.PDF_UA_1);
Console.WriteLine(String.Format("PDF/UA compliance: {0}", isPdfUaCompliance));
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