为什么此flowdocument表始终打印2列

Question

我的WPF应用程序中有一个ListView,它绑定到要执行的任务集合(待办事项列表).我希望用户能够打印他们的列表,并根据MSDN指南创建以下代码.(这是我第一次涉足印刷业)

public FlowDocument GetPrintDocument()
{
    FlowDocument flowDoc = new FlowDocument();
    Table table = new Table();

    int numColumns = 3;

    flowDoc.Blocks.Add(table);

    for(int x=0;x<numColumns;x++)
    {
        table.Columns.Add(new TableColumn());
    }
    GridLengthConverter glc = new GridLengthConverter();
    table.Columns[0].Width = (GridLength)glc.ConvertFromString("300");
    table.Columns[1].Width = (GridLength)glc.ConvertFromString("50");
    table.Columns[2].Width = (GridLength)glc.ConvertFromString("50");

    table.RowGroups.Add(new TableRowGroup());

    table.RowGroups[0].Rows.Add(new TableRow());
    // store current working row for reference
    TableRow currentRow = table.RowGroups[0].Rows[0];

    currentRow.FontSize = 16;
    currentRow.FontWeight = FontWeights.Bold;

    currentRow.Cells.Add(new TableCell(new Paragraph(new Run("Subject"))));
    currentRow.Cells.Add(new TableCell(new Paragraph(new Run("Due Date"))));
    currentRow.Cells.Add(new TableCell(new Paragraph(new Run("Urgency"))));

    for (int i = 1; i < issues.Count+1; i++)
    {
        table.RowGroups[0].Rows.Add(new TableRow());
        currentRow = table.RowGroups[0].Rows[i];
        currentRow.FontSize = 12;
        currentRow.FontWeight = FontWeights.Normal;

        currentRow.Cells.Add(new TableCell
                            (new Paragraph
                            (new Run
                            (issues[i - 1].IssSubject))));
        currentRow.Cells.Add(new TableCell
                            (new Paragraph
                            (new Run
                            (issues[i - 1].IssDueDate.Date.ToString()))));
        currentRow.Cells.Add(new TableCell
                            (new Paragraph
                            (new Run
                            (issues[i - 1].IssUrgency.ToString()))));
    }
    return flowDoc;
} 

当我尝试使用以下代码进行打印时,我总是将页面拆分为中间的2列(每列包含表格的3列).我尝试过不同的GridLength值但没有成功.

printDialog.PrintDocument(((IDocumentPaginatorSource)StatusBoardViewModel
               .GetPrintDocument())
               .DocumentPaginator 
            ,"Flow Document Print Job");

Answer 1

我想获得答案的最佳方式是放弃并提出问题,然后你自己找到答案.

问题在于打印页面,而不是flowdoc本身.默认情况下,它们打印2列.更正的代码是(这也处理边距和可打印区域):

PrintDialog printDialog = new PrintDialog();

if (printDialog.ShowDialog() == true)
{

    FlowDocument flowDoc = statusBoardViewModel.GetPrintDocument();

    flowDoc.PageHeight = printDialog.PrintableAreaHeight;
    flowDoc.PageWidth = printDialog.PrintableAreaWidth;
    flowDoc.PagePadding = new Thickness(25);

    flowDoc.ColumnGap = 0;

    flowDoc.ColumnWidth = (flowDoc.PageWidth - 
                           flowDoc.ColumnGap - 
                           flowDoc.PagePadding.Left -  
                           flowDoc.PagePadding.Right);

    printDialog.PrintDocument(((IDocumentPaginatorSource)flowDoc)
                             .DocumentPaginator,
                             "Task Manager Print Job");

}

顺便说一句,我在Matthew MacDonald的"C#2008中的Pro WPF"中发现了这一点,我强烈推荐.