为什么这个流程文件表总是打印 2 列 [英] Why is this flowdocument table always printing 2 columns

问题描述

我的 WPF 应用程序中有一个 ListView，它绑定到一组要执行的任务(待办事项列表).我希望用户能够打印他们的列表，并根据 MSDN 指南创建了以下代码.(这是我第一次涉足印刷业)

I have a ListView in my WPF app that is bound to a collection of tasks to perform (A to-do list). I want the user to be able to print their list and have created the following code based on the MSDN guidelines. (This my first foray into printing)

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打印时，我总是将页面从中间分成 2 列(每列包含表格的 3 列).我尝试了不同的 GridLength 值，但没有成功.

When I try to print with the following code I always have my page split down the middle with 2 columns (Each containing the 3 columns of the table). I have tried different GridLength values but had no success.

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

推荐答案

我想得到答案的最好方法是放弃并询问，然后你自己找到.

I guess the best way to get an answer is to give up and ask, then you find it yourself.

问题在于打印页面，而不是流程文档本身.默认情况下，它们打印 2 列.更正后的代码是(这也涉及边距和可打印区域):

The issue was in the line to print the pages, not the flowdoc itself. By default they print with 2 columns. The corrected code is (this also deals with the margin and printable area):

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");

}

顺便说一下，我在 Matthew MacDonald 的Pro WPF in C# 2008"中发现了这个，我强烈推荐.

By the way I found this in Matthew MacDonald's "Pro WPF in C# 2008" which I highly recommend.

这篇关于为什么这个流程文件表总是打印 2 列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！