PagedCollectionView的MoveToNextPage怎么用？

Question

这两天在体验PrintDocument , 试着打印DataGrid 。

PagedCollectionView pcv = brow.ItemsSource as PagedCollectionView;
pcv.MoveToFirstPage();

pcv.MoveToNextPage();

执行后界面并没有到第二页，请问MoveToNextPage怎么用？

哪儿能找到多页打印的例子？

 

Answer 1

 

找到了一点线索：应该先要设定每页行数 pcv.PageSize = 30;

问题是如何知道目前的可见行数呢？

Answer 2

你具体的需求是什么？为什么想知道可见行数？这个跟PageSize是没有关系的。你是不想滚动条出现吗？因为这个DataGrid.Height和DataGrid.Row.Height都是你可以控制的，所以其实你可以自己通过设定来调整。

Answer 3

为了打印DataGrid, 所以要翻页。

打印DataGrid有什么好的方法吗?

 

Answer 4

终于把它搞出来了，贴出来与大家分享，办法较土，请楼上指正，见笑了：

        public void _printDataGrid( ChildWindow form, DataGrid brow , int pagesizeMax )
        {
            System.Windows.Printing.PrintDocument docToPrint = new System.Windows.Printing.PrintDocument();
            PagedCollectionView pcv = brow.ItemsSource as PagedCollectionView;
            if (pcv == null)
            {
                MessageBox.Show("表格里无数据！");
                return;
            }

            // 保存原来状态
            Thickness a0 = form.Margin;
            double a1 = form.Height;
            double a2 = form.Width;
            Thickness c0 = brow.Margin;
            double c1 = brow.Height;
            double c2 = brow.Width;
            int c3 = pcv.PageSize;

            int pagesize;
            if (pagesizeMax <= 0)
                pagesize = 37;// 每页行数最大值缺省37
            else
                pagesize = pagesizeMax;
            int count = pcv.Count;  // 总记录数
            int pagen = 0;               // 共几页（当==0时表示还未计算）
            int pagen2 = 1;   
            docToPrint.PrintPage += (s, e) =>
            {
                 
                form.Height = e.PrintableArea.Height * 2;   

                form.Width = e.PrintableArea.Width;     
                brow.Margin = new Thickness(0, 0, 0, 0);

                if (pagen == 0)
                {
                    while (pagesize > 0)
                    {
                        pcv.PageSize = pagesize;
                        pcv.MoveToFirstPage();
                        brow.UpdateLayout();

                        if (brow.DesiredSize.Height < e.PrintableArea.Height)
                        {
                            pagen = (int)((count + pagesize - 1) / pagesize);
                            break;
                        }
                        pagesize--;
                    }
                }

                if (pagen2 < pagen)
                    e.HasMorePages = true;
                else
                    e.HasMorePages = false;
                e.PageVisual = brow;

                pcv.MoveToPage(pagen2 - 1);
                brow.UpdateLayout();
                pagen2++;
            };
            docToPrint.EndPrint += (s, e) =>
            {
                pcv.PageSize = c3;
                form.Margin = a0;
                form.Height = a1;
                form.Width = a2;
                brow.Margin = c0;
                brow.Height = c1;
                brow.Width = c2;
                brow.UpdateLayout();
            };
            docToPrint.Print("Sunpro Print");
        }