我有点困惑如何使用
HasMorePagesYPosition这是我的代码：
private float YPosition()
{
return this.TopMargin + ((float)this.LinesCount * this.Font.GetHeight(this.Graphics) + (float)this.ImagesHeight);
}
private void TicketPrintPage(object sender, PrintPageEventArgs e)
{
e.Graphics.PageUnit = GraphicsUnit.Millimeter;
this.Graphics = e.Graphics;
foreach (Tuple<Object, LineTypes> tuple in this.Objects)
{
switch (tuple.Item2)
{
case LineTypes.LINE:
this.Graphics.DrawString((String)tuple.Item1, this.Font, this.SolidBrush, this.LeftMargin, this.YPosition(), new StringFormat());
this.LinesCount++;
break;
case LineTypes.IMAGE:
Image Image = (Image)tuple.Item1;
// Center Image, using PaperSize
Graphics GraphicsImage = Graphics.FromImage(Image);
RectangleF RectangleF = e.MarginBounds;
RectangleF.Offset(-e.PageSettings.HardMarginX, -e.PageSettings.HardMarginY);
float InchX = RectangleF.X / 100f + (RectangleF.Width / 100f - (float)Image.Width / GraphicsImage.DpiX) / 2f;
Int32 MillimeterX = (Int32)Math.Ceiling(InchX / 0.039370);
this.Graphics.DrawImage(Image, new Point((int)this.LeftMargin + (MillimeterX / 2), (int)this.YPosition()));
double a = (double)Image.Height / 58.0 * 15.0;
this.ImagesHeight += (int)Math.Round(a) + 3;
break;
}
if ((YPosition() * 4) >= e.PageSettings.PrintableArea.Height)
{
e.HasMorePages = true;
return;
}
else
{
e.HasMorePages = false;
}
}
}
YPosition如何防止打印无限循环并在处理完所有对象后停止？
您需要使用 while 循环和Enumerator，而不是 for 循环。枚举器保留您正在处理的对象的状态，并将其作为成员存储在表单实例上。使用 PrintDocument 类的 BeginPrint 和 EndPrint 事件来初始化和清理枚举器。
// this is the variable that holds the enumerator instance
// once printing has started
IEnumerator<Tuple<Object, LineTypes>> ObjectsEnumerator;
// this is the event raised by printdocument at the start of printing
private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{
this.ObjectsEnumerator = Objects.GetEnumerator();
}
由于我们现在有一个枚举器，PrintPage 实现将使用它。它调用 MoveNext 并将结果存储在
HasMorePagesCurrentprivate void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
int linesCount = 0;
float yPosition = 10;
// take the next item from the list by calling MoveNext
// and assign the outcome to e.HasMorePages
while(e.HasMorePages = this.ObjectsEnumerator.MoveNext())
{
var tuple = this.ObjectsEnumerator.Current;
switch (tuple.Item2)
{
case LineTypes.LINE:
// draw magic
e.Graphics.DrawString(tuple.Item1.ToString(), font, solidBrush, new PointF(10,yPosition));
yPosition += 300;
linesCount++;
break;
case LineTypes.IMAGE:
Image Image = (Image)tuple.Item1;
// e.Graphics.DrawImage(....);
// calculate new yPosition
yPosition += Image.Height;
break;
}
// if we reach the end of the page
if (yPosition >= e.PageSettings.PrintableArea.Height)
{
//we break out of the while loop
// e.HasMorePages is already set
break;
}
}
}
使用此代码，您可以迭代您的集合，如果页面已满则跳出循环，并在没有更多项目可打印时停止迭代和打印。
如果打印完成，则调用 Endprint，其任务是清理枚举器。
private void printDocument1_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
{
if (this.ObjectsEnumerator != null)
{
this.ObjectsEnumerator.Dispose();
this.ObjectsEnumerator = null;
}
}
修复使用 HasMorePages 在 C# 中打印时的分页问题。 关于这段代码的解释：打印时可以添加很多行或者从数据库读取来查看分页的结果，比如我手动只在表中添加了两行，由于行数较少，所以没有分页。手动添加多行或将数据库中的信息插入到网格视图中。这是一个例子：
int currentPage = 1;
int rowsPerPage = 36; //Number of rows per page
int rowIndex = 0;
void pdoc_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
try
{
int x = 5, y = 5; //Drawing start position
int rowMargin = 0; //Spacing between lines
dgvHesaab.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
dgvHesaab.DefaultCellStyle.WrapMode = DataGridViewTriState.True;
dgvHesaab.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
dgvHesaab.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing; //Text with more lines in a row.
dgvHesaab.ColumnHeadersHeight = 40; //40=row height. Text with more lines in a row.
dgvHesaab.RightToLeft = RightToLeft.Yes;
int rowCount = dgvHesaab.Rows.Count; //Get the number of rows
int pageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(rowCount) / Convert.ToDouble(rowsPerPage)));
//Set header content of columns
for (int j = this.dgvHesaab.Columns.Count - 1; j >= 0; j--)
{
Rectangle rect = new Rectangle(x, y, 132, dgvHesaab.Rows[0].Height); //132 = width in row
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.Alignment = StringAlignment.Center;
e.Graphics.FillRectangle(Brushes.LightGray, rect);
e.Graphics.DrawRectangle(Pens.Black, rect);
if (this.dgvHesaab.Columns[j].HeaderText != null)
{
e.Graphics.DrawString(this.dgvHesaab.Columns[j].HeaderText, SystemFonts.DefaultFont, Brushes.Black, rect, sf);
}
x += rect.Width;
}
x = 5;
y += dgvHesaab.Rows[0].Height + rowMargin;
//Set the content of the lines
while (rowIndex < dgvHesaab.Rows.Count)
{
DataGridViewRow row = dgvHesaab.Rows[rowIndex];
if (row.Cells[0].Value != null)
{
for (int j = this.dgvHesaab.Columns.Count - 1; j >= 0; j--)
{
DataGridViewCell cell = row.Cells[j];
Rectangle rect = new Rectangle(x, y, 132, dgvHesaab.Rows[0].Height); //132 = width in row
StringFormat sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.Alignment = StringAlignment.Center;
e.Graphics.DrawRectangle(Pens.Black, rect);
if (cell.Value != null)
{
e.Graphics.DrawString(cell.Value.ToString(), new Font("Tahoma", 8, FontStyle.Bold), Brushes.Black, rect, sf);
}
x += rect.Width;
}
x = 5;
y += dgvHesaab.Rows[0].Height + rowMargin;
}
rowIndex++;
//Print a new page if necessary
if (rowIndex % rowsPerPage == 0 || rowIndex == dgvHesaab.Rows.Count)
{
e.HasMorePages = (currentPage < pageCount);
currentPage++;
return;
}
}
}
catch (Exception)
{
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
try
{
//Begin , Adding a row to the gridView(dgvHesaab)
///<summary>
///For example, the name of our Grid View is dgvHesaab
///Retrieving data from a database or manually inserting data for a row.
///</summary>
//add row 1
dgvHesaab.Rows.Add(new object[]
{
"Row 1 : Item 1",
"Row 1 : Item 2",
"Row 1 : Item 3",
"Row 1 : Item 4",
"Row 1 : Item 5",
"Row 1 : Item 6",
});
//add row 2
dgvHesaab.Rows.Add(new object[]
{
"Row 2 : Item 1",
"Row 2 : Item 2",
"Row 2 : Item 3",
"Row 2 : Item 4",
"Row 2 : Item 5",
"Row 2 : Item 6",
});
//End , Adding a row to the gridView(dgvHesaab)
dgvHesaab.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
dgvHesaab.DefaultCellStyle.WrapMode = DataGridViewTriState.True;
dgvHesaab.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
dgvHesaab.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.EnableResizing; //Text with more lines in a row.
dgvHesaab.ColumnHeadersHeight = 40; //40=row height. Text with more lines in a row.
dgvHesaab.RightToLeft = RightToLeft.Yes;
//Begin Print
PrintDialog pDialog = new PrintDialog();
pDialog.AllowCurrentPage = false;
pDialog.AllowPrintToFile = false;
pDialog.AllowSelection = false;
pDialog.AllowSomePages = false;
pDialog.PrintToFile = false;
pDialog.ShowHelp = false;
pDialog.ShowNetwork = false;
if (pDialog.ShowDialog() == DialogResult.OK)
{
System.Drawing.Printing.PrintDocument pdoc = new System.Drawing.Printing.PrintDocument();
pdoc.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(pdoc_PrintPage);
pdoc.DocumentName = "Print Title";
pdoc.PrinterSettings = pDialog.PrinterSettings;
pdoc.DefaultPageSettings = pDialog.PrinterSettings.DefaultPageSettings;
pdoc.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(100, 100, 100, 100);
pdoc.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize("A4", 827, 1169);
pdoc.DefaultPageSettings.Landscape = false; //Landscape
//pdoc.PrinterSettings.Copies = 3;
PrintPreviewDialog printPreviewDialog1 = new PrintPreviewDialog();
printPreviewDialog1.Document = pdoc;
pdoc.Print(); //No preview
//printPreviewDialog1.ShowDialog(); //printPreview
}
//End Print
}
catch (Exception)
{
}
}