示例

以下是一个简单的示例，演示如何在Winform中实现打印模板设计并分页：

1.设计打印模板

在窗体中添加一个Panel控件，并设置其大小和位置，用于容纳需要打印的内容。

2.设置打印预览

在窗体中添加一个PrintPreviewDialog控件，并设置其大小和位置。在窗体的Load事件中，将PrintDocument对象关联到PrintPreviewDialog控件：

private void Form1_Load(object sender, EventArgs e)
{
    printDocument1.DocumentName = "打印模板";
    printPreviewDialog1.Document = printDocument1;
}

3.设置打印分页

在PrintDocument的PrintPage事件中，根据需要打印的内容进行分页：

private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
    // 获取打印页面的边距
    int marginLeft = e.MarginBounds.Left;
    int marginTop = e.MarginBounds.Top;
    int marginRight = e.MarginBounds.Right;
    int marginBottom = e.MarginBounds.Bottom;

    // 设置打印内容的位置和大小
    panel1.Location = new Point(marginLeft, marginTop);
    panel1.Size = new Size(e.MarginBounds.Width, e.MarginBounds.Height);

    // 计算需要打印的页数
    int pageCount = (int)Math.Ceiling((double)panel1.Height / e.MarginBounds.Height);

    // 分页打印
    for (int i = 0; i < pageCount; i++)
    {
        // 计算当前页需要打印的区域
        int top = i * e.MarginBounds.Height;
        Rectangle rect = new Rectangle(marginLeft, marginTop - top, e.MarginBounds.Width, e.MarginBounds.Height);

        // 打印当前页
        e.Graphics.DrawRectangle(Pens.Black, rect);
        panel1.DrawToBitmap(bitmap, rect);
        e.Graphics.DrawImage(bitmap, rect);
    }

    // 如果还有下一页，则设置HasMorePages属性为true
    if (currentPage < pageCount)
    {
        currentPage++;
        e.HasMorePages = true;
    }
    else
    {
        currentPage = 1;
        e.HasMorePages = false;
    }
}

4.打印

在打印按钮的Click事件中，使用PrintDialog控件选择打印机后，将PrintDocument对象关联到PrintDialog控件，并调用Print方法进行打印：

private void btnPrint_Click(object sender, EventArgs e)
{
    PrintDialog printDialog = new PrintDialog();
    printDialog.Document = printDocument1;
    if (printDialog.ShowDialog() == DialogResult.OK)
    {
        printDocument1.Print();
    }
}

完整代码如下：

public partial class Form1 : Form
{
    private int currentPage = 1;
    private Bitmap bitmap;

    public Form1()
    {
        InitializeComponent();
        bitmap = new Bitmap(panel1.Width, panel1.Height);
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        printDocument1.DocumentName = "打印模板";
        printPreviewDialog1.Document = printDocument1;
    }

    private void btnPreview_Click(object sender, EventArgs e)
    {
        printPreviewDialog1.ShowDialog();
    }

    private void btnPrint_Click(object sender, EventArgs e)
    {
        PrintDialog printDialog = new PrintDialog();
        printDialog.Document = printDocument1;
        if (printDialog.ShowDialog() == DialogResult.OK)
        {
            printDocument1.Print();
        }
    }

    private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        // 获取打印页面的边距
        int marginLeft = e.MarginBounds.Left;
        int marginTop = e.MarginBounds.Top;
        int marginRight = e.MarginBounds.Right;
        int marginBottom = e.MarginBounds.Bottom;

        // 设置打印内容的位置和大小
        panel1.Location = new Point(marginLeft, marginTop);
        panel1.Size = new Size(e.MarginBounds.Width, e.MarginBounds.Height);

        // 计算需要打印的页数
        int pageCount = (int)Math.Ceiling((double)panel1.Height / e.MarginBounds.Height);

        // 分页打印
        for (int i = 0; i < pageCount; i++)
        {
            // 计算当前页需要打印的区域
            int top = i * e.MarginBounds.Height;
            Rectangle rect = new Rectangle(marginLeft, marginTop - top, e.MarginBounds.Width, e.MarginBounds.Height);

            // 打印当前页
            e.Graphics.DrawRectangle(Pens.Black, rect);
            panel1.DrawToBitmap(bitmap, rect);
            e.Graphics.DrawImage(bitmap, rect);
        }

        // 如果还有下一页，则设置HasMorePages属性为true
        if (currentPage < pageCount)
        {
            currentPage++;
            e.HasMorePages = true;
        }
        else
        {
            currentPage = 1;
            e.HasMorePages = false;
        }
    }
}