在C＃中显示打印预览

Question

目前，我正在尝试在PrintDocument上构建我的表单，但我能看到东西实际出现在页面上的唯一方法是打印纸张。它有效，但我有很多东西需要添加，而我不想浪费大量纸张。目前我有一个打印对话框出现，但没有打印预览按钮。有没有办法让它出现？谢谢！

public partial class Form4 : System.Windows.Forms.Form
    {
        private System.ComponentModel.Container components;
        private System.Windows.Forms.Button printButton;

        public Form4()
        {
            // The Windows Forms Designer requires the following call.
            InitializeComponent();
        }

        // The Click event is raised when the user clicks the Print button. 
        private void printButton_Click(object sender, EventArgs e)
        {
            PrintDocument pd = new PrintDocument();
            pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage);
            PrintDialog pdi = new PrintDialog();
            pdi.Document = pd;
            if (pdi.ShowDialog() == DialogResult.OK)
            {
                pd.Print();
            }

        }

        // The PrintPage event is raised for each page to be printed. 
        private void pd_PrintPage(object sender, PrintPageEventArgs e)
        {
            Single yPos = 0;
            Single leftMargin = e.MarginBounds.Left;
            Single topMargin = e.MarginBounds.Top;
            Image img = Image.FromFile("logo.bmp");
            Rectangle logo = new Rectangle(40, 40, 50, 50);
            using (Font printFont = new Font("Arial", 20.0f))
            {
                e.Graphics.DrawImage(img, logo);
                e.Graphics.DrawString("Header", printFont, Brushes.Black, leftMargin, yPos, new StringFormat());
            }
            using (SolidBrush blueBrush = new SolidBrush(Color.Black))
            {
                Rectangle rect = new Rectangle(100, 100, 500, 120);
                e.Graphics.FillRectangle(blueBrush, rect);
            }
        }


        // The Windows Forms Designer requires the following procedure. 
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.printButton = new System.Windows.Forms.Button();

            this.ClientSize = new System.Drawing.Size(504, 381);
            this.Text = "Print Example";

            printButton.ImageAlign =
               System.Drawing.ContentAlignment.MiddleLeft;
            printButton.Location = new System.Drawing.Point(32, 110);
            printButton.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            printButton.TabIndex = 0;
            printButton.Text = "Print the file.";
            printButton.Size = new System.Drawing.Size(136, 40);
            printButton.Click += new System.EventHandler(printButton_Click);

            this.Controls.Add(printButton);
        }

    }

- Nathan

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我相信你正在使用Windows Forms，所以请确保在问题中标记winforms标签。您可以使用PrintPreviewControl来实现此目的。 - Trevor Elliott

如果想在打印之前有一个单独的预览按钮，请查看此如何触发PrintPreviewDialog。您可能希望忽略文件流方面的内容。这对我很有帮助，我希望它也能帮助其他人。 - saheedmyself

Answer 1

您可以使用 PrintPreviewDialog 来实现此功能：

private void printButton_Click(object sender, EventArgs e)
{
    PrintDocument pd = new PrintDocument();
    pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage);

    PrintDialog printdlg = new PrintDialog();
    PrintPreviewDialog printPrvDlg = new PrintPreviewDialog();

    // preview the assigned document or you can create a different previewButton for it
    printPrvDlg.Document = pd;
    printPrvDlg.ShowDialog(); // this shows the preview and then show the Printer Dlg below

    printdlg.Document = pd;

    if (printdlg.ShowDialog() == DialogResult.OK)
    {
        pd.Print();
    }
}

- LarsTech

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注意：PrintPreviewDialog 是 System.Windows.Forms 命名空间的一部分。 - Jeff