c#打印一个windows窗体应用程序

Question

我找到了要打印的代码

// The PrintDialog will print the document
// by handling the document's PrintPage event.
private void document_PrintPage(object sender, 
System.Drawing.Printing.PrintPageEventArgs e)
{

    // Insert code to render the page here.
    // This code will be called when the control is drawn.

    // The following code will render a simple
    // message on the printed document.
    string text = "In document_PrintPage method.";
    System.Drawing.Font printFont = new System.Drawing.Font
        ("Arial", 35, System.Drawing.FontStyle.Regular);

    // Draw the content.
    e.Graphics.DrawString(text, printFont, 
        System.Drawing.Brushes.Black, 10, 10);
}


// Declare the PrintDocument object.
private System.Drawing.Printing.PrintDocument docToPrint =
    new System.Drawing.Printing.PrintDocument();

private void printButton_Click(object sender, EventArgs e)
{

    PrintDialog PrintDialog1 = new PrintDialog();
    // Allow the user to choose the page range he or she would
    // like to print.
    PrintDialog1.AllowSomePages = true;

    // Show the help button.
    PrintDialog1.ShowHelp = true;

    // Set the Document property to the PrintDocument for 
    // which the PrintPage Event has been handled. To display the
    // dialog, either this property or the PrinterSettings property 
    // must be set 
    PrintDialog1.Document = docToPrint;

    DialogResult result = PrintDialog1.ShowDialog();

    // If the result is OK then print the document.
    if (result == DialogResult.OK)
    {
        docToPrint.Print();
    }
}

我执行它，打印结果是empty page，我的问题是我可以把数据放在哪里打印？以及如何将打印的数据作为行，每行都有标签和值。

Answer 1

您将 PrintDocument 创建为私有成员：

// Declare the PrintDocument object.
private System.Drawing.Printing.PrintDocument docToPrint =
    new System.Drawing.Printing.PrintDocument();

但这使得很难在正确的时刻附加事件处理程序。我建议使用构造函数：

// Declare the PrintDocument object.
private System.Drawing.Printing.PrintDocument docToPrint; 
     //= new System.Drawing.Printing.PrintDocument();

public Form1()   // the Form ctor
{
   InitializeComponents();
   docToPrint = new System.Drawing.Printing.PrintDocument();
   docToPrint.PrintPage += document_PrintPage; // the missing piece
}