C＃PrintDocument只打印空白頁

Question

我試圖打印DataGridView，而打印機只打印白頁。 我知道datagridview不是空的，因爲它出現在窗體上。 我也試着用PrintPreviewDialog做它，但它的顯示也是一個白頁。 代碼是這樣的，我不知道什麼是錯的。

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.Drawing.Printing; 

namespace Prueba 
{ 
    public partial class Form4 : Form 
    { 
     public Form4() 
     { 
      InitializeComponent(); 
     } 
     private void imprimirBtn_Click(object sender, EventArgs e) 
     { 
      printDocument1.Print(); 
     } 
     private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) 
     { 
      Font printFont = new Font("Arial", 10); 
      float topMargin = e.MarginBounds.Top; 
      float yPos = 0; 
      float linesPerPage = 0; 
      int count = 0; 
      string texto = ""; 
      int i = -1; 
      DataGridViewRow row; 

      linesPerPage = e.MarginBounds.Height/printFont.GetHeight(e.Graphics); 

      while (count < linesPerPage && i < this.dataGridView1.Rows.Count) 
      { 
       row = dataGridView1.Rows[i]; 
       texto = ""; 

       foreach (DataGridViewCell celda in row.Cells) 
       { 
        texto += "\t" + celda.Value.ToString(); 
       } 
       yPos = topMargin + (count * printFont.GetHeight(e.Graphics)); 
       e.Graphics.DrawString(texto, printFont, Brushes.Black, 10, yPos); 

       count++; 
       i++; 
       if (i < this.dataGridView1.Rows.Count) 
        e.HasMorePages = true; 
       else 
       { 
        i = 0; 
       } 
      } 
    } 
} 

Answer 1

您忘記爲打印過程添加EventHandler。

private void imprimirBtn_Click(object sender, EventArgs e) 
    { 
     printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage); 
     printDocument1.Print(); 
    }