Question

我在程序中创建了一个打印按钮，我的意图是用文本，图像和变量内容打印不同的行和列。

我已经查看了Graphics方法，并在下面的代码中进行了测试。我在另一个方法中定义了一些变量，我想在字符串旁边打印这些变量的内容。谁能指导如何使用图形方法？

private void btn_print_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            PrintDocument pd = new PrintDocument();
            pd.DefaultPageSettings.PaperSize = new PaperSize("A4", 827, 1169);
            pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage);
            pd.Print();
        }
        catch (Exception ex)
        {
            MessageBox.Show("An error occurred while printing", ex.ToString());
        }
    }

    private void pd_PrintPage(object sender, PrintPageEventArgs e)
    {            
        String drawString = "Test";
        e.Graphics.DrawString(drawString, new Font("Verdana", 14), new SolidBrush(System.Drawing.Color.Black), 20,20);
    }

以下是定义变量的按钮的代码：

private void btn_calculate_Click(object sender, RoutedEventArgs e)
    {
        int aa = Int32.Parse(tb_windvelocity.Text);
        int bb = Int32.Parse(tb_height.Text);
        int cc = Int32.Parse(tb_area.Text);
        int dd = Int32.Parse(tb_sc.Text);
        double ee = Math.Sin((Int32.Parse(tb_angle.Text)) * (Math.PI / 180));

        double g = 0;
        if (this.cb_gust.SelectedItem==cb_gust1)
        {
            g = 3;
        }
        else if(this.cb_gust.SelectedItem == cb_gust2)
        {
           g = 15;
        }


        double ff = 5.73 * (Math.Pow(10,-2)) * (Math.Sqrt(1 + (0.15 * aa)));

        double gg = aa * (1 + (ff * (Math.Log(bb / 10))));

        double hh = 0.06 * (1 + (0.043 * aa)) * Math.Pow((bb / 10), (-0.22));

        double ii = gg * (1 - (0.41 * hh * Math.Log(g / 3600)));

        double jj1 = (0.5 * 1.225 * dd * cc * Math.Pow(ii, 2) * ee)/1000;
        double jj2 = (0.5 * 1.225 * dd * Math.Pow(ii, 2) * ee) / 1000;
        lbl_windaction1.Content = Math.Round(jj1,2);
        lbl_windaction2.Content = Math.Round(jj2,2);

    }

Answer 1

private string getMyString()
{
    return "Hello world";
}

private void pd_PrintPage(object sender, PrintPageEventArgs e)
{            
    String drawString = this.getMyString();
    e.Graphics.DrawString(drawString, new Font("Verdana", 14), new SolidBrush(System.Drawing.Color.Black), 20,20);
}

正如TaW所说，您无法访问另一个方法的局部变量，因此您需要定义一个返回变量并在pd_PrintPage内调用它的方法。

编辑（更新代码）

您的代码似乎只是数学范围，但 calculate 和 print 将分别从两个不同的按钮触发。

因此，在这种情况下，TaW提供的原则正确：

private double jj1, jj2;

private void btn_calculate_Click(object sender, RoutedEventArgs e)
{
    double jj1 = // code removed for clarity 
    double jj2 = // code removed for clarity 

    this.jj1 = jj1;
    this.jj2 = jj2;
}

然后，进入pd_PrintPage方法：

private void pd_PrintPage(object sender, PrintPageEventArgs e)
{            
    String drawString = this.jj1.ToString();
    String drawString2 = this.jj2.ToString();

    // now draw with graphics
}

希望这有帮助！

使用图形方法打印变量的内容

1 个答案: