[英]read items from listbox
I have a listbox with 1 or more textfiles, which im going to print as commands. 我有一个包含1个或多个文本文件的列表框,我将它们打印为命令。 but I dont know how to make the streamreader read from listbox ?
但我不知道如何使流阅读器从列表框中读取?
so far I got this.: 到目前为止,我明白了:
public void OutputBtn_Click(object sender, EventArgs e)
{
PrintDocument PrintD = new PrintDocument();
PrintD.PrintPage += new PrintPageEventHandler(this.PrintDocument_PrintPage);
StreamReader SR = new StreamReader("C:\\myfile.txt");
PrintD.Print();
}
is there enyway I can change "C:\\myfile.txt" or do I have to use "foreach" ? 我可以更改“ C:\\ myfile.txt”还是必须使用“ foreach”吗?
Do you want something like this? 你想要这样的东西吗? I don't fully understand the question
我不完全明白这个问题
string[] fileEntries = Directory.GetFiles("C:\\temp\\").Where(p =>
p.EndsWith(".txt")).ToArray<string>();
foreach (string fileName in fileEntries)
{
lb.Items.Add(new ListItem(fileName, fileName);
}
Ok so you have the listbox filled with filenames? 好的,这样您的列表框中就充满了文件名吗?
private StreamReader sr;
public void OutputBtn_Click(object sender, EventArgs e)
{
foreach(var li in lb.Items)
{
PrintDocument PrintD = new PrintDocument();
PrintD.PrintPage += new PrintPageEventHandler(this.PrintDocument_PrintPage);
sr = new StreamReader(li.ToString());
PrintD.Print();
}
}
private void PrintDocument_PrintPage(object sender, PrintPageEventArgs ev)
{
float linesPerPage = 0;
float yPos = 0;
int count = 0;
float leftMargin = ev.MarginBounds.Left;
float topMargin = ev.MarginBounds.Top;
String line = null;
// Calculate the number of lines per page.
linesPerPage = ev.MarginBounds.Height /
printFont.GetHeight(ev.Graphics) ;
// Iterate over the file, printing each line.
while (count < linesPerPage && ((line = sr.ReadLine()) != null))
{
yPos = topMargin + (count * printFont.GetHeight(ev.Graphics));
ev.Graphics.DrawString (line, printFont, Brushes.Black,
leftMargin, yPos, new StringFormat());
count++;
}
// If more lines exist, print another page.
if (line != null)
ev.HasMorePages = true;
else
ev.HasMorePages = false;
}
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