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POprint data from multicolumn listview c#
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  1. POprint data from multicolumn listview c#
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    copied!<p>i view all the data receive in multicolumn listbox. when i click print button, it will print out all the data review in listbox.</p> <p>this is my code:</p> <p><strong>1.</strong> at first, the user will search keyword based on ID. then it will appear in multicolumn listview.this data is search in an xml file.</p> <pre><code>XmlDocument xml = new XmlDocument(); xml.Load("C:\\Users\\HDAdmin\\Documents\\Fatty\\SliceEngine\\SliceEngine\\bin\\Debug\\patient.xml"); XmlNodeList xnList = xml.SelectNodes("/main/patient"); foreach (XmlNode xn in xnList) { string date = xn.OfType&lt;XmlNode&gt;().FirstOrDefault(n =&gt; n.Name == "Date").FirstChild.Value; string id = xn.OfType&lt;XmlNode&gt;().FirstOrDefault(n =&gt; n.Name == "ID").FirstChild.Value; if (date == cari) { listviewitem = new ListViewItem(date); listviewitem.SubItems.Add("Smith"); this.listView1.Items.Add(listviewitem); } if (id == cari) { listviewitem = new ListViewItem(date); id = xn.OfType&lt;XmlNode&gt;().FirstOrDefault(n =&gt; n.Name == "ID").FirstChild.Value; listviewitem.SubItems.Add(id); string level = xn.OfType&lt;XmlNode&gt;().FirstOrDefault(n =&gt; n.Name == "Level").FirstChild.Value; listviewitem.SubItems.Add(level); string name = xn.OfType&lt;XmlNode&gt;().FirstOrDefault(n =&gt; n.Name == "Name").FirstChild.Value; listviewitem.SubItems.Add(name); </code></pre> <p><strong>2.</strong> in the same method, i add up the print event button</p> <pre><code> this.components = new System.ComponentModel.Container(); this.printBut = new System.Windows.Forms.Button(); this.ClientSize = new System.Drawing.Size(504, 381); this.Text = "Print Example"; printBut.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft; printBut.Location = new System.Drawing.Point(32, 110); printBut.FlatStyle = System.Windows.Forms.FlatStyle.Flat; printBut.TabIndex = 0; printBut.Text = "Print the file."; printBut.Size = new System.Drawing.Size(136, 40); printBut.Click += new System.EventHandler(printBut_Click); this.Controls.Add(printBut); //-------------print----------------- </code></pre> <p><strong>3.</strong> this is printBut_click.</p> <pre><code>private void printBut_Click(object sender, EventArgs e) { try { StreamReader streamToPrint = new StreamReader("C:\\Users\\HDAdmin\\Documents\\Fatty\\SliceEngine\\SliceEngine\\bin\\Debug\\aboutREPCS.txt"); try { printFont = new Font("Arial", 10); pd = new PrintDocument(); pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage); pd.Print(); } finally { streamToPrint.Close(); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } </code></pre> <p><strong>4.</strong> this is printPage event </p> <pre><code>// The PrintPage event is raised for each page to be printed. private void pd_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); // Print each line of the file. while (count &lt; linesPerPage &amp;&amp; ((line = streamToPrint.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; } </code></pre> <p>when i run this code, it appears <code>object reference not set to an instance of an object</code>. <img src="https://i.stack.imgur.com/y2OwK.png" alt="enter image description here"></p> <p>so, let me repeat the flow of this application.</p> <pre><code>User insert keyword. If keyword match, view data from xml file into multicolumn listview. printBut will print all the data view in listview. </code></pre>
 

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