[英]c# listbox, ownerdrawfixed, get selected item
我的程序在文件中進行搜索,當找到該字符串時,它會在另一個字符串之間進行過濾,然后在列表框中顯示相應的顏色(紅色表示由第二個過濾器確定的壞行),綠色表示相應的顏色,列表框顯示location \\ file,並在另一行顯示行本身。
現在我想通過dubbelclicking location \\ file來打開文件,但是我的代碼在ownerdrawfixed中無效(我需要/想要顏色)我嘗試過
string filename = listBox1.GetItemText(listBox1.selectedItem);
if (file.exists(filename))//to check if i click on a filename or on a line
{
try
{
System.diagnostics.process.start("scite.exe",filename); //open file with scite
}
catch
{
system.Diagnostics.Process.start(filename);//open file with windows default
}
我了解到字符串“文件名”現在包含“ Datscan.Form1 + MyListboxItem”
找到了很多關於如何將drawmode設置為normal的答案,但是我需要ownerdrawfixed中使用它。
這是我整理的一個最小示例,希望可以幫助您縮小問題范圍。 它不執行選擇,而是在列表框旁邊的標簽中顯示選擇。 但這只是向您顯示適當的值被提取出來。 然后,將值路由到將執行該值而不是顯示該值的瑣事是微不足道的。
using System.Drawing;
using System.Windows.Forms;
namespace ListBox_15948283
{
public partial class Form1 : Form
{
private int ItemMargin = 5;
private int labelCount = 0;
public Form1()
{
InitializeComponent();
ListBox lb = new ListBox();//initialize a new ListBox
lb.DrawMode = DrawMode.OwnerDrawFixed;//lets meet YOUR requirement of OwnerDrawFixed
lb.Location = new Point(25, 25);//position the ListBox
lb.DrawItem += Lb_DrawItem;//give it a Draw event handler
lb.MeasureItem += Lb_MeasureItem;//give it a MeasureItem event handler
lb.Name = "lstbx_Yep";//give the listbox a name so we can call it later
lb.Items.Add("Option 1");//add an option
lb.Items.Add("Option 2");//add an option
lb.Items.Add("Option 3");//add an option
lb.Items.Add("Option 4");//add an option
lb.MouseDoubleClick += Lb_MouseDoubleClick;//add a doubleClick event handler on the ListBox
this.Controls.Add(lb);//add the listbox to the form
}
private void Lb_MouseDoubleClick(object sender, MouseEventArgs e)
{
ListBox lb = ((ListBox)this.Controls.Find("lstbx_Yep", false)[0]);//get the listbox
Label lbl = new Label();//make a label to display the result
lbl.Location = new Point(150, (labelCount * 25) + 50);//position the label
lbl.Text = lb.SelectedItem.ToString();//get the selected item
this.Controls.Add(lbl);//add the label to the form
labelCount++;
}
/*
* Code below taken from
* http://csharphelper.com/blog/2014/11/make-an-owner-drawn-listbox-in-c/
*/
private void Lb_MeasureItem(object sender, MeasureItemEventArgs e)
{
// Get the ListBox and the item.
ListBox lst = sender as ListBox;
string txt = (string)lst.Items[e.Index];
// Measure the string.
SizeF txt_size = e.Graphics.MeasureString(txt, this.Font);
// Set the required size.
e.ItemHeight = (int)txt_size.Height + 2 * ItemMargin;
e.ItemWidth = (int)txt_size.Width;
}
private void Lb_DrawItem(object sender, DrawItemEventArgs e)
{
// Get the ListBox and the item.
ListBox lst = sender as ListBox;
string txt = (string)lst.Items[e.Index];
// Draw the background.
e.DrawBackground();
// See if the item is selected.
if ((e.State & DrawItemState.Selected) ==
DrawItemState.Selected)
{
// Selected. Draw with the system highlight color.
e.Graphics.DrawString(txt, this.Font,
SystemBrushes.HighlightText, e.Bounds.Left,
e.Bounds.Top + ItemMargin);
}
else
{
// Not selected. Draw with ListBox's foreground color.
using (SolidBrush br = new SolidBrush(e.ForeColor))
{
e.Graphics.DrawString(txt, this.Font, br,
e.Bounds.Left, e.Bounds.Top + ItemMargin);
}
}
// Draw the focus rectangle if appropriate.
e.DrawFocusRectangle();
}
}
}
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