我试过这段代码,但它不起作用:
private void LoadKeys(Dictionary<string,List<string>> dictionary, string FileName)
{
string line = System.String.Empty;
using (StreamReader sr = new StreamReader(keywords))
{
while ((line = sr.ReadLine()) != null)
{
string[] tokens = line.Split(',');
dictionary.Add(tokens[0], tokens.Skip(1).ToList());
listBox1.Items.Add(new MyListBoxItem(Color.Green, "Url: " + tokens[0] + " --- " + "Localy KeyWord: " + tokens[1]));
}
}
}
现在是MyListBoxItem类:
public class MyListBoxItem
{
public MyListBoxItem(Color c, string m)
{
ItemColor = c; Message = m;
}
public Color ItemColor
{
get;
set;
}
public string Message
{
get;
set;
}
}
listBox1_DrawItem事件:
private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
{
MyListBoxItem item = listBox1.Items[e.Index] as MyListBoxItem;
// Get the current item and cast it to MyListBoxItem
if (item != null)
{
e.Graphics.DrawString( // Draw the appropriate text in the ListBox
item.Message, // The message linked to the item
listBox1.Font, // Take the font from the listbox
new SolidBrush(item.ItemColor), // Set the color
0, // X pixel coordinate
e.Index * listBox1.ItemHeight // Y pixel coordinate. Multiply the index by the ItemHeight defined in the listbox.
);
}
else
{
// The item isn't a MyListBoxItem, do something about it
}
}
在使用颜色和绘制项目尝试此前的ListBox中,我使用了这一行:
listBox1.Items.Add("Url: " + tokens[0] + " --- " + "Localy KeyWord: " + tokens[1]);
结果如下:网址:http://www.google.com --- Localy KeyWord:google
现在,当试图用绿色对这条线进行着色时,颜色仍然是黑色,而listBox中的文字现在是:
GatherLinks.Form1 + MyListBoxItem很奇怪。
我想要做的是在listBox的第一行中着色Url:在红色中---蓝色和localykeyword:黄色 在第二行中,Url:绿色中的---红色,以及值为例如谷歌中的蓝色。
我该怎么做?
答案 0 :(得分:0)
您是否更改了列表框的DrawMode属性以允许所有者绘图?
listBox1.DrawMode = DrawMode.OwnerDrawFixed;
答案 1 :(得分:0)
我在我的一个项目中这样做。按照上面的Turnkey,我有以下几行:
tasksListBox.DrawMode = DrawMode.OwnerDrawFixed;
tasksListBox.DrawItem += listBox_DrawItem;
在我的表单的初始化代码中。 DrawItem的代码处理选择颜色
之类的事情private void listBox_DrawItem(object sender, DrawItemEventArgs e)
{
if (e.Index == -1)
{
return;
}
e.DrawBackground();
Graphics g = e.Graphics;
var selected = (e.State & DrawItemState.Selected) == DrawItemState.Selected;
var lb = (ListBox)sender;
if (selected)
{
g.FillRectangle(new SolidBrush(Color.DarkBlue), e.Bounds);
g.DrawString(lb.Items[e.Index].ToString(), e.Font, new SolidBrush(Color.White), new PointF(e.Bounds.X, e.Bounds.Y));
return;
}
var item = (ProjectToDoRecord)lb.Items[e.Index];
var textColor = item.TrafficLight();
g.FillRectangle(new SolidBrush(Color.White), e.Bounds);
g.DrawString(lb.Items[e.Index].ToString(), e.Font, new SolidBrush(textColor), new PointF(e.Bounds.X, e.Bounds.Y));
}
绘制的每个项目的颜色由textColor决定。这被设置为正在绘制的项目中定义的颜色。