C#  ListBox操作实况

 
 
 

  
  
  
protectedvoidButton1_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemnewItem=newListItem();  
  
  
  
newItem.Text=this.TextBox3.Text;  
  
  
  
newItem.Value=this.TextBox4.Text;  
  
  
  
this.ListBox1.Items.Add(newItem);  
  
  
  
}  
  
  
  
//得到设置最大数量  
  
  
  
//原Capacity的容量为8，默认的情况下会随着新增项(ListItem)的数量增多会成２倍的增长81632..  
  
  
  
//但如果设置了Capacity的大小，就不会自动增长了  
  
  
  
protectedvoidButton2_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
Response.Write("原大小:"+this.ListBox1.Items.Capacity.ToString());  
  
  
  
this.ListBox1.Items.Capacity=6;  
  
  
  
Response.Write("更改后:"+this.ListBox1.Items.Capacity.ToString());}//清空items集合中所有的项  
  
  
  
protectedvoidButton3_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
this.ListBox1.Items.Clear();  
  
  
  
}//判断集合中是否包含指定项  
  
  
  
protectedvoidButton4_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemitem=newListItem(this.TextBox1.Text,this.TextBox2.Text);  
  
  
  
if(this.ListBox1.Items.Contains(item))  
  
  
  
{  
  
  
  
Response.Write("yes");;  
  
  
  
}  
  
  
  
else  
  
  
  
{  
  
  
  
Response.Write("no");  
  
  
  
}}//将items中的所有项复制到listItemCollection集合中  
  
  
  
protectedvoidButton5_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItem[]items=newListItem[this.ListBox1.Items.Count];  
  
  
  
this.ListBox1.Items.CopyTo(items,0);  
  
  
  
ListBoxlistBox2=newListBox();  
  
  
  
listBox2.ID="ListBox2";  
  
  
  
listBox2.Items.AddRange(items);  
  
  
  
//得到ListBox1的位置，并将listBox2放到ListBox1后面  
  
  
  
intposition=0;  
  
  
  
foreach(Controlcinthis.form1.Controls)  
  
  
  
{  
  
  
  
position++;  
  
  
  
if(c.ID=="ListBox1")  
  
  
  
{  
  
  
  
break;  
  
  
  
}  
  
  
  
}  
  
  
  
this.form1.Controls.AddAt(position,listBox2);}//得到集合中项的数量protectedvoidButton6_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
Response.Write(this.ListBox1.Items.Count.ToString());  
  
  
  
}  
  
  
  
//根据文本查找,如果找到则返回此项，如果找不到则返加null  
  
  
  
protectedvoidButton7_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemitem=this.ListBox1.Items.FindByText(this.TextBox1.Text);  
  
  
  
if(item!=null)  
  
  
  
{  
  
  
  
Response.Write(item.Text+":"+item.Value);  
  
  
  
}  
  
  
  
}  
  
  
  
//根据值查找,如果找到则返回此项，如果找不到则返加null  
  
  
  
protectedvoidButton8_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemitem=this.ListBox1.Items.FindByText(this.TextBox2.Text);  
  
  
  
if(item!=null)  
  
  
  
{  
  
  
  
Response.Write(item.Text+":"+item.Value);  
  
  
  
}  
  
  
  
}  
  
  
  
//所查找项的索引  
  
  
  
protectedvoidButton9_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemitem=this.ListBox1.Items.FindByText(this.TextBox1.Text);  
  
  
  
if(item!=null)  
  
  
  
{  
  
  
  
intposition=this.ListBox1.Items.IndexOf(item);  
  
  
  
Response.Write("所查找项的索引:"+position.ToString());  
  
  
  
}  
  
  
  
}//插入新建项  
  
  
  
protectedvoidButton10_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemnewItem=newListItem(this.TextBox1.Text,this.TextBox2.Text);  
  
  
  
this.ListBox1.Items.Insert(0,newItem);  
  
  
  
}//删除节点  
  
  
  
protectedvoidButton11_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
ListItemitem=newListItem(this.TextBox1.Text,this.TextBox2.Text);  
  
  
  
this.ListBox1.Items.Remove(item);  
  
  
  
}//根据索引位置删除  
  
  
  
protectedvoidButton12_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
intindex=this.ListBox1.Items.IndexOf(newListItem(this.TextBox1.Text,this.TextBox2.Text));  
  
  
  
this.ListBox1.Items.RemoveAt(index);  
  
  
  
}//选中项  
  
  
  
protectedvoidButton13_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
this.TextBox1.Text=this.ListBox1.SelectedItem.Text;  
  
  
  
this.TextBox2.Text=this.ListBox1.SelectedItem.Value;  
  
  
  
}//修改  
  
  
  
protectedvoidButton14_Click(objectsender,EventArgse)  
  
  
  
{  
  
  
  
this.ListBox1.SelectedItem.Text=this.TextBox3.Text;  
  
  
  
this.ListBox1.SelectedItem.Value=this.TextBox4.Text;  
  
  
  
}  
  
  
  
 
 
 
 

以上介绍了C#  ListBox的操作方法，可谓是C#  ListBox操作实况，希望能给大家带来帮助。

本文题目：经典C#ListBox操作实况
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