목록보기의 데이터가 자주 변경됩니까? 새로운 이미지 목록을 자주로드합니까?
시나리오를 시도하고로드 시간이 몇 초 (임의의 이미지를 생성하고 있기 때문에)이지만 목록보기를 변경하면 매우 빠른 새로 고침 시간이 발생합니다. [View]
모드는 물론 스크롤링을 변경합니다.
다음은 샘플 코드입니다. 그것을 시도하고 그것이 어떻게 작동하는지 알려주십시오.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
namespace WindowsFormsApplication10
{
public partial class FormListView:
System.Windows.Forms.Form
{
public FormListView()
{
string [] names = null;
this.InitializeComponent();
names = Enum.GetNames(typeof(View));
for (int i=0; i < names.Length; i++)
{
this.comboBox1.Items.Add(names [i]);
if (names [i] == this.ListView.View.ToString())
this.comboBox1.SelectedIndex = i;
}
}
private void comboBox1_SelectedIndexChanged (object sender, EventArgs e)
{
this.ListView.View = (View) Enum.Parse(typeof(View), this.comboBox1.SelectedItem.ToString());
this.ListView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
}
private void ButtonLoadImages_Click (object sender, System.EventArgs e)
{
Image image;
Stopwatch watch;
this.Enabled = false;
this.Cursor = Cursors.WaitCursor;
this.ListView.SmallImageList = null;
this.ListView.LargeImageList = null;
this.ListView.StateImageList = null;
while (this.ImageList.Images.Count > 0)
{
this.ImageList.Images [0].Dispose();
this.ImageList.Images.RemoveAt(0);
}
this.ImageList.ImageSize = new System.Drawing.Size(256, 256);
watch = Stopwatch.StartNew();
for (int i=0; i < 1000; i++)
{
image = new Bitmap(this.ImageList.ImageSize.Width, this.ImageList.ImageSize.Height);
using (Graphics graphics = Graphics.FromImage(image))
{
graphics.Clear(Color.White);
graphics.DrawRectangle(Pens.Red, 10, 10, this.ImageList.ImageSize.Width - 20, this.ImageList.ImageSize.Height - 20);
graphics.DrawString(i.ToString(), this.Font, Brushes.Blue, 20, 20);
}
this.ImageList.Images.Add(image);
}
watch.Stop();
this.ListView.SmallImageList = this.ImageList;
this.ListView.LargeImageList = this.ImageList;
this.ListView.StateImageList = this.ImageList;
this.Text = watch.Elapsed.TotalSeconds.ToString();
this.Cursor = Cursors.Default;
this.Enabled = true;
}
private void ButtonLoadItems_Click (object sender, System.EventArgs e)
{
Stopwatch watch;
ListViewItem item;
this.Enabled = false;
this.Cursor = Cursors.WaitCursor;
this.ListView.Items.Clear();
this.ListView.Columns.Clear();
this.ListView.Columns.Add("Id", "Id");
this.ListView.Columns.Add("Name", "Name");
this.ListView.SmallImageList = null;
this.ListView.LargeImageList = null;
this.ListView.StateImageList = null;
this.ListView.BeginUpdate();
watch = Stopwatch.StartNew();
for (int i=0; i < 1000; i++)
{
item = new ListViewItem();
item.ImageIndex = i;
item.Text = i.ToString();
item.SubItems.Add("qwerty");
this.ListView.Items.Add(item);
}
this.ListView.EndUpdate();
this.ListView.SmallImageList = this.ImageList;
this.ListView.LargeImageList = this.ImageList;
this.ListView.StateImageList = this.ImageList;
this.ListView.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
watch.Stop();
this.Text = watch.Elapsed.TotalSeconds.ToString();
this.Cursor = Cursors.Default;
this.Enabled = true;
}
}
}
내 대답을 확인하고 컴퓨터에서 코드를 시험해보고로드 시간에 차이가 있는지 알려주십시오. –