zhuzhao 通过本文主要向大家介绍了马桶c的个人空间,c语言,欲情 c max,维生素c,crh2c等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
本文实例讲述了C#处理datagridview虚拟模式的方法。分享给大家供大家参考。具体如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace VirtualMode
{
partial class VirtualModeForm : Form
{
private List<DataObject> m_Data = new List<DataObject>();
private List<bool> m_Visited = new List<bool>();
public VirtualModeForm()
{
InitializeComponent();
m_Grid.CellValueNeeded += OnCellValueNeeded;
m_GetVisitedCountButton.Click += OnGetVisitedCount;
InitData();
InitGrid();
}
private void InitData()
{
for (int i = 0; i < 1000001; i++)
{
m_Visited.Add(false);
DataObject obj = new DataObject();
obj.Id = i;
obj.Val = 2 * i;
m_Data.Add(obj);
}
}
private void InitGrid()
{
m_Grid.VirtualMode = true;
m_Grid.ReadOnly = true;
m_Grid.AllowUserToAddRows = false;
m_Grid.AllowUserToDeleteRows = false;
m_Grid.ColumnCount = 3;
m_Grid.Rows.Add();
m_Grid.Rows.AddCopies(0, 1000000);
// Uncomment the next line and comment out the
// the rest of the method to switch to data bound mode
//m_Grid.DataSource = m_Data;
}
private void OnCellValueNeeded(object sender,
DataGridViewCellValueEventArgs e)
{
m_Visited[e.RowIndex] = true;
if (e.ColumnIndex == 0)
{
e.Value = m_Data[e.RowIndex].Id;
}
else if (e.ColumnIndex == 1)
{
e.Value = m_Data[e.RowIndex].Val;
}
else if (e.ColumnIndex == 2)
{
Random rand = new Random();
e.Value = rand.Next();
}
}
private void OnGetVisitedCount(object sender, EventArgs e)
{
int count = 0;
foreach (bool b in m_Visited)
{
if (b) count++;
}
MessageBox.Show(count.ToString());
}
private void VirtualModeForm_Load(object sender, EventArgs e)
{
}
}
public class DataObject
{
private int m_Id;
private int m_Val;
public int Val
{
get { return m_Val; }
set { m_Val = value; }
}
public int Id
{
get { return m_Id; }
set { m_Id = value; }
}
}
}
</div>
希望本文所述对大家的C#程序设计有所帮助。
</div>