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C#处理datagridview虚拟模式的方法

2019年07月18日  | 移动技术网IT编程  | 我要评论

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; }
   }
  }
}

希望本文所述对大家的c#程序设计有所帮助。

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