C#处理datagridview虚拟模式的方法
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2023-12-01 16:17:40
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.colle...
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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