c# ListView 虚拟模式 相关操作
public class ListViewEx : ListView
{
#region 虚拟模式相关操作
///<summary>
/// 前台行集合
///</summary>
public List<ListViewItem> CurrentCacheItemsSource;
public ListViewEx()
{
this.CurrentCacheItemsSource = new List<ListViewItem>();
this.VirtualMode = true;
this.RetrieveVirtualItem += new RetrieveVirtualItemEventHandler(listView_RetrieveVirtualItem);
}
///<summary>
/// 重置listview集合
///</summary>
///<param name="l"></param>
public void ReSet(IList<ListViewItem> l)
{
this.CurrentCacheItemsSource.Clear();
this.CurrentCacheItemsSource = new List<ListViewItem>();
foreach (var item in l)
{
this.CurrentCacheItemsSource.Add(item);
}
this.VirtualListSize = this.CurrentCacheItemsSource.Count;
}
///<summary>
/// 虚拟模式事件
///</summary>
///<param name="sender"></param>
///<param name="e"></param>
private void listView_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
{
if (this.CurrentCacheItemsSource == null || this.CurrentCacheItemsSource.Count == 0)
{
return;
}
ListViewItem lv = this.CurrentCacheItemsSource[e.ItemIndex];
e.Item = lv;
}
///<summary>
/// 获取选中的第一行的指定tag值
///</summary>
///<param name="key"></param>
///<returns></returns>
public string FirstSelectItemValue(string key)
{
int i = GetColumnsIndex(key);
return this.CurrentCacheItemsSource[this.SelectedIndices[0]].SubItems[i].Text;
}
///<summary>
/// 获取列名的索引
///</summary>
///<param name="key"></param>
///<returns></returns>
public int GetColumnsIndex(string key)
{
int i = 0;
for (; i < this.Columns.Count; i++)
{
if (this.Columns[i].Name == key)
{
break;
}
}
return i;
}
///<summary>
/// 获取选中项
///</summary>
///<returns></returns>
public List<ListViewItem> GetSelectItem()
{
List<ListViewItem> l = new List<ListViewItem>();
foreach (var item in this.SelectedIndices)
{
l.Add(this.CurrentCacheItemsSource[int.Parse(item.ToString())]);
}
return l;
}
///<summary>
/// 获取选中行的某列集合
///</summary>
///<param name="key"></param>
///<returns></returns>
public List<string> GetListViewField(string key)
{
List<string> ids = new List<string>();
foreach (var item in this.SelectedIndices)
{
string id = this.CurrentCacheItemsSource[int.Parse(item.ToString())].SubItems[GetColumnsIndex(key)].Text;
ids.Add(id);
}
return ids;
}
private ListViewItemComparer mySorter;
///<summary>
/// 排序
///</summary>
///<param name="e"></param>
protected override void OnColumnClick(ColumnClickEventArgs e)
{
base.OnColumnClick(e);
string dbType = this.Columns[e.Column].Tag.ToString();
if (this.mySorter == null)
{
this.mySorter = new ListViewItemComparer(e.Column, SortOrder.Ascending, dbType);
}
else
{
if (this.mySorter.SortColumn == e.Column)
{
if (this.mySorter.Order == SortOrder.Ascending)
{
this.mySorter.Order = SortOrder.Descending;
}
else
{
this.mySorter.Order = SortOrder.Ascending;
}
}
else
{
this.mySorter.SortColumn = e.Column;
this.mySorter.Order = SortOrder.Ascending;
}
this.mySorter.DbType = dbType;
this.CurrentCacheItemsSource.Sort(this.mySorter);
this.Invalidate();
}
}
#endregion
#region 普通模式下排序
/*普通模式下排序
public void ReLoadColumn()
{
this.ListViewItemSorter = new ListViewItemComparer(0, SortOrder.Ascending, this.Columns[0].Tag.ToString());
}
protected override void OnColumnClick(ColumnClickEventArgs e)
{
base.OnColumnClick(e);
string dbType = this.Columns[e.Column].Tag.ToString();
if (this.ListViewItemSorter == null)
{
this.ListViewItemSorter = new ListViewItemComparer(e.Column, SortOrder.Ascending, dbType);
}
else
{
ListViewItemComparer comparer = this.ListViewItemSorter as ListViewItemComparer;
if (comparer.SortColumn == e.Column)
{
if (comparer.Order == SortOrder.Ascending)
{
comparer.Order = SortOrder.Descending;
}
else
{
comparer.Order = SortOrder.Ascending;
}
}
else
{
comparer.SortColumn = e.Column;
comparer.Order = SortOrder.Ascending;
}
//MessageBox.Show(dbType);
comparer.DbType = dbType;
//仅仅改变了ListViewItemSorter属性值，这里不会自动调用Sort()方法，需要显式指定执行Sort()方法实现排序。
this.Sort();
}
}
*/
#endregion
#region ListView排序逻辑
///<summary>
/// ListView排序逻辑
///</summary>
private class ListViewItemComparer : System.Collections.Generic.IComparer<ListViewItem>
{
public string DbType;
public ListViewItemComparer()
{
this.SortColumn = 0;
this.Order = SortOrder.None;
}
public ListViewItemComparer(int column)
: this()
{
this.SortColumn = column;
}
///<summary>
///
///</summary>
///<param name="column">哪列</param>
///<param name="sortOrder">排序方式</param>
///<param name="dbType">类型</param>
public ListViewItemComparer(int column, SortOrder sortOrder, string dbType)
: this(column)
{
Order = sortOrder;
DbType = dbType.ToLower();
}
#region IComparer 成员
public int Compare(ListViewItem x, ListViewItem y)
{
int result = 0;
string c1 = "";
string c2 = "";
try
{
c1 = x.SubItems[this.SortColumn].Text;
c2 = y.SubItems[this.SortColumn].Text;
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message);
return 0;
}
switch (DbType)
{
case "int":
result = Fn.IsInt(c1, 0) - Fn.IsInt(c2, 0);
break;
case "datetime":
DateTime t1 = Fn.IsDate(c1, DateTime.MinValue);
DateTime t2 = Fn.IsDate(c2, DateTime.MinValue);
if (DateTime.TryParse(c1, out t1) && DateTime.TryParse(c2, out t2))
{
int cha1 = Fn.IsInt((t1 - t2).TotalSeconds.ToString(), 0);
result = Fn.IsInt((t1 - t2).TotalSeconds.ToString(), 0);
if (cha1 == 0)
result = 0;
else if (cha1 < 0)
result = -1;
else
result = 1;
}
else
{
result = string.Compare(c1, c2);
}
break;
case "double":
double d1 = Fn.IsDouble(c1, 0);
double d2 = Fn.IsDouble(c2, 0);
if (d1 == d2)
result = 0;
else if (d1 < d2)
result = -1;
else
result = 1;
break;
default:
result = string.Compare(c1, c2);
break;
}
if (this.Order == SortOrder.Ascending)
{
return result;
}
else if (this.Order == SortOrder.Descending)
{
return (-result);
}
else
{
return 0;
}
}
#endregion
///<summary>
/// 当前排序列
///</summary>
public int SortColumn
{
get;
set;
}
///<summary>
/// 当前列排序方式
///</summary>
public SortOrder Order
{
get;
set;
}
}
#endregion
}
主要功能使用方法:
添加列
AddLVCol("first", "null", "", 0);
AddLVCol("id", "int", "", 0);
AddLVCol("index", "int", "序号", 40);
AddLVCol("name", "text", "产品名称", 200);
...
protected void AddLVCol(string pName, string pTag, string pText, int pWidth)
{
ColumnHeader ch = new ColumnHeader();
ch.Name = pName;
ch.Tag = pTag;
ch.Text = pText;
ch.Width = pWidth;
this.listV.Columns.Add(ch);
}
添加内容
List<ListViewItem> listItem = new List<ListViewItem>();
listItem.Add.....
this.listV.ReSet(listItem);
删除内容时选择列id集合
List<string> idList = this.listV.GetListViewField("id");
修改内容时获取id
int id = int.Parse(this.listV.FirstSelectItemValue("id"));
获当前选中的集合
List<ListViewItem> listData=this.listV.CurrentCacheItemsSource;
