C#实现listview Group收缩扩展的方法
本文实例讲述了C#实现listviewGroup收缩扩展的方法。分享给大家供大家参考，具体如下：
1、本实例是完善了codeprofect上面charju老师“AddGroupCollapseBehavioronaListviewControl”的一个限制（点击分组后面的图标不能收缩和扩展）；
2、本实列适用于win2008,vista；
3、仅供参考，如有更好的方法，望大家不吝交流~
完整代码如下（只需建一个windows工程，在窗体上拖一个listview控件，取名为aoc，右击编辑代码，把下面的代码粘到窗口就可以了~，但需要注意事件对应）：
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Windows.Forms;
usingSystem.Runtime.InteropServices;
usingSystem.Diagnostics;
namespaceListViewGroup
{
publicpartialclassMainForm:Form
{
publicMainForm()
{
InitializeComponent();
}
[DllImport("user32.dll")]
staticexternintSendMessage(IntPtrwindow,intmessage,intwParam,refLVHITTESTINFOlParam);
[DllImport("user32.dll")]
staticexternintSendMessage(IntPtrwindow,intmessage,intwParam,IntPtrlParam);
privatevoidbtCollapse_Click(objectsender,EventArgse)
{
SetGroupCollapse(GroupState.COLLAPSED|GroupState.COLLAPSIBLE);
}
privatevoidbtExpand_Click(objectsender,EventArgse)
{
SetGroupCollapse(GroupState.EXPANDED|GroupState.COLLAPSIBLE);
}
privatevoidSetGroupCollapse(GroupStatestate)
{
for(inti=0;i<=aoc.Groups.Count;i++)
{
LVGROUPgroup=newLVGROUP();
group.cbSize=Marshal.SizeOf(group);
group.state=(int)state;//LVGS_COLLAPSIBLE
group.mask=4;//LVGF_STATE
group.iGroupId=i;
IntPtrip=IntPtr.Zero;
try
{
ip=Marshal.AllocHGlobal(group.cbSize);
Marshal.StructureToPtr(group,ip,true);
SendMessage(aoc.Handle,0x1000+147,i,ip);//#defineLVM_SETGROUPINFO(LVM_FIRST+147)
}
catch(Exceptionex)
{
System.Diagnostics.Trace.WriteLine(ex.Message+Environment.NewLine+ex.StackTrace);
}
finally
{
if(null!=ip)Marshal.FreeHGlobal(ip);
}
}
}
privatevoidMainForm_Load(objectsender,EventArgse)
{
SetGroupCollapse(GroupState.COLLAPSIBLE);
for(inti=0;i<aoc.Groups.Count;i++)
{
aoc.Groups[i].Tag="EXPANDED";
}
}
privatevoidaoc_MouseDown(objectsender,MouseEventArgse)
{
LVHITTESTINFOlvHitInfo=newLVHITTESTINFO();
Pointp=newPoint(e.X,e.Y);
lvHitInfo.pt=p;
try
{
intid=SendMessage(aoc.Handle,0x1000+18,-1,reflvHitInfo);
if(lvHitInfo.flags==0x50000000)
{
if(aoc.Groups[id].Tag.ToString()=="EXPANDED")
{
SetGroupCollapseEx(id,GroupState.COLLAPSED|GroupState.COLLAPSIBLE);
aoc.Groups[id].Tag="COLLAPSED";
}
elseif(aoc.Groups[id].Tag.ToString()=="COLLAPSED")
{
SetGroupCollapseEx(id,GroupState.EXPANDED|GroupState.COLLAPSIBLE);
aoc.Groups[id].Tag="EXPANDED";
}
}
//MessageBox.Show(string.Format("RESULT={0}FLAGS=0x{1:X}",id,lvHitInfo.flags));
}
catch(Exceptionex)
{
Trace.WriteLine(ex.Message+Environment.NewLine+ex.StackTrace);
}
finally
{
;
}
}
privatevoidSetGroupCollapseEx(intid,GroupStategroupState)
{
inti=id;
LVGROUPgroup=newLVGROUP();
group.cbSize=Marshal.SizeOf(group);
group.state=(int)groupState;//LVGS_COLLAPSIBLE
group.mask=4;//LVGF_STATE
group.iGroupId=i;
IntPtrip=IntPtr.Zero;
try
{
ip=Marshal.AllocHGlobal(group.cbSize);
Marshal.StructureToPtr(group,ip,true);
SendMessage(aoc.Handle,0x1000+147,i,ip);//#defineLVM_SETGROUPINFO(LVM_FIRST+147)
}
catch(Exceptionex)
{
System.Diagnostics.Trace.WriteLine(ex.Message+Environment.NewLine+ex.StackTrace);
}
finally
{
if(null!=ip)Marshal.FreeHGlobal(ip);
}
}
}
[StructLayout(LayoutKind.Sequential)]
publicstructLVGROUP
{
publicintcbSize;
publicintmask;
[MarshalAs(UnmanagedType.LPTStr)]
publicstringpszHeader;
publicintcchHeader;
[MarshalAs(UnmanagedType.LPTStr)]
publicstringpszFooter;
publicintcchFooter;
publicintiGroupId;
publicintstateMask;
publicintstate;
publicintuAlign;
}
publicenumGroupState
{
COLLAPSIBLE=8,
COLLAPSED=1,
EXPANDED=0
}
[StructLayout(LayoutKind.Sequential)]
publicstructLVHITTESTINFO
{
publicPointpt;
publicintflags;
publicintiItem;
publicintiSubItem;
publicintiGroup;
}
}
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