.net winform下TreeNode在没有子结点时也显示+号的解决办法
TreeNode竟然没有HasChildren属性，ft!
今天写程序时遇到这个问题，找了msdn及参考这里：http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B313134，花了2个小时才搞定这个问题，特此一记。
代码如下（vs2k5上调试通过)：
using System.Runtime.InteropServices;
今天写程序时遇到这个问题，找了msdn及参考这里：http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B313134，花了2个小时才搞定这个问题，特此一记。
代码如下（vs2k5上调试通过)：
using System.Runtime.InteropServices;
classTreeNodeHelper
{
TreeNodetreeNode=null;
publicTreeNodeHelper(TreeNodetr)
{
treeNode=tr;
}
/**////<summary>
///返回TreeNode是否有子结点
///</summary>
publicboolHasChildren
{
get
{
returnIsTreeNodeHasChildren(treeNode);
}
set
{
MakeTreeNodeHasChildren(treeNode,value);
}
}
publicconstUInt32TV_FIRST=4352;
publicconstUInt32TVSIL_NORMAL=0;
publicconstUInt32TVSIL_STATE=2;
publicconstUInt32TVM_SETIMAGELIST=TV_FIRST+9;
publicconstUInt32TVM_GETNEXTITEM=TV_FIRST+10;
publicconstUInt32TVIF_HANDLE=16;
publicconstUInt32TVIF_STATE=8;
publicconstUInt32TVIS_STATEIMAGEMASK=61440;
publicconstUInt32TVM_SETITEM=TV_FIRST+13;
publicconstUInt32TVM_GETITEM=TV_FIRST+12;
publicconstUInt32TVGN_ROOT=0;
publicconstintTVIF_CHILDREN=64;
//UseasequentialstructurelayouttodefineTVITEMfortheTreeView.
[StructLayout(LayoutKind.Sequential,Pack=8,CharSet=CharSet.Auto)]
publicstructTV_ITEM
{
publicuintmask;
publicIntPtrhItem;
publicuintstate;
publicuintstateMask;
publicIntPtrpszText;
publicintcchTextMax;
publicintiImage;
publicintiSelectedImage;
publicintcChildren;
publicIntPtrlParam;
}
//DeclaretwooverloadedSendMessagefunctions.The
//differenceisinthelastparameter:oneisByValandthe
//otherisByRef.
[DllImport("user32.dll")]
publicstaticexternUInt32SendMessage(IntPtrhWnd,UInt32Msg,
UInt32wParam,UInt32lParam);
[DllImport("User32",CharSet=CharSet.Auto)]
publicstaticexternIntPtrSendMessage(IntPtrhWnd,UInt32msg,
UInt32wParam,refTV_ITEMlParam);
/**////<summary>
///指定TreeNode是否有子结点（有子结点则TreeNode会显示+号,没有则不会显示）
///</summary>
///<paramname="tr"></param>
///<paramname="bHasChildren"></param>
publicstaticvoidMakeTreeNodeHasChildren(TreeNodetr,boolbHasChildren)
{
TV_ITEMtvItem=newTV_ITEM();
tvItem.mask=TVIF_CHILDREN|TVIF_HANDLE;
tvItem.hItem=tr.Handle;
tvItem.cChildren=bHasChildren?1:0;
SendMessage(tr.TreeView.Handle,TVM_SETITEM,0,reftvItem);
}
/**////<summary>
///返回树结点是否有子结点
///</summary>
///<paramname="?"></param>
///<returns></returns>
publicstaticboolIsTreeNodeHasChildren(TreeNodetr)
{
if(tr.Nodes.Count>0)
{
returntrue;
}
TV_ITEMtvItem=newTV_ITEM();
tvItem.mask=TVIF_CHILDREN|TVIF_HANDLE;
tvItem.hItem=tr.Handle;
SendMessage(tr.TreeView.Handle,TVM_GETITEM,0,reftvItem);
returntvItem.cChildren==1;
}
}
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{
TreeNodetreeNode=null;
publicTreeNodeHelper(TreeNodetr)
{
treeNode=tr;
}
/**////<summary>
///返回TreeNode是否有子结点
///</summary>
publicboolHasChildren
{
get
{
returnIsTreeNodeHasChildren(treeNode);
}
set
{
MakeTreeNodeHasChildren(treeNode,value);
}
}
publicconstUInt32TV_FIRST=4352;
publicconstUInt32TVSIL_NORMAL=0;
publicconstUInt32TVSIL_STATE=2;
publicconstUInt32TVM_SETIMAGELIST=TV_FIRST+9;
publicconstUInt32TVM_GETNEXTITEM=TV_FIRST+10;
publicconstUInt32TVIF_HANDLE=16;
publicconstUInt32TVIF_STATE=8;
publicconstUInt32TVIS_STATEIMAGEMASK=61440;
publicconstUInt32TVM_SETITEM=TV_FIRST+13;
publicconstUInt32TVM_GETITEM=TV_FIRST+12;
publicconstUInt32TVGN_ROOT=0;
publicconstintTVIF_CHILDREN=64;
//UseasequentialstructurelayouttodefineTVITEMfortheTreeView.
[StructLayout(LayoutKind.Sequential,Pack=8,CharSet=CharSet.Auto)]
publicstructTV_ITEM
{
publicuintmask;
publicIntPtrhItem;
publicuintstate;
publicuintstateMask;
publicIntPtrpszText;
publicintcchTextMax;
publicintiImage;
publicintiSelectedImage;
publicintcChildren;
publicIntPtrlParam;
}
//DeclaretwooverloadedSendMessagefunctions.The
//differenceisinthelastparameter:oneisByValandthe
//otherisByRef.
[DllImport("user32.dll")]
publicstaticexternUInt32SendMessage(IntPtrhWnd,UInt32Msg,
UInt32wParam,UInt32lParam);
[DllImport("User32",CharSet=CharSet.Auto)]
publicstaticexternIntPtrSendMessage(IntPtrhWnd,UInt32msg,
UInt32wParam,refTV_ITEMlParam);
/**////<summary>
///指定TreeNode是否有子结点（有子结点则TreeNode会显示+号,没有则不会显示）
///</summary>
///<paramname="tr"></param>
///<paramname="bHasChildren"></param>
publicstaticvoidMakeTreeNodeHasChildren(TreeNodetr,boolbHasChildren)
{
TV_ITEMtvItem=newTV_ITEM();
tvItem.mask=TVIF_CHILDREN|TVIF_HANDLE;
tvItem.hItem=tr.Handle;
tvItem.cChildren=bHasChildren?1:0;
SendMessage(tr.TreeView.Handle,TVM_SETITEM,0,reftvItem);
}
/**////<summary>
///返回树结点是否有子结点
///</summary>
///<paramname="?"></param>
///<returns></returns>
publicstaticboolIsTreeNodeHasChildren(TreeNodetr)
{
if(tr.Nodes.Count>0)
{
returntrue;
}
TV_ITEMtvItem=newTV_ITEM();
tvItem.mask=TVIF_CHILDREN|TVIF_HANDLE;
tvItem.hItem=tr.Handle;
SendMessage(tr.TreeView.Handle,TVM_GETITEM,0,reftvItem);
returntvItem.cChildren==1;
}
}
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