C# Winform TreeView CheckBox 部分显示（代码）
public partial class
Form1
: Form
{
private const int
TVIF_STATE = 0x8;
private const int
TVIS_STATEIMAGEMASK = 0xF000;
private const int
TV_FIRST = 0x1100;
private const int
TVM_SETITEM = TV_FIRST + 63;
public
Form1()
{
InitializeComponent();
this
.treeView1.CheckBoxes = true;
this
.treeView1.ShowLines = false;
this
.treeView1.DrawMode = System.Windows.Forms.TreeViewDrawMode.OwnerDrawAll;
this
.treeView1.DrawNode += new System.Windows.Forms.DrawTreeNodeEventHandler(this.treeView_DrawNode);
for
(int i = 0; i < 10;++i)
{
this
.treeView1.Nodes.Add(string.Format("First level {0}", i));
for
(int j = 0; j < 5;j++)
{
this
.treeView1.Nodes[i].Nodes.Add(string.Format("Second level {0}", j));
for
(int k = 0; k < 5;k++)
{
this
.treeView1.Nodes[i].Nodes[j].Nodes.Add(string.Format("Thirdlevel {0}", k));
}
}
}
this
.treeView1.ExpandAll();
}
Private void
treeView_DrawNode(object sender, DrawTreeNodeEventArgse)
{
if
(e.Node.Level == 1)
HideCheckBox(this.treeView1,e.Node);
e.DrawDefault = true;
}
[
StructLayout
(LayoutKind.Sequential,Pack = 8, CharSet = CharSet.Auto)]
Private struct
TVITEM
{
Public int
mask;
Public
IntPtr
hItem;
Public int
state;
Public int
stateMask;
[
MarshalAs
(UnmanagedType.LPTStr)]
Public string
lpszText;
Public int
cchTextMax;
Public int
iImage;
Public int
iSelectedImage; public int cChildren;public IntPtr lParam;
}
[
DllImport
("user32.dll",CharSet = CharSet.Auto)]
Private static extern
IntPtr
SendMessage(IntPtr hWnd,int Msg, IntPtr wParam,ref TVITEM lParam);
///<summary>
///
Hides the checkbox for the specified node on a TreeView control.
///</summary>
Private void
HideCheckBox(TreeView tvw, TreeNodenode)
{
TVITEM
tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
SendMessage(tvw.Handle, TVM_SETITEM,
IntPtr
.Zero, ref tvi);
}
}