一、TreeList的GetStateImage事件應用。

方法一：此事件用于在tree之前設置顯示的圖片，具體使用方法是首先在窗體上放置imagelist,設置好圖片，即可在事件中判斷后，選擇要顯示的圖片的索引值即可。

private void treeList_GetStateImage(object sender,
 
DevExpress.XtraTreeList.GetStateImageEventArgs e)
 
  {
 
   CheckState check = GetCheckState(e.Node.Tag);
 
   if(check == CheckState.Unchecked)
 
    e.NodeImageIndex = 0;
 
   else if(check == CheckState.Checked)
 
    e.NodeImageIndex = 1;
 
   else e.NodeImageIndex = 2;
 
  }

方法二：為tree中指定的節點區分現實不同的圖片。

事例代碼如下：

private void roleTree_GetStateImage(object sender,
 
DevExpress.XtraTreeList.GetStateImageEventArgs e)
 
        {
 
            if(e.Node.Id.ToString() == "0")
 
            {
 
                this.roleTree.Nodes[0].RootNode.StateImageIndex = 1;
 
            }
 
            else
 
            {
 
                e.NodeImageIndex = 0;
 
            }
 
        }

二、TreeList中運用MouseDown事件獲取所選節點信息。

提取tree中的值所用事件為MouseDown，在事件中填寫如下代碼：

private void roleTree_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
 
        {
 
            if(e.Button == MouseButtons.Left)
 
            {
 
                DevExpress.XtraTreeList.TreeListHitInfo hInfo =
 
roleTree.GetHitInfo(new Point(e.X, e.Y));
 
                if(hInfo.HitInfoType ==
 
DevExpress.XtraTreeList.HitInfoType.StateImage)
 
                {
 
//                  this.roleTree.DeleteNode(hInfo.Node);
 
                  
 
if(MessageBox.Show("你確定要刪除"+hInfo.Node[1].ToString()+"角色","提示信

息",MessageBoxButtons.YesNo,MessageBoxIcon.Question)==DialogResult.Yes)
 
 
 
                    {
 
                        TB_Accounts_RolesEntity role = new
 
TB_Accounts_RolesEntity();
 
                        role.iRoleID =
 
Convert.ToInt32(hInfo.Node[1].ToString());
 
                        role.Retrieve();
 
                        role.Delete();
 
                        InitRoleTree();
 
                    }
 
                    else
 
                    {}
 
                }
 
                else if(hInfo.HitInfoType ==
 
DevExpress.XtraTreeList.HitInfoType.Cell)
 
                {
 
//                    MessageBox.Show(hInfo.Node[1].ToString());  
 
//獲取選擇的iRoleID
 
//                    SetCheckedNode(treeList.Nodes[0].Nodes[0]);
 
 
 
                    //得到指定iRoleID的全部的vDescript的允許的Table
 
                    string roleID = hInfo.Node[1].ToString();
 
                    string sqlString="SELECT
 
dbo.TB_Accounts_Permissions.vDescript FROM dbo.TB_Accounts_Permissions INNER
 
JOIN  dbo.TB_Accounts_RolePermissions ON
 
dbo.TB_Accounts_Permissions.iPermissionID =
 
dbo.TB_Accounts_RolePermissions.iPermissionID WHERE 1=1"; //編寫SQL語句
 
                    sqlString +=" and dbo.TB_Accounts_RolePermissions.iRoleID =
 
'"+roleID+"'";
 
                    //執行SQL語句
 
                    DataTable dt=Query.ProcessSql(sqlString,"EasySales");
 
 
 
                    for(int i = 0; i<dt.Rows.Count; i++)
 
                    {
 
                        string treeText =
 
treeList.GetNodeByVisibleIndex(i).GetDisplayText(0).ToString();
 
                        if(treeText == dt.Rows[i]["vDescript"].ToString())
 
                        {
 
                            SetCheckedNode(treeList.Nodes[0].Nodes[i]);
 
                        }                               
 
                    }
 
 
 
 
 
 
 
/**///////                    //判斷treeList的行數和DataTable的行數是否一致
 
//////                  
 
if(this.treeList.VisibleNodesCount.ToString()==dt.Rows.Count.ToString())
 
//////                    {
 
//////
 
//////                        //循環treeList的全部的vDescript的值
 
//////                        for(int i = 0;
 
i<Convert.ToInt32(this.treeList.VisibleNodesCount.ToString());i++)
 
//////                        {
 
//////                            //判斷treeList的vDescript的值和Table的vDescipte的值是否相等
 
 
 
//////                          
 
if(this.treeList.GetNodeByVisibleIndex(i).GetDisplayText(0).ToString() !=
 
dt.Rows[i]["vDescript"].ToString())
 
//////                            {
 
//////                                MessageBox.Show("得到不同的vDescript");
 
////////                                Checked();
 
//////                            }
 
//////                            else
 
//////                            {
 
//////                                MessageBox.Show("得到相同的vDescript");
 
////////                                UnChecked();
 
//////                            }
 
//////                        }
 
//////                    }
 
//////                    else
 
//////                    {
 
//////                        MessageBox.Show("長度不一致");
 
//////                    }
 
                }
 
            }
 
        } 

三、TreeList前添加CheckBox的選擇框，可實現點擊父節點相應子節點全部選中的效果。

TreeList中并為提供對應實現此功能的CheckBox自定義列，故必須用上面提到的GetStateImage事件添加三個（全選、部分全選、為選中）CheckBox的圖片，具體樣式可自己設計，然后放到窗體中的ImageList中去，觸發及調用用到下面的代碼：

        private CheckState GetCheckState(object obj)
 
        {
 
            if(obj != null) return (CheckState)obj;
 
            return CheckState.Unchecked;
 
        }
 
 
 
        private void SetCheckedNode(string treeText)
 
        {
 
            CheckState check = new CheckState();
 
            check = CheckState.Checked;
 
        }
 
        private void SetCheckedNode(DevExpress.XtraTreeList.Nodes.TreeListNode
 
node)
 
        {
 
            CheckState check = GetCheckState(node.Tag);
 
            if(check == CheckState.Indeterminate || check ==
 
CheckState.Unchecked) check = CheckState.Checked;
 
            else check = CheckState.Unchecked;
 
            treeList.BeginUpdate();
 
            node.Tag = check;
 
            SetCheckedChildNodes(node, check);
 
            SetCheckedParentNodes(node, check);
 
            treeList.EndUpdate();
 
        }
 
        private void
 
SetCheckedChildNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node, CheckState
 
check)
 
        {
 
            for(int i = 0; i < node.Nodes.Count; i++)
 
            {
 
                node.Nodes[i].Tag = check;
 
                SetCheckedChildNodes(node.Nodes[i], check);
 
            }
 
        }
 
        private void
 
SetCheckedParentNodes(DevExpress.XtraTreeList.Nodes.TreeListNode node,
 
CheckState check)
 
        {
 
            if(node.ParentNode != null)
 
            {
 
                bool b = false;
 
                for(int i = 0; i < node.ParentNode.Nodes.Count; i++)
 
                {
 
                    if(!check.Equals(node.ParentNode.Nodes[i].Tag))
 
                    {
 
                        b = !b;
 
                        break;
 
                    }
 
                }
 
                node.ParentNode.Tag = b ? CheckState.Indeterminate : check;
 
                SetCheckedParentNodes(node.ParentNode, check);
 
            }
 
        }
 
        private void treeList_GetStateImage(object sender,
 
DevExpress.XtraTreeList.GetStateImageEventArgs e)
 
        {
 
            CheckState check = GetCheckState(e.Node.Tag);
 
            if(check == CheckState.Unchecked)
 
                e.NodeImageIndex = 0;
 
            else if(check == CheckState.Checked)
 
                e.NodeImageIndex = 1;
 
            else e.NodeImageIndex = 2;
 
        }
 
 
 
        private void treeList_KeyDown(object sender,
 
System.Windows.Forms.KeyEventArgs e)
 
        {
 
            if(e.KeyData == Keys.Space)
 
                SetCheckedNode(treeList.FocusedNode);
 
        }
 
 
 
        private void treeList_MouseDown(object sender,
 
System.Windows.Forms.MouseEventArgs e)
 
        {
 
            if(e.Button == MouseButtons.Left)
 
            {
 
                DevExpress.XtraTreeList.TreeListHitInfo hInfo =
 
treeList.GetHitInfo(new Point(e.X, e.Y));
 
                if(hInfo.HitInfoType ==
 
DevExpress.XtraTreeList.HitInfoType.StateImage)
 
                    SetCheckedNode(hInfo.Node);
 
            }
 
        }
 
 
 
        private void roleTree_GetStateImage(object sender,
 
DevExpress.XtraTreeList.GetStateImageEventArgs e)
 
        {
 
            if(e.Node.Id.ToString() == "0")
 
            {
 
                this.roleTree.Nodes[0].RootNode.StateImageIndex = 1;
 
            }
 
            else
 
            {
 
                e.NodeImageIndex = 0;
 
            }
 
        }

這樣就可實現上述功能。