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

示例代碼如下：

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。

四、Grid中設置、獲取指定Cell的值，用下面的方法：

獲取：GridView.GetRowCellValue()

設置：GridView.SetRowCellValue()