概述：本文主要講述DevExpress TreeList復選框實現，希望對大家有幫助。
一、TreeList的GetStateImage事件應用
方法一：此事件用於在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。
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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;
}
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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：
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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;
}
}
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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：
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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");
////// }
}
}
}
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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中並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：
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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;
}
}
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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()