彩票走势图

一、TreeList的GetStateImage事件应用

方法一：此事件用于在tree之前设置显示的图片，具体使用方法是首先在窗体上放置imagelist,设置好图片，即可在事件中判断后，选择要显示的图片的索引值即可。

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：为tree中指定的节点区分现实不同的图片

示例代码如下：

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中运用MouseDown事件获取所选节点信息

提取tree中的值所用事件为MouseDown，在事件中填写如下代码：

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("你确定要删除"+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()); //获取选择的iRoleID

// SetCheckedNode(treeList.Nodes[0].Nodes[0]);

//得到指定iRoleID的全部的vDescript的允许的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"; //编写SQL语句

sqlString +=" and dbo.TB_Accounts_RolePermissions.iRoleID = '"+roleID+"'";

//执行SQL语句

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]);

}

}

/**/////// //判断treeList的行数和DataTable的行数是否一致

////// if(this.treeList.VisibleNodesCount.ToString()==dt.Rows.Count.ToString())

////// {

//////

////// //循环treeList的全部的vDescript的值

////// for(int i = 0; i<Convert.ToInt32(this.treeList.VisibleNodesCount.ToString());i++)

////// {

////// //判断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("长度不一致");

////// }

}

}

三、TreeList前添加CheckBox的选择框，可实现点击父节点相应子节点全部选中的效果

TreeList中并为提供对应实现此功能的CheckBox自定义列，故必须用上面提到的GetStateImage事件添加三个（全选、部分全选、为选中）CheckBox的图片，具体样式可自己设计，然后放到窗体中的ImageList中去，触发及调用用到下面的代码：

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;

}

  }

}

这样就可实现上述功能。

四、Grid中设置、获取指定Cell的值，用下面的方法：

获取：GridView.GetRowCellValue()

设置：GridView.SetRowCellValue()