一种加载TreeView数据的新写法

今天在MSDN看到一篇文章，受到启发，便用下面的方式实现TreeView的数据加载。因为使用了spring来注入业务方法，所以不完全贴上代码了，只贴上关键部分。

/// <summary>
/// 执行数据显示
/// </summary>
public void showTree()
{
image1 = Resources.home.ToBitmap();
image2 = Resources.department.ToBitmap();
image3 = Resources.users.ToBitmap();

imageList.Images.Add(image1);
imageList.Images.Add(image2);
imageList.Images.Add(image3);

if (treeDataSupportImpl == null)
{
treeDataSupportImpl = (ITreeDataSupport)AppUtils.getObject("treeDataSupportImpl");
}

// 获取数据
IList treeDataList= treeDataSupportImpl.GetTreeData(false, false);
IList empOrPosList = new List<IDictionary>();
if (isLoadEmployee || isLoadPosition)
{
empOrPosList = treeDataSupportImpl.GetTreeData(isLoadEmployee, isLoadPosition);
}
log.Debug(treeDataList.Count);
if (treeDataList.Count > 0 && treeDataList != null)
{
// 转换为DataTable
this.converListToDataTable(treeDataList);

// 调用数据展现方法
log.Debug("开始创建、、、");
this.createTree(0,(TreeNode)null);

// 如果有数，则加载
if (empOrPosList.Count > 0 && empOrPosList != null)
{
this.addTree(empOrPosList);
}

}
}

/// <summary>
/// 添加员工或职称到树
/// </summary>
/// <param name="list"></param>
public void addTree(IList list)
{
foreach (IDictionary empOrPos in list)
{
TreeNode newNode = new TreeNode();
newNode.Name = empOrPos["ORG_ID"].ToString();
newNode.Text = empOrPos["ORG_NAME"].ToString();
newNode.ImageIndex = 2;
newNode.SelectedImageIndex = 2;
TreeNode node = myTreeView.Nodes.Find(empOrPos["SUPER_ORG_ID"].ToString(), true)[0];
node.Nodes.Add(newNode);
}
}

/// <summary>
/// 创建树
/// </summary>
/// <param name="ParentID"></param>
/// <param name="pNode"></param>
public void createTree(int ParentID,TreeNode pNode)
{
DataView dvTree = new DataView(treeData);
dvTree.RowFilter = "[SUPER_ORG_ID] = " + ParentID;

foreach (DataRowView Row in dvTree)
{
if(pNode == null)
{
log.Debug("根节点：" + Row["ORG_NAME"].ToString());
// 添加根节点
myTreeView.ImageList = imageList;
TreeNode node = myTreeView.Nodes.Add(Row["ORG_NAME"].ToString());
node.Name = Row["ORG_ID"].ToString();
node.ImageIndex = 0;
node.SelectedImageIndex = 0;
// 递归
createTree(Int32.Parse(Row["ORG_ID"].ToString()),node);
}
else
{
log.Debug("节点：" + Row["ORG_NAME"].ToString());
// 添加当前节点
TreeNode node = pNode.Nodes.Add(Row["ORG_NAME"].ToString());
node.Name = Row["ORG_ID"].ToString();
if(Row["ORG_TYPE_ID"].ToString().Equals("2") || Row["ORG_TYPE_ID"].ToString().Equals("3"))
{
node.ImageIndex = 1;
node.SelectedImageIndex = 1;
}
else
{
node.ImageIndex = 2;
node.SelectedImageIndex = 2;
}

//再次递归
createTree(Int32.Parse(Row["ORG_ID"].ToString()),node);
}
}

}

/// <summary>
/// 转换函数
/// </summary>
/// <param name="list"></param>
public void converListToDataTable(IList list)
{
DataColumn dataColumn = treeData.Columns.Add("ORG_ID", typeof(Int32));
dataColumn.AllowDBNull = false;
treeData.Columns.Add("ORG_NAME", typeof(String));
treeData.Columns.Add("SUPER_ORG_ID", typeof(Int32));
treeData.Columns.Add("ORG_TYPE_ID", typeof(Int32));

foreach (IDictionary dict in list)
{
DataRow row = treeData.NewRow();
row["ORG_ID"] = dict["ORG_ID"];
row["ORG_NAME"] = dict["ORG_NAME"];
row["SUPER_ORG_ID"] = dict["SUPER_ORG_ID"];
row["ORG_TYPE_ID"] = dict["ORG_TYPE_ID"];
treeData.Rows.Add(row);
}
/*
foreach (DataRow row in treeData.Rows)
{
log.Debug(row["ORG_ID"].ToString() + " | " + row["ORG_NAME"].ToString() + " | " + row["SUPER_ORG_ID"].ToString() + " | " + row["ORG_TYPE_ID"].ToString());
}
* */
}