TreeView----从数据库取数据构建TreeView树

最新推荐文章于 2021-01-30 11:27:07 发布

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最新推荐文章于 2021-01-30 11:27:07 发布

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文章标签：数据库

原文链接：http://www.cnblogs.com/shuming/archive/2011/01/20/1940628.html

本文介绍了一种使用递归方法构建TreeView的方法，适用于展示具有层级结构的数据，例如医院内部的组织架构。通过具体的C#代码示例展示了如何从简单的组织列表中生成复杂的树状结构。

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简介：医院有很多工作单位，"" --->医院 code 是2位(如 10，20等)代表是医院的子节点，code是4位(如 1012，1011)是 10的子节点，以此类推；用递归的方法用这些数据构建TreeView树。效果图如下：

代码如下：

构建TreeView的xaml

构建TreeView cs文件

namespace CreateTree
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();

//根结点
TreeOrgDict treeDict = new TreeOrgDict();
treeDict.OrgCode = "";
treeDict.OrgName = "医院单位";

List<OrgDict> orgList = GetOrgList(); //递归多次调用方法GetNodeList，所以要放在方法的外面作为参数

//获取根结点的子节点
treeDict.SubList = GetNodeList("", orgList, 0);

TreeViewItem newItem = new TreeViewItem() { Tag = treeDict, Header = treeDict.OrgName };
newItem.IsExpanded = true;
if (treeDict.SubList != null)
{
//递归赋值
SetTreeNodes(treeDict.SubList.ToList(), newItem);
}
this.tvOrg.Items.Add(newItem);

}

//递归算法组装树
public List<TreeOrgDict> GetNodeList(string orgcode, List<OrgDict> orgList,int num)
{

int loop = num + 2; //子结点code的位数
List<OrgDict> rootNoods = new List<OrgDict>();
List<TreeOrgDict> reList = new List<TreeOrgDict>();
if (orgcode == "")
{
//根结点
rootNoods = (from org in orgList
where org.OrgCode.Length == 2
select org).ToList();
}
else
{
//非根结点
rootNoods = (from org in orgList
where org.OrgCode.Length == loop &&
org.OrgCode.Substring(0, num).Equals(orgcode)
select org).ToList();
}

//递归出口
if (rootNoods.Count() == 0)
{
return null;
}
else
{
foreach (var node in rootNoods)
{
TreeOrgDict treedict = new TreeOrgDict();
treedict.OrgCode = node.OrgCode;
treedict.OrgName = node.OrgName;

treedict.SubList = GetNodeList(node.OrgCode, orgList, loop);

reList.Add(treedict);
}
}
return reList;

}

//递归给树赋值
public void SetTreeNodes(List<TreeOrgDict> treeSubList, TreeViewItem newItem)
{
foreach (var node in treeSubList)
{
TreeViewItem subItem = new TreeViewItem() { Tag = node, Header = node.OrgName };

if (node.SubList != null)
{
SetTreeNodes(node.SubList.ToList(), subItem);
}

newItem.Items.Add(subItem);
}
}

//获取单位的列表
public List<OrgDict> GetOrgList()
{
List<OrgDict> orgList = new List<OrgDict>();
OrgDict org10 = new OrgDict("10", "政治部");
OrgDict org1001 = new OrgDict("1001", "政治部办公室");
OrgDict org1002 = new OrgDict("1002", "组织处");
OrgDict org1003 = new OrgDict("1003", "干部处");
OrgDict org11 = new OrgDict("11", "内科临床部");
OrgDict org1101 = new OrgDict("1101", "内分泌科师干病室");
OrgDict org1102 = new OrgDict("1102", "门诊内窥镜室");
OrgDict org16 = new OrgDict("16", "临床部");
OrgDict org1601 = new OrgDict("1601", "南楼二科");
OrgDict org1602 = new OrgDict("1602", "南楼四科");
OrgDict org1603 = new OrgDict("1603", "南楼六科");
OrgDict org20 = new OrgDict("20", "院首长");
OrgDict org2010 = new OrgDict("2010", "院长办公室");
OrgDict org2012 = new OrgDict("2012", "副院长办公室");
OrgDict org2016 = new OrgDict("2016", "党委书记办公室");
OrgDict org2018 = new OrgDict("2018", "副党委书记办公室");

orgList.Add(org10);
orgList.Add(org1001);
orgList.Add(org1002);
orgList.Add(org1003);
orgList.Add(org11);
orgList.Add(org1101);
orgList.Add(org1102);
orgList.Add(org16);
orgList.Add(org1601);
orgList.Add(org1602);
orgList.Add(org1603);
orgList.Add(org20);
orgList.Add(org2010);
orgList.Add(org2012);
orgList.Add(org2016);
orgList.Add(org2018);

return orgList;
}
}

//单位类
public class OrgDict
{
//单位编号
private string orgcode;

public string OrgCode
{
get { return orgcode; }
set { orgcode = value; }
}

//单位名称
private string orgname;

public string OrgName
{
get { return orgname; }
set { orgname = value; }
}

//构造方法
public OrgDict(string code,string name)
{
this.orgcode = code;
this.orgname = name;
}
}

//单位结点类
public class TreeOrgDict
{
//单位编号
private string orgcode;

public string OrgCode
{
get { return orgcode; }
set { orgcode = value; }
}

//单位名称
private string orgname;

public string OrgName
{
get { return orgname; }
set { orgname = value; }
}

//字节点列表
private List<TreeOrgDict> subList;

public List<TreeOrgDict> SubList
{
get { return subList; }
set { subList = value; }
}
}

}

转载于:https://www.cnblogs.com/shuming/archive/2011/01/20/1940628.html