C#拾遗(一)

在实际工作中用到的一些零碎的知识记录下来

1.拼接路径

有时需要调用路径，把某一个文件放在某处，拼接路径生成一个路径

放在执行目录下

string Path = Path.Combine(Application.StartupPath, @"XXX.XXX");

Application.StartupPath就是DEBUG目录下

2.TreeView添加树节点

TreeView是比较常用的控件

TreeNode Rootnode = new TreeNode();//声明一个根节点
treeView.Nodes.Add(Rootnode); //TreeView加载根节点
TreeNode[] Chlidnodes = new TreeNode
; //声明n的子节点
Chlidnodes
= new TreeNode();  生成一个新节点
Rootnode.Nodes.Add(Chlidnodes
); //加载

下面的代码只有一个TreeView控件的操作，其余的什么也没有，可以新建一个新的C#空工程，仅拖入一个TreeView控件测试与学习

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TreeViewAgain
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

//初始化节点，根节点为Root，子节点为Chlid1，Chlid2
private void Form1_Load(object sender, EventArgs e)
{
TreeNode Root = new TreeNode();
Root.Text = "Root";
treeView1.Nodes.Add(Root);

TreeNode[] ChlidNode = new TreeNode[2];
ChlidNode[0] = new TreeNode();
ChlidNode[0].Text = "Chlid1";
Root.Nodes.Add(ChlidNode[0]);

ChlidNode[1] = new TreeNode();
ChlidNode[1].Text = "Chlid2";
Root.Nodes.Add(ChlidNode[1]);
treeView1.ExpandAll();//展开
Root.Checked = true;
SetChlid(Root);
}

//子节点逻辑判断，点击父节点，子节点的逻辑判断很简单，子节点的勾选状态与父节点一致即可
private void SetChlid(TreeNode Node)
{
foreach (TreeNode child in Node.Nodes)
{
child.Checked = Node.Checked; <span style="white-space:pre">	</span>//子节点状态等于父节点状态，父节点勾选，子节点全部勾选，父节点取消勾选，子节点全部取消勾选
SetChlid(child);                //递归遍历子节点
}
}

//父节点逻辑判断,父节点逻辑判断略麻烦，先遍历所有子节点，如果至少有一个子节点勾选，则父节点勾选，子节点全部取消勾选，父节点取消勾选
private void SetParent(TreeNode Node)
{
if (Node.Parent != null)
{
if (Node.Checked)
{
Node.Parent.Checked = true;
return;
}
else
{
foreach (TreeNode Brother in Node.Parent.Nodes)
{
if (Brother.Checked == false)
continue;
else
return;
}
Node.Parent.Checked = false;
}
}
}

//CheckBox节点
private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
{
if (e.Action != TreeViewAction.Unknown)
{
SetChlid(e.Node);
SetParent(e.Node);
}
}

List<string> m_SubNode = new List<string>();             //存储所有子节点
List<string> m_SubCheckNode = new List<string>();        //存储所有勾选的子节点
List<string> m_SubUnCheckNode = new List<string>();      //<span style="font-family: Arial, Helvetica, sans-serif;">存储所有未勾选的子节点</span>

//存储所有子节点
private List<string> Savenode(TreeNode Node)
{
foreach (TreeNode Chlid in Node.Nodes)
{
m_SubNode.Add(Chlid.Text);
Savenode(Chlid);
}
return m_SubNode;
}

//存储未勾选子节点
private List<string> SaveUnchecknode(TreeNode Node)
{
foreach (TreeNode Chlid in Node.Nodes)
{
if (Chlid.Checked == false)
{
m_SubNode.Add(Chlid.Text);
Savenode(Chlid);
}
}
return m_SubUnCheckNode;
}

//存储勾选子节点
private List<string> Savechecknode(TreeNode Node)
{
foreach (TreeNode Chlid in Node.Nodes)
{
if (Chlid.Checked == true)
{
m_SubNode.Add(Chlid.Text);
Savenode(Chlid);
}
}
return m_SubCheckNode;
}

//点击节点
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
m_SubNode.Clear();
m_SubCheckNode.Clear();
m_SubUnCheckNode.Clear();
Savenode(e.Node);
Savechecknode(e.Node);
SaveUnchecknode(e.Node);
}
}
}