如何从数据库列文件路径创建树状视图 [英] How to make a treeview from a database column filepath

问题描述

我在数据库表中有一列，其中包含表中每个文件的文件路径.我该如何在c#中创建一个树状视图，以模仿数据库中的文件路径列.

I have a column in a database table which contains the filepath for each file in the table. How can I make a treeview in c# which will mimic the filepath column in my database.

这是示例文件路径列在该列中的样子:

Here is what a sample filepath column looks like in the column:

jsmith/project1/hello.cs
jsmith/project1/what.cs
jwilliams/project2/hello.cs

推荐答案

我举了一个小例子.我已经对其进行了测试，并且效果很好.

I've made a little example. I've test it and it works fine.

请注意，我制作了一个MyDataBase类来模拟您的数据库:

Note that I've made a class MyDataBase to simulate your database:

public void CreateTreeView()
{
    TreeView myTreeview = new TreeView();
    myTreeview.Dock = DockStyle.Fill;
    this.Controls.Add(myTreeview);

    foreach (string field in MyDataBase.FieldsInMyColumn())
    {
        string[] elements = field.Split('/');
        TreeNode parentNode = null;

        for (int i = 0; i < elements.Length - 1; ++i)
        {                                        
            if (parentNode == null)
            {
                bool exits = false;
                foreach (TreeNode node in myTreeview.Nodes)
                {
                    if (node.Text == elements[i])
                    {
                        exits = true;
                        parentNode = node;   
                    }
                }

                if (!exits)
                {
                    TreeNode childNode = new TreeNode(elements[i]);
                    myTreeview.Nodes.Add(childNode);
                    parentNode = childNode;
                }
            }
            else
            {
                bool exits = false;
                foreach (TreeNode node in parentNode.Nodes)
                {
                    if (node.Text == elements[i])
                    {
                        exits = true;
                        parentNode = node;
                    }
                }

                if (!exits)
                {
                    TreeNode childNode = new TreeNode(elements[i]);
                    parentNode.Nodes.Add(childNode);
                    parentNode = childNode;
                }
            }
        }

        if (parentNode != null)
        {
           parentNode.Nodes.Add(elements[elements.Length - 1]);
        }
    }         
}

编辑

在这里，我粘贴了我不需要的辅助代码，但这将帮助您理解我的代码，或者自己复制/粘贴并尝试一下.

Here I paste my auxiliar code, that you don´t need, but it will help you to understand my code, or to copy/paste and try it by yourself.

public static class MyDataBase
{
    private static List<string> fields = new List<string>();

    public static void AddField(string field)
    {
        fields.Add(field);
    }

    public static IList<string> FieldsInMyColumn()
    {
        return fields;
    }
}

form1中的构造函数

public Form1()
{

    InitializeComponent();

    MyDataBase.AddField("jsmith/project1/hello.cs");
    MyDataBase.AddField("jsmith/project1/what.cs");
    MyDataBase.AddField("jsmith/project2/hello.cs");

    CreateTreeView();
}

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