平台:C# windows。 .Net 框架 3.5、4.0。 我有一些控件集，我想将其显示为 TreeView 。我已将控件集添加到 TreeView 中，如下所示:

Control control;

.................
.................   

Treeview1.Controls.Add(control);

它向我展示了类似面板的树状 View 中的控件。它没有显示任何层次结构或加号/减号。所以我无法折叠/伸展树(Splay Tree)节点。 请您建议我解决它的方法。

最佳答案

@Banketeshvar，您可以使用 Flowlayout 面板或 WPF Expander。

WPF 扩展器代码是:

<Window x:Class="WpfExpander.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid VerticalAlignment="Stretch" Margin="3,3,3,3">

    <Grid.RowDefinitions>
        <RowDefinition Height="0*" />
        <RowDefinition Height="85" />
        <RowDefinition Height="220" />
    </Grid.RowDefinitions>

    <Expander Grid.Row="1" Header="expander1" Name="expander1" IsExpanded="False">            
            <ListBox>
                <ListBoxItem Content="Unit 1"/>
                <ListBoxItem Content="Unit 2"/>
            </ListBox>           

  </Expander>
  <Expander Grid.Row="2" Header="expander2" Name="expander2" IsExpanded="False">
   <ListBox>
       <ListBoxItem Content="Unit 1"/>
       <ListBoxItem Content="Unit 2"/>
   </ListBox>
  </Expander>
</Grid>
</Window>

FlowLayout 面板的代码是:

public partial class Form1 : Form
{
    private bool _open;
    public Form1()
    {
        InitializeComponent();
        this.flowLayoutPanel1.ClientSize = new Size(this.panel1.ClientSize.Width,0);

    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (_open)
        {
            this.flowLayoutPanel1.ClientSize = new Size(this.panel1.ClientSize.Width,0);
            //this.ClientSize = new Size(this.panel1.ClientSize.Width, this.panel1.ClientSize.Height);                
            this.button1.Text = "+";
        }
        else
        {
            //this.ClientSize = new Size(this.panel1.ClientSize.Width, this.panel1.ClientSize.Height + this.flowLayoutPanel1.PreferredSize.Height);
             this.flowLayoutPanel1.ClientSize= new Size(this.panel1.ClientSize.Width, this.panel1.ClientSize.Height + this.flowLayoutPanel1.PreferredSize.Height);
            this.button1.Text = "-";
        }

        this._open = !this._open;
    }

    private void button5_Click(object sender, EventArgs e)
    {
        Button btn1=new Button();
        btn1.Text="aaaaaaaaaaaaaaaa";
        flowLayoutPanel1.FlowDirection = FlowDirection.TopDown;
        flowLayoutPanel1.Height += 100;
        flowLayoutPanel1.Controls.Add(btn1);

    }
  }
}



partial class Form1
 {
    /// <summary>
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Windows Form Designer generated code

    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.panel1 = new System.Windows.Forms.Panel();
        this.label1 = new System.Windows.Forms.Label();
        this.button1 = new System.Windows.Forms.Button();
        this.flowLayoutPanel1 = new System.Windows.Forms.FlowLayoutPanel();
        this.button5 = new System.Windows.Forms.Button();
        this.panel1.SuspendLayout();
        this.SuspendLayout();
        // 
        // panel1
        // 
        this.panel1.Controls.Add(this.label1);
        this.panel1.Controls.Add(this.button1);
        this.panel1.Location = new System.Drawing.Point(0, 0);
        this.panel1.Name = "panel1";
        this.panel1.Size = new System.Drawing.Size(200, 30);
        this.panel1.TabIndex = 0;
        // 
        // label1
        // 
        this.label1.AutoSize = true;
        this.label1.Location = new System.Drawing.Point(127, 9);
        this.label1.Name = "label1";
        this.label1.Size = new System.Drawing.Size(35, 13);
        this.label1.TabIndex = 1;
        this.label1.Text = "label1";
        // 
        // button1
        // 
        this.button1.Location = new System.Drawing.Point(4, 4);
        this.button1.Name = "button1";
        this.button1.Size = new System.Drawing.Size(75, 23);
        this.button1.TabIndex = 0;
        this.button1.Text = "button1";
        this.button1.UseVisualStyleBackColor = true;
        this.button1.Click += new System.EventHandler(this.button1_Click);
        // 
        // flowLayoutPanel1
        // 
        this.flowLayoutPanel1.BackColor = System.Drawing.Color.SandyBrown;
        this.flowLayoutPanel1.Location = new System.Drawing.Point(4, 36);
        this.flowLayoutPanel1.Name = "flowLayoutPanel1";
        this.flowLayoutPanel1.Size = new System.Drawing.Size(553, 289);
        this.flowLayoutPanel1.TabIndex = 1;
        // 
        // button5
        // 
        this.button5.Location = new System.Drawing.Point(38, 389);
        this.button5.Name = "button5";
        this.button5.Size = new System.Drawing.Size(75, 23);
        this.button5.TabIndex = 2;
        this.button5.Text = "Add Buttons";
        this.button5.UseVisualStyleBackColor = true;
        this.button5.Click += new System.EventHandler(this.button5_Click);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(840, 453);
        this.Controls.Add(this.button5);
        this.Controls.Add(this.flowLayoutPanel1);
        this.Controls.Add(this.panel1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.panel1.ResumeLayout(false);
        this.panel1.PerformLayout();
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.Panel panel1;
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.FlowLayoutPanel flowLayoutPanel1;
    private System.Windows.Forms.Button button5;
}

如果您不在运行时添加控件，那么您可以使用简单的面板控件而不是 FlowLayoutPanelControl。

您也可以使用普通面板控件来实现动态控件，但 FlowLayoutPanel 提供了一些附加属性。

关于c# - 具有折叠/展开功能的控件 TreeView ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19276784/