我在运行以下代码时 当窗体加载时，treeview1中却没有节点出现，是怎么回事呢？请大家帮忙看哈

   private void Form1_Load(object sender, EventArgs e)
        {
            System.Windows.Forms.TreeNode objTreeNode = new TreeNode();
            objTreeNode.Text = "新节点";
            objTreeNode.Tag = "新节点";
            objTreeNode.ImageIndex = 1;
            this.treeView1.Nodes.Add(objTreeNode);
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode objTreeNode = new TreeNode();
            objTreeNode.Text = "新节点";
            objTreeNode.Tag = "新节点";
            objTreeNode.ImageIndex = 1;
            this.treeView1.Nodes.Add(objTreeNode);
        }
楼主代码测试好用 但是如果把构造函数删除 treeview1中就没有节点出现了

楼主代码没有问题啊！

没得问题的
 public Form1()
        {
            InitializeComponent();
           System.Windows.Forms.TreeNode objTreeNode = new TreeNode();
            objTreeNode.Text = "新节点";
            objTreeNode.Tag = "新节点";
            objTreeNode.ImageIndex = 1;
            this.treeView1.Nodes.Add(objTreeNode);
        }
如果是这样的话就会出现

public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode objTreeNode = new TreeNode();
            objTreeNode.Text = "新节点";
            objTreeNode.Tag = "新节点";
            objTreeNode.ImageIndex = 1;
            this.treeView1.Nodes.Add(objTreeNode);
        }
按到这样我也测试过 恩 就是不行

还有这个东西int allNum = dirInfo.GetDirectories().Length + dirInfo.GetFiles("*.*").Length;
这个Length是什么呢？怎么理解呢？

你的启动窗体form1的load事件可能出现form_load1了，这样建议检查一下窗体.designer.cs文件，看看里面的form_load事件是怎么写的？！
int allNum = dirInfo.GetDirectories().Length + dirInfo.GetFiles("*.*").Length你可以看看MSDN的帮助，也可以看看下面：
https://bbs.bccn.net/thread-325650-1-1.html

谢了 哈 我看哈！！

你好c1_wangyf斑竹
.我的.designer.cs文件里只有这些东西 是不是有问题请看一下



namespace WindowsApplication9
{
    partial class Form1
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.treeView1 = new System.Windows.Forms.TreeView();
            this.SuspendLayout();
            //
            // treeView1
            //
            this.treeView1.Location = new System.Drawing.Point(85, 95);
            this.treeView1.Name = "treeView1";
            this.treeView1.Size = new System.Drawing.Size(302, 394);
            this.treeView1.TabIndex = 0;
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(1021, 591);
            this.Controls.Add(this.treeView1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.TreeView treeView1;
    }
}

应该是load事件出现了问题