ListView clear() 阻止显示新内容

Question

以下代码在框架 4.7.2 中运行良好

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

    private void Form1_Load(object sender, EventArgs e)
    {
        listView1.View = View.List;
        listView1.Items.Clear();
        listView1.Items.Add("A");
        listView1.Items.Add("B");
        listView1.Items.Add("C");
    }
}

但是在 .Net Core 3 中，.clear() 的存在导致其他项目不显示。

[更新] 我应该包括以下内容

   private void InitializeComponent()
        {
            System.Windows.Forms.ListViewItem listViewItem4 = new System.Windows.Forms.ListViewItem("");
            this.listView1 = new System.Windows.Forms.ListView();
            this.Column1 = new System.Windows.Forms.ColumnHeader();
            this.richTextBox1 = new System.Windows.Forms.RichTextBox();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            // 
            // listView1
            // 
            this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
            this.Column1});
            this.listView1.FullRowSelect = true;
            this.listView1.GridLines = true;
            this.listView1.HideSelection = false;
            this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
            listViewItem4});
            this.listView1.Location = new System.Drawing.Point(4, 7);
            this.listView1.Name = "listView1";
            this.listView1.Size = new System.Drawing.Size(849, 316);
            this.listView1.TabIndex = 1;
            this.listView1.UseCompatibleStateImageBehavior = false;
            this.listView1.SelectedIndexChanged += new System.EventHandler(this.listView1_SelectedIndexChanged);
            // 
            // Column1
            // 
            this.Column1.Name = "Column1";
            this.Column1.Text = "Name";
            this.Column1.Width = 500;
            // 
            // richTextBox1
            // 
            this.richTextBox1.Location = new System.Drawing.Point(3, 329);
            this.richTextBox1.Name = "richTextBox1";
            this.richTextBox1.Size = new System.Drawing.Size(850, 265);
            this.richTextBox1.TabIndex = 3;
            this.richTextBox1.Text = "";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(3, 610);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(753, 23);
            this.textBox1.TabIndex = 4;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(778, 609);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(74, 22);
            this.button1.TabIndex = 5;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(865, 661);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.richTextBox1);
            this.Controls.Add(this.listView1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);

        }

       private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        { 
        // does nothing 
        }

Answer 1

我有

 listview1.View = View.Details

需要

 listview1.View = View.List

Answer 2

 private void Form1_Load(object sender, EventArgs e)
    {
        listView1.View = View.List;  <---- instead of this : listView1.View = View.Details;
        listView1.Items.Clear();
        listView1.Items.Add("A");
        listView1.Items.Add("B");
        listView1.Items.Add("C");
    }

来自ListView.View属性的官方文档：source

可能是您的快速拼写错误。 让我知道。