回答編集履歴
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見直しキャンペーン中
test
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あまり意味は分かっていませんが、こちらがズバリな感じです。
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[c# - Display empty text when there are no items in ListView Windows forms - Stack Overflow](https://stackoverflow.com/questions/41076244/display-empty-text-when-there-are-no-items-in-listview-windows-forms)
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入れ替え手順
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1. `MyListView`クラスを`Form1`の下か別ファイル（MyListView.cs）に書く
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1. 一度実行（ビルド）
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1. デザイナで`listView1`を削除し、ツールボックスに新たに出た`MyListView`を追加（反映に少し時間がかかる場合あり）
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1. `EmptyText`に好きなメッセージをいれる
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1. `(Name)`が`myListView1`になっているので、`listView1`に変える
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以上
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```
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```cs
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using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Windows.Forms;
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namespace Questions341965
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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}
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private void Form1_Load(object sender, EventArgs e) { }
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private void button1_Click(object sender, EventArgs e)
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{
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listView1.Items.Clear();
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var random = new System.Random();
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if (random.Next(0, 2) == 0)
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{
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listView1.Items.Add("項目");
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}
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}
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}
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listView1.Items.Add("項目");
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}
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// [c# - Display empty text when there are no items in ListView Windows forms - Stack Overflow](https://stackoverflow.com/questions/41076244/display-empty-text-when-there-are-no-items-in-listview-windows-forms)
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public class MyListView : ListView
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{
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public MyListView()
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{
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EmptyText = "No data available.";
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}
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}
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// [c# - Display empty text when there are no items in ListView Windows forms - Stack Overflow](https://stackoverflow.com/questions/41076244/display-empty-text-when-there-are-no-items-in-listview-windows-forms)
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public class MyListView : ListView
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{
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public MyListView()
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{
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EmptyText = "No data available.";
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}
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[DefaultValue("No data available.")]
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public string EmptyText { get; set; }
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protected override void WndProc(ref Message m)
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{
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base.WndProc(ref m);
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if (m.Msg == 0xF)
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{
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if (Items.Count == 0)
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{
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using (var g = Graphics.FromHwnd(Handle))
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{
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//ど真ん中
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//TextRenderer.DrawText(g, EmptyText, Font, ClientRectangle, ForeColor);
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// 上部中央
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TextRenderer.DrawText(g, EmptyText, Font, ClientRectangle, ForeColor,
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TextFormatFlags.HorizontalCenter | TextFormatFlags.WordBreak);
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}
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}
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}
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}
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}
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}
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```
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