我正在嘗試在單擊復選框時添加組合框。我使用的代碼如下。就目前而言，我可以讓它在已經存在的組合框中移動，但它不會創建一個新的組合框。 private void checkBox1_CheckedChanged(object sender, EventArgs e) { // Determine the CheckState of the check box. if (checkBox1.CheckState == CheckState.Checked) { combo.Items.AddRange(new object[] { "Item 1", "Item 2", "Item 3", "Item 4", "item 5", "Item 6"}); combo.Location = new System.Drawing.Point(19, 123); combo.Name = "combo"; combo.Size = new System.Drawing.Size(121, 21); combo.TabIndex = 0; combo.SelectedIndexChanged += new System.EventHandler(this.combo_SelectedIndexChanged); combo.BringToFront(); this.AllowDrop = false; } } private void checkBox1_Click(object sender, System.EventArgs e) { switch (checkBox1.CheckState) { case CheckState.Checked: ComboBox combo = new ComboBox(); Controls.Add(combo); break; case CheckState.Unchecked: break; case CheckState.Indeterminate: break; } }
1 回答
慕婉清6462132
TA貢獻1804條經驗 獲得超2個贊
解決方法是注意要將語句放入哪個函數。組合框的設置（范圍，位置等）將在條件下的函數中。這些將與 和 一起，以防萬一它最終落后于某些東西。CheckChangedif checkedgroupbox.controls.add();combo.BringToFront();
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
// Determine the CheckState of the check box.
if (checkBox1.CheckState == CheckState.Checked)
{
groupBox1.Controls.Add(combo);
combo.Items.AddRange(new object[] {
"Item 1",
"Item 2",
"Item 3",
"Item 4",
"Item 5",
"Item 6"});
combo.Location = new System.Drawing.Point(19, 123);
combo.Name = "combo";
combo.Size = new System.Drawing.Size(121, 21);
combo.TabIndex = 0;
combo.SelectedIndexChanged += new System.EventHandler(this.combo_SelectedIndexChanged);
combo.BringToFront();
this.AllowDrop = false;
}
同時，在函數中，您必須實例化組合框并添加它。Click
private void checkBox1_Click(object sender, System.EventArgs e)
{
switch (checkBox1.CheckState)
{
case CheckState.Checked:
ComboBox combo = new ComboBox();
Controls.Add(combo);
break;
case CheckState.Unchecked:
break;
case CheckState.Indeterminate:
break;
}
}
如果您想在取消選中復選框后刪除組合框，只需添加
if (checkBox1.CheckState == CheckState.Unchecked)
{
groupBox1.Controls.Remove(combo);
Controls.Remove(combo);
combo.Items.Clear();
}
進入函數。確保放置，否則它會將組合框的新實例的范圍添加到舊實例中。private void checkBox1_CheckedChanged(object sender, EventArgs e)combo.items.Clear()
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