回答編集履歴
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見直しキャンペーン中
answer
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> コンボボックスをパネルに追加する際、定数にパネル名を入れ、それを引数として受け取り、追加するパネルを判別したいのですがうまくいきません。
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やりたいこととコードがあっていないように感じます。
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コンボボックスを`panel1`・`panel2`どちらに入れるか選びたいということだと思いますが、`panel1`・`panel2`は先にできていないとおかしくないですか？
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radianさんのように`Find`でもいいし、`Form`の子だとわかっているならインデクサも使えます。
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[Control.ControlCollection.Find(String, Boolean) メソッド (System.Windows.Forms) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.forms.control.controlcollection.find)
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[Control.ControlCollection.Item[] プロパティ (System.Windows.Forms) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.forms.control.controlcollection.item#System_Windows_Forms_Control_ControlCollection_Item_System_String_)
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```
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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namespace Questions360326
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{
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class FormMain : Form
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{
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private const string p1 = "panel1";
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private const string p2 = "panel2";
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[STAThread]
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public static void Main()
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{
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Application.EnableVisualStyles();
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Application.SetCompatibleTextRenderingDefault(false);
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Application.Run(new FormMain());
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}
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FormMain()
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{
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Text = "Button Click Sample";
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ClientSize = new Size(600, 400);
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var btn1 = new Button { Location = new Point(50, 50), Text = "Add ComboBox", };
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btn1.Click += btn1_Click;
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var btn2 = new Button { Location = new Point(350, 50), Text = "Add ComboBox", };
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btn2.Click += btn2_Click;
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var panel1 = new Panel
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{
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Name = p1,
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Location = new Point(56, 72),
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Size = new Size(264, 152),
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BorderStyle = BorderStyle.Fixed3D,
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};
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var panel2 = new Panel
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{
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Name = p2,
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Location = new Point(356, 72),
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Size = new Size(264, 152),
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BorderStyle = BorderStyle.Fixed3D,
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};
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Controls.AddRange(new Control[] { btn1, btn2, panel1, panel2, });
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}
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private void btn1_Click(object sender, EventArgs e)
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{
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AddComboBox(p1);
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((Button)sender).Visible = false;
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}
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private void btn2_Click(object sender, EventArgs e)
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{
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AddComboBox(p2);
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((Button)sender).Visible = false;
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}
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private void AddComboBox(string pname)
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{
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var comboBox = new ComboBox();
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comboBox.Items.AddRange(new string[] { "A", "B", "C", "D", "E", });
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var panel = Controls[pname] as Panel; // インデクサ
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panel?.Controls.Add(comboBox);
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}
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}
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}
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1
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> コンボボックスをパネルに追加する際、定数にパネル名を入れ、それを引数として受け取り、追加するパネルを判別したいのですがうまくいきません。
|
|
2
|
+
|
|
3
|
+
やりたいこととコードがあっていないように感じます。
|
|
4
|
+
|
|
5
|
+
コンボボックスを`panel1`・`panel2`どちらに入れるか選びたいということだと思いますが、`panel1`・`panel2`は先にできていないとおかしくないですか？
|
|
6
|
+
|
|
7
|
+
radianさんのように`Find`でもいいし、`Form`の子だとわかっているならインデクサも使えます。
|
|
8
|
+
[Control.ControlCollection.Find(String, Boolean) メソッド (System.Windows.Forms) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.forms.control.controlcollection.find)
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9
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+
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10
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+
[Control.ControlCollection.Item[] プロパティ (System.Windows.Forms) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.forms.control.controlcollection.item#System_Windows_Forms_Control_ControlCollection_Item_System_String_)
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11
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12
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```cs
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13
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using System;
|
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14
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+
using System.Drawing;
|
|
15
|
+
using System.Windows.Forms;
|
|
16
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+
|
|
17
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+
namespace Questions360326
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18
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+
{
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19
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class FormMain : Form
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20
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+
{
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21
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private const string p1 = "panel1";
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22
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private const string p2 = "panel2";
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23
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+
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24
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[STAThread]
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25
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public static void Main()
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26
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{
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27
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Application.EnableVisualStyles();
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28
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Application.SetCompatibleTextRenderingDefault(false);
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Application.Run(new FormMain());
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}
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FormMain()
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{
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Text = "Button Click Sample";
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35
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ClientSize = new Size(600, 400);
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36
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+
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37
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var btn1 = new Button { Location = new Point(50, 50), Text = "Add ComboBox", };
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38
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btn1.Click += btn1_Click;
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39
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+
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40
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var btn2 = new Button { Location = new Point(350, 50), Text = "Add ComboBox", };
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41
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btn2.Click += btn2_Click;
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42
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+
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43
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var panel1 = new Panel
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44
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{
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45
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Name = p1,
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46
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+
Location = new Point(56, 72),
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47
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Size = new Size(264, 152),
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48
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BorderStyle = BorderStyle.Fixed3D,
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49
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};
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50
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51
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var panel2 = new Panel
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{
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Name = p2,
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54
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Location = new Point(356, 72),
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55
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Size = new Size(264, 152),
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56
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BorderStyle = BorderStyle.Fixed3D,
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};
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Controls.AddRange(new Control[] { btn1, btn2, panel1, panel2, });
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}
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private void btn1_Click(object sender, EventArgs e)
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{
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AddComboBox(p1);
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((Button)sender).Visible = false;
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}
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private void btn2_Click(object sender, EventArgs e)
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{
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AddComboBox(p2);
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((Button)sender).Visible = false;
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}
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private void AddComboBox(string pname)
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{
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var comboBox = new ComboBox();
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comboBox.Items.AddRange(new string[] { "A", "B", "C", "D", "E", });
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77
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+
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var panel = Controls[pname] as Panel; // インデクサ
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panel?.Controls.Add(comboBox);
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}
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}
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}
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83
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```
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