回答編集履歴
1
見直しキャンペーン中
answer
CHANGED
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@@ -1,57 +1,57 @@
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古い行の削除にも需要はあると思いますので回答しておきます。
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[c# - Delete a specific line in a .NET RichTextBox - Stack Overflow](https://stackoverflow.com/questions/1329347/delete-a-specific-line-in-a-net-richtextbox/20983817#20983817)
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で、書式を維持したままの行削除を確認できました。
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```
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using System;
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using System.Drawing;
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using System.Linq;
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using System.Windows.Forms;
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namespace Questions281426
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{
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public partial class Form1 : Form
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{
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private Timer timer1;
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private RichTextBox richTextBox1;
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private int c;
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public Form1()
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{
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InitializeComponent();
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timer1 = new Timer
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{
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Enabled = true,
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Interval = 1000,
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};
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timer1.Tick += Timer1_Tick;
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richTextBox1 = new RichTextBox
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{
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Dock = DockStyle.Fill,
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};
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Controls.Add(richTextBox1);
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}
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private void Timer1_Tick(object sender, EventArgs e)
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{
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// なんか追加
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richTextBox1.SelectionStart = richTextBox1.TextLength;
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richTextBox1.SelectionLength = 0;
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richTextBox1.SelectionColor = ++c % 2 == 0 ? Color.Red : Color.Blue;
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richTextBox1.AppendText($"あああああ{c}\n");
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// 10行以上あったら先頭から削除
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while(10 < richTextBox1.Lines.Count())
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{
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//[c# - Delete a specific line in a .NET RichTextBox - Stack Overflow](https://stackoverflow.com/questions/1329347/delete-a-specific-line-in-a-net-richtextbox/20983817#20983817)
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richTextBox1.SelectionStart = richTextBox1.GetFirstCharIndexFromLine(0);
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richTextBox1.SelectionLength = richTextBox1.Lines[0].Length + 1;
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richTextBox1.SelectedText = string.Empty;
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}
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}
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}
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}
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1
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+
古い行の削除にも需要はあると思いますので回答しておきます。
|
|
2
|
+
|
|
3
|
+
[c# - Delete a specific line in a .NET RichTextBox - Stack Overflow](https://stackoverflow.com/questions/1329347/delete-a-specific-line-in-a-net-richtextbox/20983817#20983817)
|
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4
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+
で、書式を維持したままの行削除を確認できました。
|
|
5
|
+
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6
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+
```cs
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7
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+
using System;
|
|
8
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+
using System.Drawing;
|
|
9
|
+
using System.Linq;
|
|
10
|
+
using System.Windows.Forms;
|
|
11
|
+
|
|
12
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+
namespace Questions281426
|
|
13
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+
{
|
|
14
|
+
public partial class Form1 : Form
|
|
15
|
+
{
|
|
16
|
+
private Timer timer1;
|
|
17
|
+
private RichTextBox richTextBox1;
|
|
18
|
+
private int c;
|
|
19
|
+
|
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20
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+
public Form1()
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21
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+
{
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22
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InitializeComponent();
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23
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+
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24
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timer1 = new Timer
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25
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+
{
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26
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Enabled = true,
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27
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Interval = 1000,
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28
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};
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29
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timer1.Tick += Timer1_Tick;
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30
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+
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31
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richTextBox1 = new RichTextBox
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32
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{
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33
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Dock = DockStyle.Fill,
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34
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};
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35
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Controls.Add(richTextBox1);
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36
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}
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37
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+
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38
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private void Timer1_Tick(object sender, EventArgs e)
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39
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{
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40
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+
// なんか追加
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41
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richTextBox1.SelectionStart = richTextBox1.TextLength;
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42
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richTextBox1.SelectionLength = 0;
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43
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richTextBox1.SelectionColor = ++c % 2 == 0 ? Color.Red : Color.Blue;
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44
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richTextBox1.AppendText($"あああああ{c}\n");
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45
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+
|
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46
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+
// 10行以上あったら先頭から削除
|
|
47
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+
while(10 < richTextBox1.Lines.Count())
|
|
48
|
+
{
|
|
49
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+
//[c# - Delete a specific line in a .NET RichTextBox - Stack Overflow](https://stackoverflow.com/questions/1329347/delete-a-specific-line-in-a-net-richtextbox/20983817#20983817)
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50
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richTextBox1.SelectionStart = richTextBox1.GetFirstCharIndexFromLine(0);
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51
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richTextBox1.SelectionLength = richTextBox1.Lines[0].Length + 1;
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52
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richTextBox1.SelectedText = string.Empty;
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53
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}
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54
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}
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55
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}
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56
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}
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57
57
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```
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