如何在富文本框中搜索文本
本文关键字：文本 搜索 | 更新日期: 2023-09-27 17:57:40
我有这个代码用于在Rtf框中查找文本并突出显示文本。
public Form1()
{
InitializeComponent();
}
public int currentPos = 1; // this is so currentPos does not loose its value
然后我有三个事件与类似的按钮相关
private void button5_Click(object sender, EventArgs e)
{
currentPos = 1;
if (!string.IsNullOrEmpty(this.textBox1.Text))
{
if (this.richTextBox1.Text.Contains(this.textBox1.Text) && currentPos < this.richTextBox1.Text.Length)
{
if (this.richTextBox1.Text.Substring(currentPos).Contains(this.textBox1.Text))
{
int start = this.richTextBox1.Text.Substring(currentPos).IndexOf(this.textBox1.Text);
this.richTextBox1.Select(start + currentPos, this.textBox1.Text.Length);
currentPos = start + currentPos + this.textBox1.Text.Length;
this.richTextBox1.Focus();
}
else
{
//restart the method after resetting the indicator
button5.Text = "Find Next";
button5_Click(button5, new EventArgs());
}
}
else
{
//restart the method after resetting the indicator
currentPos = currentPos + 1;
if (this.richTextBox1.Text.Contains(this.textBox1.Text))
{
button5_Click(button5, new EventArgs());
}
else
MessageBox.Show("Text not found");
}
}
}
// same as the previous code for button5_Click except currentPos
// does not start over, it keeps searching from where it found the
// last text
private void button6_Click(object sender, EventArgs e)
{
if (!string.IsNullOrEmpty(this.textBox1.Text))
{
if (this.richTextBox1.Text.Contains(this.textBox1.Text) && currentPos < this.richTextBox1.Text.Length)
{
if (this.richTextBox1.Text.Substring(currentPos).Contains(this.textBox1.Text))
{
int start = this.richTextBox1.Text.Substring(currentPos).IndexOf(this.textBox1.Text);
this.richTextBox1.Select(start + currentPos, this.textBox1.Text.Length);
currentPos = start + currentPos + this.textBox1.Text.Length;
this.richTextBox1.Focus();
}
else
{
DialogResult dialogResult = MessageBox.Show( "Larry's Journal has finished searching through the document. Do you want to continue the search from the top of the document?", "Message", MessageBoxButtons.YesNo);
if (dialogResult == DialogResult.Yes)
{
currentPos = 1;
button5_Click(button5, new EventArgs());
}
else if (dialogResult == DialogResult.No)
{
//do something else
}
}
}
else
{
//restart the method after resetting the indicator
currentPos = currentPos + 1;
if (this.richTextBox1.Text.Contains(this.textBox1.Text))
button1_Click(button5, new EventArgs());
else
MessageBox.Show("Text not found");
}
}
}
// This replaces the selected text in the richtextbox with the contents
// of texxtBox2 which is the replacement text.
private void button10_Click(object sender, EventArgs e)
{
textBox2.SelectAll();
textBox2.Copy();
richTextBox1.Paste();
}
第一个按钮5_Click用于在richtext框中查找文本。第二个按钮6_Click用于查找该文本的下一个实例。第三个按钮10_Click用于将找到的文本替换为其他文本如果你愿意的话。我编辑了这个问题，以表明我已经找到了如何做到这一点。这不是微软在其页面中谈论的如何使用richtextboxes的查找方法，但它是有效的。
我把这个贴在这里给任何觉得可以使用的程序员。只需复制并粘贴到你的程序中。除了程序中已有的任何其他控件外，您只需要3个按钮、两个文本框和一个richtextbox。
public static void Find(RichTextBox rtb, String word, Color color)
{
if (word == "")
{
return;
}
int s_start = rtb.SelectionStart, startIndex = 0, index;
while ((index = rtb.Text.IndexOf(word, startIndex)) != -1)
{
rtb.Select(index, word.Length);
rtb.SelectionColor = color;
startIndex = index + word.Length;
}
rtb.SelectionStart = 0;
rtb.SelectionLength = rtb.TextLength;
rtb.SelectionColor = Color.Black;
}
所以，基本上，这就是"查找"或"搜索"方法。但是，我还没有向你展示如何使用它：）这里：
private void button1_Click(object sender, EventArgs e)
{
Find(richtext, textBox1.Text, Color.Blue);
}
将RichTextBox替换为richtext，并将Color.Blue替换为您选择的Color。如果搜索到的文本不是来自TextBox，请将textBox1.Text替换为其他Control。
如果您最终不想要Color，则移除Color color、Color.Blue和rtb.SelectionColor = color;
这就是我对这件事的全部看法，我希望它能帮助你：）
使用此代码，您可以从RichTextBox设置的焦点开始位置选择要搜索的文本，此外还可以提供一些搜索条件，例如在NotePad for Windows 中找到的条件
private void button1_Click(object Sender, EventArgs e)
{
string s1 = textBox1.Text;
`int` a = richTextBox1.SelectionStart + 1;
if (radioButton1.Checked == true &&
(checkBox1.Checked == false && checkBox2.Checked == false))
{
`int` `startpos` = richTextBox1.Find(s1.ToCharArray(), a);
`int` `length` = s1.Length; a = `startpos`;
richTextBox1.Focus();
if (`startpos` > -1)
{
richTextBox1.Select(`startpos`, textBox1.Text.Length);
}
else
{
richTextBox1.SelectionStart = 0;
`MessageBox.Show`("Finish Find" + textBox1.Text, "Info", `MessageBoxButtons.OK`, `MessageBoxIcon.Information`);
}
}
else if (radioButton1.Checked == true && (checkBox1.Checked == true && checkBox2.Checked == true))
{
`int` position = richTextBox1.SelectionStart;
`int` b = richTextBox1.Text.LastIndexOf(s1, position - 1, `StringComparison.CurrentCulture`);
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
richTextBox1.SelectionStart = richTextBox1.Text.Length - 1;
}
}
else if (radioButton1.Checked == true && (checkBox1.Checked == true && checkBox2.Checked == false))
{
`int` position = richTextBox1.SelectionStart;
`int` b = richTextBox1.Text.LastIndexOf(s1, position - 1, `StringComparison.CurrentCulture`);
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
`MessageBox.Show`("Finish Find" + textBox1.Text, "Info", `MessageBoxButtons.OK`, `MessageBoxIcon.Information`);
}
}
else if (radioButton1.Checked == true && (checkBox1.Checked == false && checkBox2.Checked == true))
{
`int` position = richTextBox1.SelectionStart;
`int` b = richTextBox1.Text.LastIndexOf(s1, position - 1);
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
richTextBox1.SelectionStart = richTextBox1.Text.Length - 1;
}
` //int startpos = richTextBox1.Find(textBox1.Text, a + 1, RichTextBoxFinds.WholeWord);
//int leanth = s1.Length; a = startpos;
//richTextBox1.Focus();
//richTextBox1.Select(startpos, textBox1.Text.Length);`
}
else if (radioButton2.Checked == true && (checkBox1.Checked == true && checkBox2.Checked == true))
{
` int position = richTextBox1.SelectionStart;
int b = richTextBox1.Find(s1, position + 1, RichTextBoxFinds.MatchCase);`
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
richTextBox1.SelectionStart = richTextBox1.Text.Length - 1;
}
}
else if (radioButton2.Checked == true && (checkBox1.Checked == true && checkBox2.Checked == false))
{
` int position = richTextBox1.SelectionStart;
int b = richTextBox1.Find(s1, position + 1, RichTextBoxFinds.MatchCase);`
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
Message Box .Show("Finish Find" + textBox1.Text, "Info", Message Box Buttons .OK, Message Box Icon .Information);
}
}
else if (radioButton2.Checked == true && (checkBox1.Checked == false && checkBox2.Checked == true))
{
`int` position = richTextBox1.SelectionStart;
`int` b = richTextBox1.Find(s1, position + 1, Rich Text Box Finds . None);
if (b > -1)
{
richTextBox1.Focus();
richTextBox1.Select(b, s1.Length);
}
else
{
b = richTextBox1.Text.Length;
richTextBox1.SelectionStart = richTextBox1.Text.Length - 1;
}
}
}`