有
大小写匹配和
向上搜索的功能作为参数传进去
类里面的成员变量有：
private TextBox tb;
private int findCount = 0;
private int curFindIndex = 0;
//为替换做准备
private int curFindLength = 0;
//为替换做准备 private string findContext;
private string searchText;
1
private void FindText(TextBox tb, String findContext, ref int findCount, int CurIndex, bool ingnoreCase, bool IsUp)
2
{
3
if (IsUp)
4
{
5 String LeftText = tb.Text.Substring(CurIndex);
6 int searchLength = tb.Text.Length - LeftText.Length - tb.SelectionLength;
7 searchText = tb.Text.Substring(0, searchLength);
8
}
9 else
10 {
11 searchText = tb.Text.Substring(CurIndex);
12 }
13
14 if (ingnoreCase)
15 {
16 searchText = searchText.ToUpper();
17 findContext = findContext.ToUpper();
18 }
19 int index = 0;
20 if (IsUp)
21 {
22 index = searchText.LastIndexOf(findContext);
23 }
24 else
25 {
26 index = searchText.IndexOf(findContext);
27 }
28
29 if (index != -1)
30 {
31 findCount += 1;
32 if(IsUp)
33 {
34 tb.SelectionStart = index;
35 }
36 else
37 {
38 tb.SelectionStart = index + CurIndex;
39 }
40
41 tb.SelectionLength = findContext.Length;
42 tb.Focus();
43 curFindIndex = tb.SelectionStart;
44 curFindLength = tb.SelectionLength;
45 }
46 else
47 {
48 if (findCount == 0)
49 {
50 MessageBox.Show("未找到以下指示文本", "济南网通");
51 }
52 else
53 {
54 MessageBox.Show("查找到了尽头", "济南网通");
55 }
56 }
57
}
1 private void btnFind_Click(object sender, EventArgs e)
2 {
3 bool IsUp = this.cbUp.Checked;
4 bool IgnoreCase = !this.cbBig.Checked;
5 FindText(tb, txtFind.Text, ref findCount, tb.SelectionStart + tb.SelectionLength, IgnoreCase,IsUp);
6
7 }
8
1
2 private void btnReplace_Click(object sender, EventArgs e)
3 {
4 if (curFindLength > 0)
5 {
6 string strTmp = tb.Text.Remove(curFindIndex, curFindLength);
7 tb.Text = strTmp.Insert(curFindIndex, txtReplace.Text);
8 curFindLength = 0;
9 }
10 }
1 private void btnReplaceAll_Click(object sender, EventArgs e)
2 {
3 if (cbBig.Checked)
4 {
5 tb.Text = tb.Text.Replace(txtFind.Text, txtReplace.Text);
6 }
7 else
8 {
9 string str1 = txtFind.Text.ToLower();
10 string str2 = txtFind.Text.ToUpper();
11 tb.Text = tb.Text.Replace(str1, txtReplace.Text);
12 tb.Text = tb.Text.Replace(str2, txtReplace.Text);
13 }
14
15 }
1 private void txtFind_TextChanged(object sender, EventArgs e)
2 {
3 findContext = txtFind.Text;
4 if (findContext != null && findContext.Length > 0)
5 {
6 btnFind.Enabled = true;
7 btnReplace.Enabled = true;
8 btnReplaceAll.Enabled = true;
9 }
10 else
11 {
12 btnFind.Enabled = false;
13 btnReplace.Enabled = false;
14 btnReplaceAll.Enabled = false;
15 }
16 }
posted on 2008-09-19 10:35
天书 阅读(1307)
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