c# TextBox 查找替换模块

c# TextBox 查找替换模块

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        }