asp.net翻轉字符串（交換字符）字符

Question

我的場景是我有一個多行文本框與多個值例如如下：

firstvalue = secondvalue

anothervalue = thisvalue

我正在尋找一個快速簡便的場景，例如翻轉值如下：

secondvalue = firstvalue

thisvalue = anothervalue

你能幫忙嗎？

感謝

Answer 1

我猜測你的多行文本框會一直有文字這是你提到的格式 - 「firstvalue = secondvalue」和「anothervalue = thisvalue」。考慮到文本本身不包含任何「=」。之後，它只是字符串操作。

string multiline_text = textBox1.Text; 
string[] split = multiline_text.Split(new char[] { '\n' }); 

foreach (string a in split) 
{   
     int equal = a.IndexOf("="); 

     //result1 will now hold the first value of your string 
     string result1 = a.Substring(0, equal); 

     int result2_start = equal + 1; 
     int result2_end = a.Length - equal -1 ; 

     //result1 will now hold the second value of your string 
     string result2 = a.Substring(result2_start, result2_end); 

     //Concatenate both to get the reversed string 
     string result = result2 + " = " + result1; 

} 

Answer 2

protected void btnSubmit_Click(object sender, EventArgs e) 
{ 
    string[] content = txtContent.Text.Split('\n'); 

    string ret = ""; 
    foreach (string s in content) 
    { 
     string[] parts = s.Split('='); 
     if (parts.Count() == 2) 
     { 
      ret = ret + string.Format("{0} = {1}\n", parts[1].Trim(), parts[0].Trim()); 
     } 
    } 
    lblContentTransformed.Text = "<pre>" + ret + "</pre>"; 

} 

Answer 3

您也可以使用正則表達式組此。添加兩個多行文本框到頁面和一個按鈕。對於按鈕的onclick事件添加：

using System.Text.RegularExpressions; 
... 
protected void Button1_Click(object sender, EventArgs e) 
{ 
    StringBuilder sb = new StringBuilder(); 

    Regex regexObj = new Regex(@"(?<left>\w+)(\W+)(?<right>\w+)"); 
    Match matchResults = regexObj.Match(this.TextBox1.Text); 
    while (matchResults.Success) 
    { 
     string left = matchResults.Groups["left"].Value; 
     string right = matchResults.Groups["right"].Value; 
     sb.AppendFormat("{0} = {1}{2}", right, left, Environment.NewLine); 
     matchResults = matchResults.NextMatch(); 
    } 

    this.TextBox2.Text = sb.ToString(); 
} 

它給你一個很好的方式來處理左手和右手邊，你正在尋找交換，以替代與子和字符串長度工作。