Question

我的方案是我有一个多行文本框，其中包含多个值，例如下面：

firstvalue = secondvalue

anothervalue = thisvalue

我正在寻找一个快速简便的方案来翻转价值，例如下面：

secondvalue = firstvalue

thisvalue = anothervalue

你能帮忙吗？

由于

Answer 1

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 2

我猜您的多行文本框将始终包含您提到的格式的文本 - “firstvalue = secondvalue”和“anothervalue = thisvalue”。并且考虑到文本本身不包含任何“=”。之后，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 3

您也可以使用正则表达式组。向页面添加两个多行文本框和一个按钮。对于按钮的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();
}

它为您提供了一种处理您想要交换的左侧和右侧的好方法，作为处理子串和字符串长度的替代方法。

asp.net翻转字符串（交换字）之间的字符

3 个答案: