如何有效地删除一部分字符串

Question

有一个像A = B＆C = D＆E = F的字符串，如何删除C = D部分并得到像A = B＆E = F的字符串？

Answer 1

Either just replace it away:

input.Replace("&C=D", "");

or use one of the solutions form your previous question, remove it from the data structure and join it back together.

Using my code:

var input = "A=B&C=D&E=F";
var output = input
                .Split(new string[] {"&"}, StringSplitOptions.RemoveEmptyEntries)
                .Select(s => s.Split('=', 2))
                .ToDictionary(d => d[0], d => d[1]);

output.Remove("C");
output.Select(kvp => kvp.Key + "=" + kvp.Value)
      .Aggregate("", (s, t) => s + t + "&").TrimRight("&");

Answer 2

using System.Web; // for HttpUtility

NameValueCollection values = HttpUtility.ParseQueryString("A=B&C=D&E=F");
values.Remove("C");
values.ToString();  // "A=B&E=F"

Answer 3

I think you need to give a clearer example to make sure it's something for the situation, but something like this should do that:

var testString = "A=B&C=D&E=F"
var stringArray = testString.Split('&');
stringArray.Remove("C=D");
var output = String.Join("&", stringArray);

Something like that should work, and should be pretty dynamic

Answer 4

你可以split（）和手动连接（取决于数据的样子）或者simly使用string.Replace（，string.empty）

Answer 5

Split it on the & separator, exclude the C=D part by some mechanism, then join the remaining two? The String class provides the methods you'd need for that, including splitting, joining and substring matching.

Answer 6

string xyz = "A=B&C=D&E=F";
string output = xyz.Replace("&C=D","");

Output: A=B&E=F