如何在C＃中替换现有字符串中的值 [英] How to replace values in existing string in C#

问题描述

嗨朋友们，



我想替换现有字符串中的值c＃



例如：OldString = A = 3; B = 2; C = 5，新值B = 6; C = 7;那么输出应该是A = 3; B = 6; C = 7;





请建议解决方案

解决方案

请参阅



C＃替换字符串示例 [ ^ ]



示例：

  string  first =   B = 2\" ; 
  string  final = first.Replace（  2，  6）; 

问候..：）

你可以传递你想要替换的变量中的值以及哪一个

  char  a; 
  char  b; 
 a = '  2'; 
 b = '  6'; 
  char  c; 
  char  d; 
 c = '  5'; 
 d = '  7'; 
 Newstr = OldString.Replace（a，b）.Replace（c，d）; 

如果我是你，我会这样做方式：

  string  oldString =   A = 3; B = 2; C = 5; 

分开每个部分：

  string  [] parts = oldString.Split（ ;）; 
  //  您将 
  //   parts [0] ==A = 3 
  //   parts [1] ==B = 2 
  //   parts [2] ==C = 5 

使用 Dictionary< string，int> 用于存储字母和值：

  var  dic =  new 字典< string，int>（）; 
  foreach （ string  part  in 部分）{
  string  [] sep = part.Split（  =）; 
 dic.Add（sep [ 0 ]， int  .Parse（sep [ 1 ]）; 
} 

将您需要的部件更换为根据您的要求

 dic [  B] =  6 ; 
 dic [ < span class =code-string> C] =  7 ; 

将所有内容重新组合起来

  string  [ ] newParts =  new   string  [parts.Length]; 
  int  i =  0 ; 
  foreach （ var  kvp  in  dic）{
  stri ng  val =  string  .Format（  {0} = {1}，kvp.Key，kvp.Value）; 
 newParts [i ++] = val; 
} 
  string  newString =  string  .Join（newParts， ;）; 

这应该让你接近你想要的。



希望这会有所帮助。问候。

Hi Friends,

I want to replace values in existing string in c#

For eg : OldString = A=3;B=2;C=5 and new value B=6;C=7; then output should be A=3;B=6;C=7;


Please suggest solution

解决方案

Refer this

C# Replace string examples[^]

Example:

string first="B=2";
string final=first.Replace("2","6");

Regards..:)

you can pass the values in variables which you want to replace and of which one

            char a;
            char b;
            a = '2';
            b = '6';
            char c;
            char d;
            c = '5';
            d = '7';
Newstr= OldString.Replace(a, b).Replace(c, d);

If I were you, I would do that this way :

string oldString = "A=3;B=2;C=5";

Separate each part :

string[] parts = oldString.Split(";");
// You will then have
// parts[0] == "A=3"
// parts[1] == "B=2"
// parts[2] == "C=5"

Use a Dictionary<string, int> to store letters and values :

var dic = new Dictionary<string, int>();
foreach (string part in parts) {
   string[] sep = part.Split("=");
   dic.Add(sep[0], int.Parse(sep[1]);
}

Replace the parts you need to as per your requirements

dic["B"] = 6;
dic["C"] = 7;

Put everything back together

string[] newParts = new string[parts.Length];
int i = 0;
foreach (var kvp in dic) {
   string val = string.Format("{0}={1}", kvp.Key, kvp.Value);
   newParts[i++] = val;
}
string newString = string.Join(newParts, ";");

That should get you near what you want.

Hope this helps. Regards.

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