如何在字符串中添加逗号？ [英] How to add commas to a string?

问题描述

我想输出我的字符串如下：



字，字，字



目前，我无法用逗号分隔字符串。请告知我可能出错的地方 - 谢谢。



我尝试了什么：

 SqlDataReader reader = command.ExecuteReader（）; 
  while （reader.Read（））
 {
 
 
  string  content =（reader.GetString（ 0 ））; 
 
 result =结果+ 字符串 .Join（ ，，content）; 
 
 
  //  返回结果;  
} 
} 
 返回结果; 
} 

解决方案

参见String.Join Method（System） [ ^ ]。

String.Join需要多个第二个参数的某种形式的字符串，所以你需要将所有结果读入某种字符串列表然后将其传递给String.Join

 List< string> contentResults =  new  List< string>（）; 
 
 SqlDataReader reader = command.ExecuteReader（）; 
 
  while （reader.Read（））
 {
 contentResults.Add（reader.GetString（ 0 ））; 
} 
 
 result =  string  .Join（ ，，contentResult）; 
 < /   string  >  < /   string  >  

除了上述2解决方案之外，还有另外一种添加逗号的方法

 StringBuilder result =  new  StringBuilder（）; 
  while （reader.Read（））
 {
  string  content =（reader.GetString（ 0 ））; 
 result.Append（content +  ，）; ; 
} 
  return  result.ToString（）。TrimEnd（' ，）; 

I would like to output my string as following:

Word, word, word

Currently, I am unable split the string up with the commas. Please advise as to where I may be going wrong – thank you.

What I have tried:

SqlDataReader reader = command.ExecuteReader();
                    while (reader.Read())
                    {


                        string content = (reader.GetString(0));

                        result = result + string.Join(",", content);


                        //return result;
                    }
                }
                return result;
            }

解决方案

See String.Join Method (System)[^].

String.Join takes multiple strings in some form for the second argument, so you need to read all your results into a string list of some sort and then pass that in once to String.Join

List<string> contentResults = new List<string>();

SqlDataReader reader = command.ExecuteReader();

while (reader.Read())
{
    contentResults.Add(reader.GetString(0));
}

result = string.Join(", ", contentResult);
</string></string>

In addition to above 2 solution, here is the another way of adding comma's

StringBuilder result = new StringBuilder();
 while (reader.Read())
        {
            string content = (reader.GetString(0));
            result.Append(content + ","); ;
        }
        return result.ToString().TrimEnd(',');

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