将字符串转换为小写 [英] converting string to lower case

问题描述

这是我的功能
如果字符串中有大写字母，请将其转换为小写字母

我该怎么办

私有字符串RemoveNon_Alphabets_id(string str)
{
StringBuilder sb = new StringBuilder();

for(int i = 0; i& lt; str.Length; i ++)
{

if((((char.IsLetter(str [i]))|| str [i] ==''-''))
{

sb.Append(str [i]);

}

}

返回sb.ToString(); ;
}


现在我要转换为小写的结果字符串

here is my function
if there is any upper case in a string convert it to lower case

how i have to do

private string RemoveNon_Alphabets_id(string str)
{
StringBuilder sb = new StringBuilder();

for (int i = 0; i < str.Length; i++)
{

if (((char.IsLetter(str[i])) || str[i] == ''-''))
{

sb.Append(str[i]);

}

}

return sb.ToString(); ;
}


now the resultant string i want to convert to lower case
where and how to do

推荐答案

return sb.ToString().ToLower(); 

像这样:

like this:

sb.ToString().ToLower();

http://msdn.microsoft.com/zh-CN /library/system.string.tolower(v=vs.71).aspx [

http://msdn.microsoft.com/en-us/library/system.string.tolower(v=vs.71).aspx[^]

用这个

Hi,
use this

private string RemoveNon_Alphabets_id(string str)
            {
                  StringBuilder sb = new StringBuilder();

                  for (int i = 0; i < str.Length; i++)
                  {

                        if (((char.IsLetter(str[i])) || str[i] == '-'))
                        {

                              sb.Append(str[i]);

                        }

                  }

                  return sb.ToString().ToLower();
            }

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