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C# code:

string Left(string str,int len)
{
if(str.Length < len)
throw new Exception("×Ö·û´®³¤¶È²»ÄÜÉÙÓÚ" + len);
else if(str.Length == len)
return str;
char[] cs = new char[len];
for(int i = 0; i < len; i++)
{
cs[i] = str[i];
}
return new string(cs);
}



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C# code:

string Left(string str,int len)
{
if(str.Length < len || len == 0)
throw new Exception("×Ö·û´®³¤¶È²»ÄÜÉÙÓÚ" + len);
else if(str.Length == len)
return str;
return str.Remove(len);
}




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C# codestring Left(string str,int len)
{if(str.Length< len|| len==0)
thrownew Exception("×Ö·û´®³¤¶È²»ÄÜÉÙÓÚ"+ len);
elseif(str.Length== len)
return str;
return str.Remove(len);
}


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