asp.Net切り取り文字列コード

 
  
#region       
  
/// 
 
  
///       
  
/// 
 
  
///  
  
///  
  
///  
  
public static string leftx(string str_value, int str_len) 
  
{ 
  
int p_num = 0; 
  
int i; 
  
string New_Str_value = ""; 
  
if (str_value == "") 
  
{ 
  
New_Str_value = ""; 
  
} 
  
else 
  
{ 
  
int Len_Num = str_value.Length; 
  
for (i = 0; i <= Len_Num - 1; i++) 
  
{ 
  
if (i > Len_Num) break; 
  
char c = Convert.ToChar(str_value.Substring(i, 1)); 
  
if (((int)c > 255) || ((int)c < 0)) 
  
p_num = p_num + 2; 
  
else 
  
p_num = p_num + 1; 
  
if (p_num >= str_len) 
  
{ 
  
New_Str_value = str_value.Substring(0, i + 1); 
  
break; 
  
} 
  
else 
  
{ 
  
New_Str_value = str_value; 
  
} 
  
} 
  
} 
  
return New_Str_value; 
  
} 
  
#endregion