C#处理数组Lenght相同但整体长度不同原因

         public int GetSeparateSubstring(string str) 
         { 
             string tempstr = str; 
             int count =  0; 
             int temp =  0; 
             for ( int i =  0; i < tempstr.length; i++) 
            { 
                 string char = tempstr.substring(i,  1); 
                 int bytecount = Encoding.Default.GetByteCount(char); 

                 if (bytecount ==  1) 
                { 
                    temp++; 
                     if (temp ==  2) 
                    { 
                        count++; 
                        temp =  0; 
                    } 
                } 
                 else  if (bytecount >  1) 
                { 
                    count++; 
                } 
            } 
             return count;
         } 

测试结果：

string str = "测试1122";
MessageBox.Show("str.Length = " + str.Length.ToString() + "-------" + "GetSeparateSubString = " + GetSeparateSubString(str).ToString());

输入结果：

str.Length =  6
GetSeparateSubString = 4