/// <summary>
/// 比较规则，先比较字符大小
/// 在比较长度
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public int Compare(StringDS s)
{
int len = (this.GetLength() <= s.GetLength()) ? this.GetLength() : s.GetLength();
int i = 0;
for (i = 0; i < len; i++)
{
if (this[i] != s[i])
{
break;
}
}//for
if (i < len)
{
if (this[i] < s[i])
{
return -1;
}
else if (this[i] > s[i])
{
return 1;
}
}
else if (this.GetLength() == s.GetLength())
{
return 0;
}
else if (this.GetLength() < s.GetLength())
{
return -1;
}
return 1;
}
public StringDS(StringDS s)
{
}
/// <summary>
/// 获取索引从0开始的len个字符串
/// </summary>
/// <param name="idx">索引从0开始</param>
/// <param name="len"></param>
/// <returns></returns>
public StringDS SubString(int idx, int len)
{
if (idx < 0 || idx > this.GetLength() - 1)
{
throw new IndexOutOfRangeException("索引超出范围。");
}//fun
if (len < 0 || len > this.GetLength() - idx)
{
throw new IndexOutOfRangeException("字串长度超出范围。");
}
StringDS s = new StringDS(len);
for (int i = 0; i < len; i++)
{
s[i]=this [idx +i];
}//for
return s;
}
/// <summary>
/// 在索引后插入字符串
/// </summary>
/// <param name="idx">从0开始</param>
/// <param name="s"></param>
/// <returns></returns>
public StringDS Insert(int idx, StringDS s)
{
if (idx < 0 || idx > this.GetLength() - 1)
{
throw new IndexOutOfRangeException("索引超出范围。");
}
int len = s.GetLength();
int len2 = this.GetLength() + len;
StringDS s1 = new StringDS( len2);
for (int i = 0; i <= idx; i++)
{
s1[i] = this[i];
}//for
for (int i = idx + 1; i < idx +len ; i++)
{
s1[i] = s[i - idx-1];
}//
for (int i = idx + len; i < len2; i++)
{
s1[i] = this[i - len+1];
}
return s1;
}
/// <summary>
/// 串定位
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public int IndexOf(StringDS s)
{
return 0;
}
/// <summary>
/// 连接串，将两个串合并成一个新串返回
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public StringDS Concat(StringDS s)
{
StringDS s1 = new StringDS(this.GetLength() + s.GetLength());
for (int i = 0; i < this.GetLength(); i++)
{
s1[i] = this[i];
}
for (int j = 0; j < s.GetLength(); j++)
{
s1[this.GetLength() + j] = s[j];
}//
return s1;
}
