// 二分法
// 根据给出的Key得到Value
// return:
// -1 not found
public int Search(string strKeyParam,
out byte[] data)
{
data = null;
int k; // 区间左
int m; // 区间右
int j = -1; // 区间中
string strKey;
int nComp;
k = 0;
m = (int)this.Count - 1;
while (k <= m)
{
j = (k + m) / 2;
// 取得j位置的值
ObjectLineItem item = (ObjectLineItem)this[j];
strKey = item.ObjectItem.Key;
nComp = String.Compare(strKey, strKeyParam);
if (nComp == 0)
{
data = item.ObjectItem.Data;
break;
}
if (nComp > 0)
{ // strKeyParam较小
m = j - 1;
}
else
{
k = j + 1;
}
}
if (k > m)
{
return(-1); // not found
}
return(j);
}
// 获得排序后的非重复事项数
public long GetNoDupCount()
{
long lResult = 0;
this.Sort();
long lCount = this.Count;
string strPrevText = "";
for (long i = 0; i < lCount; i++)
{
ObjectLineItem line_item = (ObjectLineItem)this[i];
string strCurText = line_item.ObjectItem.Key;
if (strPrevText != strCurText)
{
lResult++;
strPrevText = strCurText;
}
}
return(lResult);
}
// 实现IComparable接口的CompareTo()方法,
// 根据ID比较两个对象的大小，以便排序，
// 按右对齐方式比较
// obj: An object to compare with this instance
// 返回值 A 32-bit signed integer that indicates the relative order of the comparands. The return value has these meanings:
// Less than zero: This instance is less than obj.
// Zero: This instance is equal to obj.
// Greater than zero: This instance is greater than obj.
// 异常: ArgumentException,obj is not the same type as this instance.
public override int CompareTo(object obj)
{
ObjectLineItem item = (ObjectLineItem)obj;
return(String.Compare(this.m_strLineKey, item.m_strLineKey));
}