// 读入数据按钮
private void button2_Click(object sender, EventArgs e)
{
openFileDialog1.InitialDirectory = openPath;
openFileDialog1.RestoreDirectory = true;
openFileDialog1.FileName = "EX1_Order.csv";
openFileDialog1.CheckFileExists = true;
openFileDialog1.CheckPathExists = true;
openFileDialog1.Multiselect = false;
if (openFileDialog1.ShowDialog() == DialogResult.OK && File.Exists(openFileDialog1.FileName.ToString()))
{
openPath = openFileDialog1.FileName.ToString();
Apriori.SetData(openPath);
textBox.AppendText("成功从\"" + openPath + "\"读入数据。" + Environment.NewLine);
GenFreqBtn.Enabled = true;
Gen2FreqBtn.Enabled = true;
minsup.Enabled = true;
ShowFreqBtn.Enabled = false;
ShowRuleBtn.Enabled = false;
IntRecBtn.Enabled = false;
minint.Enabled = false;
recnum.Enabled = false;
productid.Enabled = false;
}
else
{
textBox.AppendText("请检查文件是否存在！" + Environment.NewLine);
}
}
// 生成数据按钮
private void button1_Click_1(object sender, EventArgs e)
{
if (int.TryParse(minuid.Text, out int a) &&
int.TryParse(maxuid.Text, out int b) &&
int.TryParse(minpid.Text, out int c) &&
int.TryParse(maxpid.Text, out int d) &&
int.TryParse(dataAmount.Text, out int h))
{
folderBrowserDialog1.SelectedPath = "C:\\Users\\13614\\OneDrive\\4\\电子商务\\实验";
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
string path = folderBrowserDialog1.SelectedPath;
Apriori.GenData(a, b, c, d, h, path);
textBox.AppendText("成功在\"" + path + "\"生成EX1_Order.csv文件和EX1_ProductInfo.csv文件。" + Environment.NewLine);
}
}
else
{
textBox.AppendText("请检查数据输入是否有误！" + Environment.NewLine);
}
ShowFreqBtn.Enabled = false;
ShowRuleBtn.Enabled = false;
IntRecBtn.Enabled = false;
GenFreqBtn.Enabled = false;
Gen2FreqBtn.Enabled = false;
}
private Apriori GetNextItemset()
{
Apriori retObj = new Apriori(K + 1);
retObj.GetCandidateSet(this); // this扩展到retObj的候选项集
retObj.CalSupCount();
return(retObj);
}
public Rule(double minSup, double minInt, int untilWhichSet)
{
outResult.pid = new List <int>();
outResult.pInfo = new List <List <string> >();
outResult.interest = new List <double>();
outResult.header = new List <string>();
minInterest = minInt;
Apriori.minSupPer = minSup;
allSets = Apriori.GetAllSets(allSets, untilWhichSet);
}
static public List <Apriori> GetAllSets(List <Apriori> allSets, int untilWhichSet)
{
Apriori set = new Apriori(1);
set.GetFirstItemset();
while (set.freqSet.freqSet.Count > 0 && allSets.Count < untilWhichSet)
{
allSets.Add(set);
set = set.GetNextItemset();
}
return(allSets);
}
private void GetCandidateSet(Apriori SrcSet)
{
// 组合得到K+1集
// 组合方法是两个项0~k-2的元素相等的话，那么就能产生新项{0~k-2，第一项k-1，第二项k-1}
// 找出频繁项集内的两个项尝试组合
for (int i = 0; i < SrcSet.freqSet.freqSet.Count; ++i)
{
for (int j = i + 1; j < SrcSet.freqSet.freqSet.Count; ++j)
{
// 对于每个频繁项集内的元素
for (int k = 0; k < SrcSet.K; ++k)
{
// 如果两个项第k个元素相等
if (SrcSet.freqSet.freqSet[i][k] != SrcSet.freqSet.freqSet[j][k])
{
// 如果k不是最后一个，直接跳过
if (k != SrcSet.K - 1)
{
break;
}
else
{
// 组合的结果unit
List <int> unit = new List <int>();
// 组合生成候选项集的项
for (int g = 0; g < SrcSet.K + 1; ++g)
{
if (g != SrcSet.K)
{
unit.Add(SrcSet.freqSet.freqSet[i][g]);
}
else
{
unit.Add(SrcSet.freqSet.freqSet[j][g - 1]);
}
}
if (!SrcSet.IsInFreq(unit))
{
freqSet.freqSet.Add(unit);
freqSet.supCount.Add(0);
}
}
}
}
}
}
}
