VS使用C#语言实现正规式到NFA到DFA再到MFA的过程其中利用string lines;string startSymbol;string endSymbol;string symbolSet;等数据保存NFA文件数据并在label3中显示初始状态集label4中显示终止状态集现在需要实现private void button7_Clickobject sender EventArgs e使用

首先，需要在button7_Click事件中进行子集构造算法的实现。具体实现步骤如下：

1. 创建一个List<HashSet>类型的变量statesList，用于存储DFA的状态集合。

2. 创建一个Dictionary<string, Dictionary<string, string>>类型的变量transitions，用于存储DFA的转移函数。

3. 将NFA的起始状态集合作为DFA的初始状态集合，并将其添加到statesList中。

4. 对于每个状态集合S in statesList，对于每个符号a in symbolSet，求出S通过a可以到达的状态集合T。

5. 如果T不在statesList中，则将T添加到statesList中，并在transitions中为S和a添加一条转移。

6. 最后，根据终止状态集合，确定DFA的终止状态集合。

7. 将DFA的状态集合、转移函数、初始状态集合和终止状态集合分别保存到string[] lines, Dictionary<string, Dictionary<string, string>> dfaTransitions, HashSet dfaStartStates和HashSet dfaEndStates中。

8. 根据dfaTransitions生成只有起始状态、接受符号、到达状态三列的DFA文件，并将其显示在listview2中。

9. 在label5中显示DFA的初始状态集，label7中显示DFA的终止状态集。

下面是完整的代码实现：

private void button7_Click(object sender, EventArgs e) { // 子集构造算法实现 List<HashSet> statesList = new List<HashSet>(); Dictionary<string, Dictionary<string, string>> transitions = new Dictionary<string, Dictionary<string, string>>(); HashSet startStates = new HashSet(); HashSet endStates = new HashSet(); HashSet currentStates = new HashSet(); startStates.Add(startSymbol); currentStates.Add(startSymbol); statesList.Add(currentStates); while (currentStates.Count > 0) { HashSet nextStates = new HashSet(); foreach (string state in currentStates) { if (endSymbol.Contains(state)) { endStates.Add(string.Join(",", currentStates)); break; } } foreach (string symbol in symbolSet) { Dictionary<string, string> transition = new Dictionary<string, string>(); foreach (string state in currentStates) { if (nfaTransitions.ContainsKey(state) && nfaTransitions[state].ContainsKey(symbol)) { HashSet toStates = nfaTransitions[state][symbol]; foreach (string toState in toStates) { transition.Add(toState, toState); nextStates.Add(toState); } } } if (transition.Count > 0) { string fromState = string.Join(",", currentStates); string toState = string.Join(",", transition.Keys); if (!statesList.Contains(transition.Keys)) { statesList.Add(transition.Keys); } if (!transitions.ContainsKey(fromState)) { transitions.Add(fromState, new Dictionary<string, string>()); } transitions[fromState].Add(symbol, toState); } } currentStates = nextStates; }

// 保存DFA数据并显示结果
string[] lines = new string[statesList.Count + transitions.Count + 2];
lines[0] = "States: " + string.Join(",", statesList.Select(s => string.Join(",", s)));
lines[1] = "Alphabet: " + string.Join(",", symbolSet);
int i = 2;
foreach (var transition in transitions)
{
    foreach (var symbol in transition.Value)
    {
        lines[i++] = string.Format("{0},{1},{2}", transition.Key, symbol.Key, symbol.Value);
    }
}
Dictionary<string, Dictionary<string, string>> dfaTransitions = new Dictionary<string, Dictionary<string, string>>();
foreach (var transition in transitions)
{
    string fromState = string.Join(",", transition.Key.Split(',').OrderBy(s => s));
    dfaTransitions.Add(fromState, new Dictionary<string, string>());
    foreach (var symbol in transition.Value)
    {
        dfaTransitions[fromState].Add(symbol.Key, string.Join(",", symbol.Value.Split(',').OrderBy(s => s)));
    }
}
HashSet<string> dfaStartStates = new HashSet<string>();
dfaStartStates.Add(string.Join(",", startStates));
HashSet<string> dfaEndStates = new HashSet<string>();
foreach (var endState in endStates)
{
    dfaEndStates.Add(string.Join(",", endState.Split(',').OrderBy(s => s)));
}
DisplayDFA(lines, dfaTransitions, dfaStartStates, dfaEndStates);

}

private void DisplayDFA(string[] lines, Dictionary<string, Dictionary<string, string>> transitions, HashSet startStates, HashSet endStates) { // 在listview2中显示DFA文件数据 listview2.Clear(); listview2.Columns.Add("起始状态"); listview2.Columns.Add("接受符号"); listview2.Columns.Add("到达状态"); foreach (string line in lines) { string[] items = line.Split(','); if (items.Length == 3) { ListViewItem lvi = new ListViewItem(items); listview2.Items.Add(lvi); } }

// 在label5中显示DFA的初始状态集
label5.Text = string.Join(",", startStates);

// 在label7中显示DFA的终止状态集
label7.Text = string.Join(",", endStates);