1

我需要 C# 逻辑来分析 XML 文件中的某些条件。逻辑应该能够评估条件并告诉我最终结果是真还是假：

示例：1：规则（A AND B AND C）在 XML 文件中表示如下：

   <Evaluate>       
        <!-- (A AND B AND C)-->
        <AND>                               
            <Condition Name="A" Operator="!=" Value="0"/>
            <Condition Name="B" Operator="!=" Value="0"/>
            <Condition Name="C" Operator="==" Value="17"/>
        </AND>                
   </Evaluate>

我知道这很简单，但以下是一些需要从 C# 代码评估的复杂规则：示例：2：

<Evaluate>
    <!-- (A AND B) OR C -->
    <OR>
        <Condition Name="C" Operator="==" Value="17"/>
        <AND>
            <Condition Name="A" Operator="!=" Value="0"/>
            <Condition Name="B" Operator="!=" Value="0"/>
        </AND>            
    </OR>                
</Evaluate>

示例：3：

<Evaluate>
    <!-- (A)  OR ((B AND C) OR D)-->
    <OR>
        <Condition Name="A" Operator="!=" Value="0"/>
        <OR>
            <Condition Name="D" Operator="!=" Value="0"/>
            <AND>
                <Condition Name="B" Operator="!=" Value="0"/>
                <Condition Name="C" Operator="!=" Value="0"/>                    
            </AND>
        </OR>
    </OR>               
</Evaluate>

示例：4：

<Evaluate>
    <!-- (A AND B)  OR ((C AND D) OR E)-->
    <OR>
        <AND>
            <Condition Name="A" Operator="!=" Value="0"/>
            <Condition Name="B" Operator="!=" Value="0"/>
        </AND>            
        <OR>
            <Condition Name="E" Operator="!=" Value="0"/>
            <AND>
                <Condition Name="C" Operator="!=" Value="0"/>
                <Condition Name="D" Operator="!=" Value="0"/>                    
            </AND>
        </OR>
    </OR>
</Evaluate>

向您解释 Xml 节点：

<Condition Name="D" Operator="!=" Value="0"/>

表示 (D != 0) 与否。

您的帮助将不胜感激。

4

2 回答 2

2

也许这样的事情会让你开始。

// warning, not tested
bool Evaluate(XmlNode node)
{
  // what kind of node is this? call one of the other functions
}

bool Condition(XmlNode node)
{
  // this is a condition node, evaluate it
}

bool And(XmlNode node)
{
  bool val = true;
  foreach (XmlNode child in node.ChildNodes)
  {
     val = val && Evaluate(child);
  }
  return val;
}

bool Or(XmlNode node)
{
  bool val = false;
  foreach (XmlNode child in node.ChildNodes)
  {
     val = val || Evaluate(child);
  }
  return val;
}
于 2012-07-07T14:16:27.167 回答
2

我为你做了一个样品

    static void Main(string[] args)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load("test.xml");
        var dict = new Dictionary<string, int>();
        dict["A"] = 1;
        dict["B"] = 0;
        dict["C"] = 17;
        var result = Evaluate(doc.FirstChild,dict);
    }

    static bool Evaluate(XmlNode node, IDictionary<string, int> dict)
    {
        switch (node.Name)
        {
            case "Evaluate":
                return Evaluate(node.FirstChild.NextSibling, dict); // Ignore first comment
            case "Condition":
                return Condition(node, dict);
            case "AND":
                return And(node, dict);
            case "OR":
                return Or(node, dict);
            default:
                throw new NotSupportedException();
        }
    }

    private static bool Or(XmlNode root, IDictionary<string, int> dict)
    {
        var result = false; // Starting with false, because It will be true when at least condition is true
        foreach (XmlNode node in root.ChildNodes)
        {
            result |= Evaluate(node, dict);
        }
        return result;
    }

    private static bool And(XmlNode root, IDictionary<string, int> dict)
    {
        var result = true;
        foreach (XmlNode node in root.ChildNodes)
        {
            result &= Evaluate(node, dict);
        }
        return result;
    }

    private static bool Condition(XmlNode node, IDictionary<string, int> dict)
    {
        var name = node.Attributes["Name"].Value;
        var value = node.Attributes["Value"].Value;
        var opt = node.Attributes["Operator"].Value;

        switch (opt)
        {
            case "==":
                return dict[name] == int.Parse(value);
            case "!=":
                return dict[name] != int.Parse(value);
            default:
                throw new NotSupportedException();
        }
    }
于 2012-07-08T02:28:49.033 回答