如何访问对象数组作为C＃中的Hashvalue

Question

为什么下面的代码会引发编译错误[] cannot be applied to object.（德文粗略翻译）？

Hashtable entrys = new Hashtable(); 
string keyPath = "HKEY_CURRENT_USER\\Software\\Test"; 
string entryName = "testName"; 

entrys.Add(entryName, new object[]{256, RegistryValueKind.DWord}); // seems to work 

foreach(DictionaryEntry entry in entrys) 
{ 
    Registry.SetValue(keyPath, 
         (string)entry.Key, 
         entry.Value[0], // error here 
         entry.Value[1]); // and here 
} 

我预计entry.Value是对象的数组，但显然编译器认为它只是一个对象。这里有什么问题？

Answer 1

错误即将发生，因为DictionaryEntry没有将数组作为Value的属性。以下是DictionaryEntry的结构。您必须使用entry.Value代替entry.Value[0]

// Summary: 
    // Defines a dictionary key/value pair that can be set or retrieved. 
    [Serializable] 
    [ComVisible(true)] 
    public struct DictionaryEntry 
    {    
     public DictionaryEntry(object key, object value); 

     // Summary: 
     //  Gets or sets the key in the key/value pair. 
     // 
     // Returns: 
     //  The key in the key/value pair. 
     public object Key { get; set; } 
     // 
     // Summary: 
     //  Gets or sets the value in the key/value pair. 
     // 
     // Returns: 
     //  The value in the key/value pair. 
     public object Value { get; set; } 
    } 

编辑

为了使它工作，你要投它。使用以下代码

Registry.SetValue(keyPath, 
        (string)entry.Key, 
        ((object[])(entry.Value))[0]);