如何在C＃

Question

为什么以下引发编译错误[] cannot be applied to object.（德语粗略翻译）？

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
}

我希望entry.Value是一个对象数组，但显然编译器认为它只是一个对象。这有什么不对？

Answer 1

错误即将发生，因为DictionaryEntry没有数组作为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; }
    }

修改

要使它工作，你必须施展它。使用以下代码

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