OrderedDictionary.IsReadOnly 属性
定义
重要
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获取指示 OrderedDictionary 集合是否为只读的值。
public:
property bool IsReadOnly { bool get(); };public bool IsReadOnly { get; }member this.IsReadOnly : boolPublic ReadOnly Property IsReadOnly As Boolean属性值
如果 OrderedDictionary 集合为只读，则为 true；否则为 false。 默认值为 false。
实现
示例
下面的代码示例演示了对集合的 OrderedDictionary 修改。 在此示例中， IsReadOnly 属性用于确定是否 OrderedDictionary 可以修改 。 此代码是可在 中查看的较大代码示例的一 OrderedDictionary部分。
// Modifying the OrderedDictionary
if (!myOrderedDictionary->IsReadOnly)
{
// Insert a new key to the beginning of the OrderedDictionary
myOrderedDictionary->Insert(0, "insertedKey1", "insertedValue1");
// Modify the value of the entry with the key "testKey2"
myOrderedDictionary["testKey2"] = "modifiedValue";
// Remove the last entry from the OrderedDictionary: "testKey3"
myOrderedDictionary->RemoveAt(myOrderedDictionary->Count - 1);
// Remove the "keyToDelete" entry, if it exists
if (myOrderedDictionary->Contains("keyToDelete"))
{
myOrderedDictionary->Remove("keyToDelete");
}
}
// Modifying the OrderedDictionary
if (!myOrderedDictionary.IsReadOnly)
{
// Insert a new key to the beginning of the OrderedDictionary
myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1");
// Modify the value of the entry with the key "testKey2"
myOrderedDictionary["testKey2"] = "modifiedValue";
// Remove the last entry from the OrderedDictionary: "testKey3"
myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1);
// Remove the "keyToDelete" entry, if it exists
if (myOrderedDictionary.Contains("keyToDelete"))
{
myOrderedDictionary.Remove("keyToDelete");
}
}
' Modifying the OrderedDictionary
If Not myOrderedDictionary.IsReadOnly Then
' Insert a new key to the beginning of the OrderedDictionary
myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1")
' Modify the value of the entry with the key "testKey2"
myOrderedDictionary("testKey2") = "modifiedValue"
' Remove the last entry from the OrderedDictionary: "testKey3"
myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1)
' Remove the "keyToDelete" entry, if it exists
If (myOrderedDictionary.Contains("keyToDelete")) Then
myOrderedDictionary.Remove("keyToDelete")
End If
End If
注解
在创建只读集合后，该集合不允许添加、移除或修改元素。
只读集合只是一个集合，其中包含阻止修改集合的包装器;因此，如果对基础集合进行了更改，只读集合将反映这些更改。
