IDictionary.Add(Object, Object) IDictionary.Add(Object, Object) IDictionary.Add(Object, Object) IDictionary.Add(Object, Object) Method

定義

將隨附有索引鍵和值的項目加入至 IDictionary 物件。Adds an element with the provided key and value to the IDictionary object.

public:
 void Add(System::Object ^ key, System::Object ^ value);
public void Add (object key, object value);
abstract member Add : obj * obj -> unit
Public Sub Add (key As Object, value As Object)

參數

key
Object Object Object Object

Object,用做要加入之項目的索引鍵。The Object to use as the key of the element to add.

value
Object Object Object Object

Object,用做要加入之項目的值。The Object to use as the value of the element to add.

例外狀況

具有相同索引鍵的項目已經存在 IDictionary 物件中。An element with the same key already exists in the IDictionary object.

IDictionary 是唯讀的。The IDictionary is read-only.

-或--or- IDictionary 具有固定的大小。The IDictionary has a fixed size.

範例

下列程式碼範例示範如何執行Add方法。The following code example demonstrates how to implement the Add method. 這個程式碼範例是針對IDictionary類別提供之較大範例的一部分。This code example is part of a larger example provided for the IDictionary class.

public:
    virtual void Add(Object^ key, Object^ value)
    {
        // Add the new key/value pair even if this key already exists
        // in the dictionary.
        if (itemsInUse == items->Length)
        {
            throw gcnew InvalidOperationException
                ("The dictionary cannot hold any more items.");
        }
        items[itemsInUse++] = gcnew DictionaryEntry(key, value);
    }
public void Add(object key, object value) 
{
    // Add the new key/value pair even if this key already exists in the dictionary.
    if (ItemsInUse == items.Length)
        throw new InvalidOperationException("The dictionary cannot hold any more items.");
    items[ItemsInUse++] = new DictionaryEntry(key, value);
}
Public Sub Add(ByVal key As Object, ByVal value As Object) Implements IDictionary.Add

    ' Add the new key/value pair even if this key already exists in the dictionary.
    If ItemsInUse = items.Length Then
        Throw New InvalidOperationException("The dictionary cannot hold any more items.")
    End If
    items(ItemsInUse) = New DictionaryEntry(key, value)
    ItemsInUse = ItemsInUse + 1
End Sub

備註

您也可以藉由Item[Object]設定不存在於字典中之索引鍵的值 (例如), myCollection["myNonexistentKey"] = myValue來使用屬性來加入新的元素。You can also use the Item[Object] property to add new elements by setting the value of a key that does not exist in the dictionary (for example, myCollection["myNonexistentKey"] = myValue). 不過, 如果指定的索引鍵已存在於字典中, 則Item[Object]設定屬性會覆寫舊值。However, if the specified key already exists in the dictionary, setting the Item[Object] property overwrites the old value. 相反地, Add方法不會修改現有的元素。In contrast, the Add method does not modify existing elements.

不論是否允許索引鍵, 都可能會有null不同的執行方式。Implementations can vary in whether they allow the key to be null.

適用於

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