DbConnectionStringBuilder.Keys 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
得到 ICollection 一個包含 DbConnectionStringBuilder鍵的 。
public:
virtual property System::Collections::ICollection ^ Keys { System::Collections::ICollection ^ get(); };public virtual System.Collections.ICollection Keys { get; }[System.ComponentModel.Browsable(false)]
public virtual System.Collections.ICollection Keys { get; }member this.Keys : System.Collections.ICollection[<System.ComponentModel.Browsable(false)>]
member this.Keys : System.Collections.ICollectionPublic Overridable ReadOnly Property Keys As ICollection屬性值
一個 ICollection 包含 的鍵 DbConnectionStringBuilder。
實作
- 屬性
範例
以下主控台應用程式範例會建立一個新的 DbConnectionStringBuilder，並新增一些鍵。 程式碼會迴圈顯示 ICollection 鍵值對的 return Properties Keys ，然後新增鍵。 由於屬性 Keys 回傳動態 ICollection，第二個迴圈顯示所有鍵值對，包括最新的項目。
static void Main()
{
DbConnectionStringBuilder builder = new
DbConnectionStringBuilder();
builder["Data Source"] = "(local)";
builder["Integrated Security"] = true;
builder["Initial Catalog"] = "AdventureWorks";
// Obtain reference to the collection of keys.
ICollection keys = builder.Keys;
Console.WriteLine("Keys before adding TimeOut:");
foreach (string key in keys)
Console.WriteLine("{0}={1}", key, builder[key]);
// Add a new item to the collection.
builder["Timeout"] = 300;
Console.WriteLine();
Console.WriteLine("Keys after adding TimeOut:");
// Because the Keys property is dynamically updated,
// the following loop includes the Timeout key.
foreach (string key in keys)
Console.WriteLine("{0}={1}", key, builder[key]);
Console.WriteLine();
Console.WriteLine("Press Enter to continue.");
Console.ReadLine();
}
Sub Main()
Dim builder As New DbConnectionStringBuilder
builder("Data Source") = "(local)"
builder("integrated security") = True
builder("Initial Catalog") = "AdventureWorks;NewValue=Bad"
' Obtain reference to the collection of keys.
Dim keys As ICollection = builder.Keys
Console.WriteLine("Keys before adding TimeOut:")
For Each key As String In keys
Console.WriteLine("{0}={1}", key, builder(key))
Next
' Add a new item to the collection.
builder("Timeout") = 300
Console.WriteLine()
Console.WriteLine("Keys after adding TimeOut:")
' Because the Keys property is dynamically updated,
' the following loop includes the Timeout key.
For Each key As String In keys
Console.WriteLine("{0}={1}", key, builder(key))
Next
Console.WriteLine()
Console.WriteLine("Press Enter to continue.")
Console.ReadLine()
End Sub
備註
中ICollection值的順序未明確說明，但與屬性回傳Values的相關值ICollection順序相同。
返回 ICollection 的 不是靜態副本;而是 ICollection 回溯到原始 DbConnectionStringBuilder的金鑰。 因此，對 的 DbConnectionStringBuilder 變化會反映在 ICollection中。
