DictionaryEntry 結構
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。
定義可設定或擷取的字典索引鍵/值組。
public value class DictionaryEntryC#
public struct DictionaryEntryC#
[System.Serializable]
public struct DictionaryEntryC#
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public struct DictionaryEntrytype DictionaryEntry = struct[<System.Serializable>]
type DictionaryEntry = struct[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type DictionaryEntry = structPublic Structure DictionaryEntry- 繼承
- 屬性
下列範例示範 如何使用 DictionaryEntry 來逐一 Hashtable 查看 物件。
// A simple example for the DictionaryEntry structure.
using namespace System;
using namespace System::Collections;
public ref class Example
{
public:
static void Main()
{
// Create a new hash table.
//
Hashtable^ openWith = gcnew Hashtable();
// Add some elements to the hash table. There are no
// duplicate keys, but some of the values are duplicates.
openWith->Add("txt", "notepad.exe");
openWith->Add("bmp", "paint.exe");
openWith->Add("dib", "paint.exe");
openWith->Add("rtf", "wordpad.exe");
// When you use foreach to enumerate hash table elements,
// the elements are retrieved as DictionaryEntry objects.
Console::WriteLine();
for each (DictionaryEntry de in openWith)
{
Console::WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
}
};
int main()
{
Example::Main();
}
/* This code example produces output similar to the following:
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
Key = dib, Value = paint.exe
Key = bmp, Value = paint.exe
*/
C#
// A simple example for the DictionaryEntry structure.
using System;
using System.Collections;
class Example
{
public static void Main()
{
// Create a new hash table.
//
Hashtable openWith = new Hashtable();
// Add some elements to the hash table. There are no
// duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");
// When you use foreach to enumerate hash table elements,
// the elements are retrieved as DictionaryEntry objects.
Console.WriteLine();
foreach (DictionaryEntry de in openWith)
{
Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
}
}
/* This code example produces output similar to the following:
Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
Key = dib, Value = paint.exe
Key = bmp, Value = paint.exe
*/
'A simple example for the DictionaryEntry structure.
Imports System.Collections
Module Example
Sub Main()
' Create a new hash table.
'
Dim openWith As New Hashtable()
' Add some elements to the hash table. There are no
' duplicate keys, but some of the values are duplicates.
openWith.Add("txt", "notepad.exe")
openWith.Add("bmp", "paint.exe")
openWith.Add("dib", "paint.exe")
openWith.Add("rtf", "wordpad.exe")
' When you use For Each to enumerate hash table elements,
' the elements are retrieved as DictionaryEntry objects.
Console.WriteLine()
For Each de As DictionaryEntry In openWith
Console.WriteLine("Key = {0}, Value = {1}", _
de.Key, de.Value)
Next de
End Sub
End Module
' This code example produces output similar to the following:
'
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe
'Key = dib, Value = paint.exe
'Key = bmp, Value = paint.exe
方法會 IDictionaryEnumerator.Entry 傳回這個類型的實例。
重要
不建議您將 結構用於 DictionaryEntry 新的開發。 相反地，建議您搭配 類別使用泛型 KeyValuePair<TKey,TValue> 結構 Dictionary<TKey,TValue> 。 如需詳細資訊，請參閱 不應在 GitHub 上使用非泛型集合 。
C# foreach 語句和 Visual Basic For Each 語句需要集合中每個元素的類型。 因為的每個 IDictionary 元素都是索引鍵/值組，所以項目類型不是索引鍵的類型或值的型別。 相反地，元素類型為 DictionaryEntry。 例如：
for each (DictionaryEntry de in openWith)
{
Console::WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
C#
foreach (DictionaryEntry de in openWith)
{
Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
For Each de As DictionaryEntry In openWith
Console.WriteLine("Key = {0}, Value = {1}", _
de.Key, de.Value)
Next de
語句 foreach 是列舉值周圍的包裝函式，它只允許讀取集合，而不寫入集合。
|
Dictionary |
初始化具有指定索引鍵和值之 DictionaryEntry 型別的執行個體。 |
| 產品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
