Comparer<T>.Default Comparer<T>.Default Comparer<T>.Default Comparer<T>.Default Property

定義

傳回泛型引數指定之型別的預設排序次序比較子 (Comparer)。Returns a default sort order comparer for the type specified by the generic argument.

public:
 static property System::Collections::Generic::Comparer<T> ^ Default { System::Collections::Generic::Comparer<T> ^ get(); };
public static System.Collections.Generic.Comparer<T> Default { get; }
member this.Default : System.Collections.Generic.Comparer<'T>
Public Shared ReadOnly Property Default As Comparer(Of T)

屬性值

物件,繼承 Comparer<T>,並用做型別 T 的排序次序比較子。An object that inherits Comparer<T> and serves as a sort order comparer for type T.

範例

下列範例顯示如何使用Default屬性來取得執行預設比較的物件。The following example shows how to use the Default property to get an object that performs the default comparison. 這個範例是針對Comparer<T>類別提供之較大範例的一部分。This example is part of a larger example provided for the Comparer<T> class.

// Get the default comparer that 
// sorts first by the height.
Comparer<Box> defComp = Comparer<Box>.Default;

// Calling Boxes.Sort() with no parameter
// is the same as calling Boxs.Sort(defComp)
// because they are both using the default comparer.
Boxes.Sort();

foreach (Box bx in Boxes)
{
    Console.WriteLine("{0}\t{1}\t{2}",
        bx.Height.ToString(), bx.Length.ToString(), 
        bx.Width.ToString());
}
' Get the default comparer that 
' sorts first by the height.
Dim defComp As Comparer(Of Box) = Comparer(Of Box).Default

' Calling Boxes.Sort() with no parameter
' is the same as calling Boxs.Sort(defComp)
' because they are both using the default comparer.
Boxes.Sort()

For Each bx As Box In Boxes
          Console.WriteLine("{0}" & vbTab & "{1}" & vbTab & "{2}", _
                            bx.Height.ToString(), _
                            bx.Length.ToString(), _
                            bx.Width.ToString())
Next bx

備註

這個Comparer<T>屬性所傳回的會System.IComparable<T> IComparable<T> C#使用IComparable(Of T)泛型介面 (在 Visual Basic 中) 來比較兩個物件。The Comparer<T> returned by this property uses the System.IComparable<T> generic interface (IComparable<T> in C#, IComparable(Of T) in Visual Basic) to compare two objects. 如果類型T System.IComparable<T>未執行泛型介面Comparer<T> , 這個屬性會傳回使用System.IComparable介面的。If type T does not implement the System.IComparable<T> generic interface, this property returns a Comparer<T> that uses the System.IComparable interface.

給呼叫者的注意事項

若要進行字串比較StringComparer , 建議您在 Visual Basic 的比較子< >字串(字串)上使用類別。For string comparisons, the StringComparer class is recommended over Comparer<String> (Comparer(Of String) in Visual Basic). StringComparer類別的屬性會傳回預先定義的實例, 其會以區分文化特性和區分大小寫的不同組合來執行字串比較。Properties of the StringComparer class return predefined instances that perform string comparisons with different combinations of culture-sensitivity and case-sensitivity. 區分大小寫和區分文化特性, 在相同StringComparer實例的成員之間是一致的。The case-sensitivity and culture-sensitivity are consistent among the members of the same StringComparer instance.

如需有關文化特性特定比較的詳細資訊, System.Globalization請參閱命名空間和全球化和當地語系化For more information on culture-specific comparisons, see the System.Globalization namespace and Globalization and Localization.

適用於

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