Comparer<T>.Default 属性

定义

返回由泛型参数指定的类型的默认排序顺序比较器。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)

属性值

继承 Comparer<T> 并作为 T 类型的排序顺序比较器的对象。An object that inherits Comparer<T> and serves as a sort order comparer for type T.

示例

下面的示例演示如何使用 Default 属性获取执行默认比较的对象。The following example shows how to use the Default property to get an object that performs the default comparison. 此示例是为 Comparer<T> 类提供的更大示例的一部分。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

注解

此属性返回的 Comparer<T> 使用 System.IComparable<T> 泛型接口(IComparable(Of T) 在C#Visual Basic 中为IComparable<T>)来比较两个对象。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. 如果类型 T 未实现 System.IComparable<T> 泛型接口,则此属性返回使用 System.IComparable 接口的 Comparer<T>If type T does not implement the System.IComparable<T> generic interface, this property returns a Comparer<T> that uses the System.IComparable interface.

调用方说明

对于字符串比较,建议使用 StringComparer 类,而不是<字符串>字符串)在 Visual Basic 中的比较器。For string comparisons, the StringComparer class is recommended over Comparer<String> (Comparer(Of String) in Visual Basic). StringComparer 类的属性返回预定义实例,这些实例可执行具有不同的区域性敏感性和区分大小写的组合的字符串比较。Properties of the StringComparer class return predefined instances that perform string comparisons with different combinations of culture-sensitivity and case-sensitivity. 同一个 StringComparer 实例的成员之间的区分大小写和区分大小写。The case-sensitivity and culture-sensitivity are consistent among the members of the same StringComparer instance.

有关区域性特定比较的详细信息,请参阅 System.Globalization 命名空间以及全球化和本地化For more information on culture-specific comparisons, see the System.Globalization namespace and Globalization and Localization.

适用于

另请参阅