Enum.GetValues 方法

定义

重载

GetValues(Type)

检索指定枚举中常数值的数组。

GetValues<TEnum>()

检索指定枚举类型中常数值的数组。

GetValues(Type)

检索指定枚举中常数值的数组。

public:
 static Array ^ GetValues(Type ^ enumType);
public static Array GetValues (Type enumType);
[System.Runtime.InteropServices.ComVisible(true)]
public static Array GetValues (Type enumType);
static member GetValues : Type -> Array
[<System.Runtime.InteropServices.ComVisible(true)>]
static member GetValues : Type -> Array
Public Shared Function GetValues (enumType As Type) As Array

参数

enumType
Type

枚举类型。

返回

一个数组,其中包含 enumType 中常数的值。

属性

例外

enumTypenull

enumType 不是 Enum

在仅限反射的上下文中通过反射调用方法,

- 或 -

enumType 是在仅限反射的上下文中加载的程序集中的类型。

.NET 8 及更高版本: enumType 是一种布尔支持的枚举类型。

示例

以下示例说明了 GetValues 的用法。

using namespace System;
enum class Colors
{
   Red, Green, Blue, Yellow
};

enum class Styles
{
   Plaid = 0,
   Striped = 23,
   Tartan = 65,
   Corduroy = 78
};

int main()
{
   Console::WriteLine(  "The values of the Colors Enum are:" );
   Array^ a = Enum::GetValues( Colors::typeid );
   for ( Int32 i = 0; i < a->Length; i++ )
   {
      Object^ o = a->GetValue( i );
      Console::WriteLine(  "{0}", Enum::Format( Colors::typeid, o,  "D" ) );
   }
   Console::WriteLine();
   Console::WriteLine(  "The values of the Styles Enum are:" );
   Array^ b = Enum::GetValues( Styles::typeid );
   for ( Int32 i = 0; i < b->Length; i++ )
   {
      Object^ o = b->GetValue( i );
      Console::WriteLine(  "{0}", Enum::Format( Styles::typeid, o,  "D" ) );

   }
}
// The example produces the following output:
//       The values of the Colors Enum are:
//       0
//       1
//       2
//       3
//       
//       The values of the Styles Enum are:
//       0
//       23
//       65
//       78
using System;

public class GetValuesTest {
    enum Colors { Red, Green, Blue, Yellow };
    enum Styles { Plaid = 0, Striped = 23, Tartan = 65, Corduroy = 78 };

    public static void Main() {

        Console.WriteLine("The values of the Colors Enum are:");
        foreach(int i in Enum.GetValues(typeof(Colors)))
            Console.WriteLine(i);

        Console.WriteLine();

        Console.WriteLine("The values of the Styles Enum are:");
        foreach(int i in Enum.GetValues(typeof(Styles)))
            Console.WriteLine(i);
    }
}
// The example produces the following output:
//       The values of the Colors Enum are:
//       0
//       1
//       2
//       3
//
//       The values of the Styles Enum are:
//       0
//       23
//       65
//       78
open System

type Colors =
    | Red = 0
    | Green = 1
    | Blue = 2
    | Yellow = 3
    
type Styles =
    | Plaid = 0
    | Striped = 23
    | Tartan = 65
    | Corduroy = 78

printfn $"The values of the Colors Enum are:"
for i in Enum.GetValues typeof<Colors> do
    printfn $"{i}"

printfn "\nThe values of the Styles Enum are:"
for i in Enum.GetValues typeof<Styles> do
    printfn $"{i}"

// The example produces the following output:
//       The values of the Colors Enum are:
//       0
//       1
//       2
//       3
//
//       The values of the Styles Enum are:
//       0
//       23
//       65
//       78
Public Class GetValuesTest
   
    Enum Colors
        Red
        Green
        Blue
        Yellow
    End Enum 'Colors
    
    Enum Styles
        Plaid = 0
        Striped = 23
        Tartan = 65
        Corduroy = 78
    End Enum 'Styles
    
    Public Shared Sub Main()
        
        Console.WriteLine("The values of the Colors Enum are:")
        Dim i As Integer
        For Each i In  [Enum].GetValues(GetType(Colors))
            Console.WriteLine(i)
        Next

        Console.WriteLine()
        
        Console.WriteLine("The values of the Styles Enum are:")
        For Each i In  [Enum].GetValues(GetType(Styles))
            Console.WriteLine(i)
        Next
    End Sub 
End Class 
' The example produces the following output:
'       The values of the Colors Enum are:
'       0
'       1
'       2
'       3
'       
'       The values of the Styles Enum are:
'       0
'       23
'       65
'       78

注解

数组的元素按枚举常量 (的二进制值(即按其无符号数量级) )排序。 下面的示例显示方法为枚举返回 GetValues 的数组的相关信息,该枚举包括负值、零和正值。

using System;

enum SignMagnitude { Negative = -1, Zero = 0, Positive = 1 };

public class Example
{
   public static void Main()
   {
      foreach (var value in Enum.GetValues(typeof(SignMagnitude))) {
         Console.WriteLine("{0,3}     0x{0:X8}     {1}",
                           (int) value, ((SignMagnitude) value));
}   }
}
// The example displays the following output:
//         0     0x00000000     Zero
//         1     0x00000001     Positive
//        -1     0xFFFFFFFF     Negative
open System

type SignMagnitude =
    | Negative = -1
    | Zero = 0
    | Positive = 1

for value in Enum.GetValues typeof<SignMagnitude> do
    printfn $"{value :?> int,3}     0x{value :?> int:X8}     {value :?> SignMagnitude}"
// The example displays the following output:
//         0     0x00000000     Zero
//         1     0x00000001     Positive
//        -1     0xFFFFFFFF     Negative
Public Enum SignMagnitude As Integer
   Negative = -1 
   Zero = 0
   Positive = 1
End Enum
   
Module Example
   Public Sub Main()
      Dim values() As Integer = CType([Enum].GetValues(GetType(SignMagnitude)), Integer())
      For Each value In values
         Console.WriteLine("{0,3}     0x{0:X8}     {1}",
                           value, CType(value, SignMagnitude).ToString())
      Next
   End Sub
End Module
' The example displays the following output:
'      0     0x00000000     Zero
'      1     0x00000001     Positive
'     -1     0xFFFFFFFF     Negative

方法 GetValues 返回一个数组,其中包含枚举的每个成员的值 enumType 。 如果多个成员具有相同的值,则返回的数组将包含重复值。 在这种情况下,使用返回数组中的每个值调用 GetName 方法不会还原分配给具有重复值的成员的唯一名称。 若要成功检索枚举成员的所有名称,请 GetNames 调用 方法。

GetValues无法在仅反射上下文中使用反射来调用 方法。 相反,可以使用 方法获取表示枚举成员 Type.GetFields 的对象 FieldInfo 数组,然后对数组的每个元素调用 FieldInfo.GetRawConstantValue 方法,从而检索所有枚举成员的值。 以下示例演示了此方法。 它要求在名为 Enumerations.dll 的程序集中定义以下枚举:

[Flags] enum Pets { None=0, Dog=1, Cat=2, Rodent=4, Bird=8,
                    Fish=16, Reptile=32, Other=64 };
[<Flags>] 
type Pets =
    | None = 0
    | Dog = 1
    | Cat = 2
    | Rodent = 4
    | Bird = 8
    | Fish = 16
    | Reptile = 32
    | Other = 64
<Flags> Public Enum Pets As Integer
   None = 0
   Dog = 1
   Cat = 2
   Rodent = 4
   Bird = 8
   Fish = 16
   Reptile = 32
   Other = 64
End Enum

程序集在仅反射上下文中加载, Type 实例化表示 Pets 枚举的对象,检索对象数组 FieldInfo ,并将字段值显示到控制台。

using System;
using System.Reflection;

public class Example
{
   public static void Main()
   {
      Assembly assem = Assembly.ReflectionOnlyLoadFrom(@".\Enumerations.dll");
      Type typ = assem.GetType("Pets");
      FieldInfo[] fields = typ.GetFields();

      foreach (var field in fields) {
         if (field.Name.Equals("value__")) continue;

         Console.WriteLine("{0,-9} {1}", field.Name + ":",
                                         field.GetRawConstantValue());
      }
   }
}
// The example displays the following output:
//       None:     0
//       Dog:      1
//       Cat:      2
//       Rodent:   4
//       Bird:     8
//       Fish:     16
//       Reptile:  32
//       Other:    64
open System
open System.Reflection

let assem = Assembly.ReflectionOnlyLoadFrom @".\Enumerations.dll"
let typ = assem.GetType "Pets"
let fields = typ.GetFields()

for field in fields do
    if not (field.Name.Equals "value__") then

        printfn $"""{field.Name + ":",-9} {field.GetRawConstantValue()}"""
// The example displays the following output:
//       None:     0
//       Dog:      1
//       Cat:      2
//       Rodent:   4
//       Bird:     8
//       Fish:     16
//       Reptile:  32
//       Other:    64
Imports System.Reflection

Module Example
   Public Sub Main()
      Dim assem As Assembly = Assembly.ReflectionOnlyLoadFrom(".\Enumerations.dll")
      Dim typ As Type = assem.GetType("Pets")
      Dim fields As FieldInfo() = typ.GetFields

      For Each field In fields
         If field.Name.Equals("value__") Then Continue For
          
         Console.WriteLine("{0,-9} {1}", field.Name + ":", 
                                         field.GetRawConstantValue())
      Next
   End Sub
End Module
' The example displays the following output:
'       None:     0
'       Dog:      1
'       Cat:      2
'       Rodent:   4
'       Bird:     8
'       Fish:     16
'       Reptile:  32
'       Other:    64

适用于

GetValues<TEnum>()

检索指定枚举类型中常数值的数组。

public:
generic <typename TEnum>
 where TEnum : value class static cli::array <TEnum> ^ GetValues();
public static TEnum[] GetValues<TEnum> () where TEnum : struct;
static member GetValues : unit -> 'Enum[] (requires 'Enum : struct)
Public Shared Function GetValues(Of TEnum As Structure) () As TEnum()

类型参数

TEnum

枚举的类型。

返回

TEnum[]

一个数组,其中包含 TEnum 中常数的值。

例外

.NET 8 及更高版本: TEnum 是一种布尔支持的枚举类型。

适用于