Enum.GetValues 方法
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
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)
- Source:
- Enum.cs
- Source:
- Enum.cs
- Source:
- Enum.cs
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
enumType
为 null
。
enumType
不是 Enum。
.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>()
- Source:
- Enum.cs
- Source:
- Enum.cs
- Source:
- Enum.cs
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
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。