EnumBuilder.DefineLiteral(String, Object) 方法

定義

命名空間:

System.Reflection.Emit

組件:

System.Reflection.Emit.dll

來源:

EnumBuilder.cs

使用指定的常數值，定義列舉類型中具名的靜態欄位。

public:
 System::Reflection::Emit::FieldBuilder ^ DefineLiteral(System::String ^ literalName, System::Object ^ literalValue);

public System.Reflection.Emit.FieldBuilder DefineLiteral (string literalName, object? literalValue);

member this.DefineLiteral : string * obj -> System.Reflection.Emit.FieldBuilder

Public Function DefineLiteral (literalName As String, literalValue As Object) As FieldBuilder

參數

literalName

String

靜態欄位的名稱。

literalValue

Object

常值的常數值。

傳回

FieldBuilder

定義的欄位。

範例

下列程式代碼範例示範如何使用 EnumBuilder在動態元件內建構列舉。 此範例會定義名為 Elevation的列舉，其基礎類型 Int32為 ，並建立兩個元素： Low，值為0，而 High值為1。 建立類型之後，元件會以名稱 TempAssembly.dll儲存。 您可以使用 Ildasm.exe (IL 反組譯程式) 來檢查此元件的內容。

注意

在 .NET Framework 2.0 版之前，此程式代碼範例不會產生正確的列舉。

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

void main()
{
    // Get the current application domain for the current thread.
    AppDomain^ currentDomain = AppDomain::CurrentDomain;
      
    // Create a dynamic assembly in the current application domain, 
    // and allow it to be executed and saved to disk.
    AssemblyName^ aName = gcnew AssemblyName("TempAssembly");
    AssemblyBuilder^ ab = currentDomain->DefineDynamicAssembly( 
            aName, AssemblyBuilderAccess::RunAndSave);
      
    // Define a dynamic module in "TempAssembly" assembly. For a single-
    // module assembly, the module has the same name as the assembly.
    ModuleBuilder^ mb = 
            ab->DefineDynamicModule(aName->Name, aName->Name + ".dll");
      
    // Define a public enumeration with the name "Elevation" and an 
    // underlying type of Int32.
    EnumBuilder^ eb = 
            mb->DefineEnum("Elevation", TypeAttributes::Public, int::typeid);
      
    // Define two members, "High" and "Low".
    eb->DefineLiteral("Low", (Object^) 0);
    eb->DefineLiteral("High", 1);

    // Create the type and save the assembly.
    Type^ finished = eb->CreateType();
    ab->Save(aName->Name + ".dll");

    for each (Object^ o in Enum::GetValues(finished))
    {
        Console::WriteLine("{0}.{1} = {2}", finished, o, (int)o);
    }
}

/* This code example produces the following output:

Elevation.Low = 0
Elevation.High = 1
 */

using System;
using System.Reflection;
using System.Reflection.Emit;

class Example
{
    public static void Main()
    {
        // Get the current application domain for the current thread.
        AppDomain currentDomain = AppDomain.CurrentDomain;

        // Create a dynamic assembly in the current application domain,
        // and allow it to be executed and saved to disk.
        AssemblyName aName = new AssemblyName("TempAssembly");
        AssemblyBuilder ab = currentDomain.DefineDynamicAssembly(
            aName, AssemblyBuilderAccess.RunAndSave);

        // Define a dynamic module in "TempAssembly" assembly. For a single-
        // module assembly, the module has the same name as the assembly.
        ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll");

        // Define a public enumeration with the name "Elevation" and an
        // underlying type of Integer.
        EnumBuilder eb = mb.DefineEnum("Elevation", TypeAttributes.Public, typeof(int));

        // Define two members, "High" and "Low".
        eb.DefineLiteral("Low", 0);
        eb.DefineLiteral("High", 1);

        // Create the type and save the assembly.
        Type finished = eb.CreateType();
        ab.Save(aName.Name + ".dll");

        foreach( object o in Enum.GetValues(finished) )
        {
            Console.WriteLine("{0}.{1} = {2}", finished, o, ((int) o));
        }
    }
}

/* This code example produces the following output:

Elevation.Low = 0
Elevation.High = 1
 */

Imports System.Reflection
Imports System.Reflection.Emit

Module Example
   
    Sub Main()
      
        ' Get the current application domain for the current thread.
        Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      
        ' Create a dynamic assembly in the current application domain, 
        ' and allow it to be executed and saved to disk.
        Dim aName As AssemblyName = New AssemblyName("TempAssembly")
        Dim ab As AssemblyBuilder = currentDomain.DefineDynamicAssembly( _ 
            aName, AssemblyBuilderAccess.RunAndSave)
      
        ' Define a dynamic module in "TempAssembly" assembly. For a single-
        ' module assembly, the module has the same name as the assembly.
        Dim mb As ModuleBuilder = _
            ab.DefineDynamicModule(aName.Name, aName.Name & ".dll")
      
        ' Define a public enumeration with the name "Elevation" and an 
        ' underlying type of Integer.
        Dim eb As EnumBuilder = _
            mb.DefineEnum("Elevation", TypeAttributes.Public, GetType(Integer))
      
        ' Define two members, "High" and "Low".
        eb.DefineLiteral("Low", 0)
        eb.DefineLiteral("High", 1)

        ' Create the type and save the assembly.
        Dim finished As Type = eb.CreateType()
        ab.Save(aName.Name & ".dll")

        For Each o As Object In [Enum].GetValues(finished)
            Console.WriteLine("{0}.{1} = {2}", finished, o, CInt(o))
        Next
   End Sub
End Module

' This code example produces the following output:
'
'Elevation.Low = 0
'Elevation.High = 1

備註

定義的欄位會設定欄位屬性 Public、 Static與 Literal 。

注意

在 .NET Framework 1.0 和 1.1 版中，必須使用 來定義列舉TypeBuilder，因為EnumBuilder會發出其元素的類型Int32而非列舉型別的列舉。 在 .NET Framework 2.0 版中，EnumBuilder發出元素具有正確類型的列舉。