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LocalBuilder Class

LocalBuilder Class

Represents a local variable within a method or constructor.


Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

public sealed class LocalBuilder : LocalVariableInfo, 

The LocalBuilder type exposes the following members.

Public propertyIsPinnedGets a value indicating whether the object referred to by the local variable is pinned in memory. (Overrides LocalVariableInfo.IsPinned.)
Public propertyLocalIndexGets the zero-based index of the local variable within the method body. (Overrides LocalVariableInfo.LocalIndex.)
Public propertyLocalTypeGets the type of the local variable. (Overrides LocalVariableInfo.LocalType.)

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSetLocalSymInfo(String)Sets the name of this local variable.
Public methodSetLocalSymInfo(String, Int32, Int32)Sets the name and lexical scope of this local variable.
Public methodToStringReturns a user-readable string that describes the local variable. (Inherited from LocalVariableInfo.)

Explicit interface implemetationPrivate method_LocalBuilder.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers.
Explicit interface implemetationPrivate method_LocalBuilder.GetTypeInfoRetrieves the type information for an object, which can then be used to get the type information for an interface.
Explicit interface implemetationPrivate method_LocalBuilder.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1).
Explicit interface implemetationPrivate method_LocalBuilder.InvokeProvides access to properties and methods exposed by an object.

A LocalBuilder object can be defined using the DeclareLocal method.

The following example creates a static method (Shared in Visual Basic) named Function1 that returns a string and has a parameter of type Int32. In the body of the method, the code example creates LocalBuilder objects representing two local variables, and sets symbol information for the local variables. The method does not do anything significant, but the method body demonstrates storing a parameter to a local variable, storing a literal string to a local variable, and loading a local variable.

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

class LocalBuilder_Sample
    public static void Main()
        // Create an assembly.
        AssemblyName myAssemblyName = new AssemblyName();
        myAssemblyName.Name = "SampleAssembly";

        AssemblyBuilder myAssembly = 

        // Create a module. For a single-file assembly the module 
        // name is usually the same as the assembly name.
        ModuleBuilder myModule = 
                myAssemblyName.Name + ".dll", true);

        // Define a public class 'Example'.
        TypeBuilder myTypeBuilder = 
            myModule.DefineType("Example", TypeAttributes.Public);

        // Create the 'Function1' public method, which takes an integer 
        // and returns a string.
        MethodBuilder myMethod = myTypeBuilder.DefineMethod("Function1",
           MethodAttributes.Public | MethodAttributes.Static, 
           typeof(String), new Type[] { typeof(int) });

        // Generate IL for 'Function1'. The function body demonstrates 
        // assigning an argument to a local variable, assigning a  
        // constant string to a local variable, and putting the contents 
        // of local variables on the stack.
        ILGenerator myMethodIL = myMethod.GetILGenerator();

        // Create local variables named myString and myInt.
        LocalBuilder myLB1 = myMethodIL.DeclareLocal(typeof(string));
        Console.WriteLine("local 'myString' type is: {0}", myLB1.LocalType);

        LocalBuilder myLB2 = myMethodIL.DeclareLocal(typeof(int));
        myLB2.SetLocalSymInfo("myInt", 1, 2);
        Console.WriteLine("local 'myInt' type is: {0}", myLB2.LocalType);

        // Store the function argument in myInt.
        myMethodIL.Emit(OpCodes.Ldarg_0 );
        myMethodIL.Emit(OpCodes.Stloc_1 );

        // Store a literal value in myString, and return the value.
        myMethodIL.Emit(OpCodes.Ldstr, "string value"  );
        myMethodIL.Emit(OpCodes.Stloc_0 );
        myMethodIL.Emit(OpCodes.Ldloc_0 );
        myMethodIL.Emit(OpCodes.Ret );

        // Create "Example" class.
        Type myType1 = myTypeBuilder.CreateType();
        Console.WriteLine("'Example' is created.");

        myAssembly.Save(myAssemblyName.Name + ".dll");
        Console.WriteLine( "'{0}' is created.", myAssemblyName.Name + ".dll" );

        // Invoke 'Function1' method of 'Example', passing the value 42.
        Object myObject2 = myType1.InvokeMember("Function1", 
            BindingFlags.InvokeMethod, null, null, new Object[] { 42 });

        Console.WriteLine("Example.Function1 returned: {0}", myObject2);
/* This code example produces the following output:

local 'myString' type is: System.String
local 'myInt' type is: System.Int32
'Example' is created.
'SampleAssembly.dll' is created.
Example.Function1 returned: string value

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
© 2015 Microsoft