LocalBuilder Class

July 28, 2014

Represents a local variable within a method or constructor.

System.Object
  System.Reflection.LocalVariableInfo
    System.Reflection.Emit.LocalBuilder

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

public sealed class LocalBuilder : LocalVariableInfo

The LocalBuilder type exposes the following members.

  NameDescription
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.)
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  NameDescription
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (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.)
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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. 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 Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      // Create an assembly.
      AssemblyName myAssemblyName = new AssemblyName("SampleAssembly");

      AssemblyBuilder myAssembly =
         AppDomain.CurrentDomain.DefineDynamicAssembly(myAssemblyName,
             AssemblyBuilderAccess.Run);

      // Create a module. For a single-file assembly the module
      // name is usually the same as the assembly name.
      ModuleBuilder myModule =
          myAssembly.DefineDynamicModule(myAssemblyName.Name);

      // 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));
      outputBlock.Text += String.Format("local 'myString' type is: {0}\n", myLB1.LocalType);

      LocalBuilder myLB2 = myMethodIL.DeclareLocal(typeof(int));
      outputBlock.Text += String.Format("local 'myInt' type is: {0}\n", 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();

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

      outputBlock.Text += String.Format("Example.Function1 returned: {0}\n", myObject2);
   }
}
/* This code example produces the following output:

local 'myString' type is: System.String
local 'myInt' type is: System.Int32
Example.Function1 returned: string value
 */


Windows Phone OS

Supported in: 8.1, 8.0, 7.1

Windows Phone

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

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