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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
**
**
**
** Eventbuilder is for client to define eevnts for a class
**
**
===========================================================*/
using System;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Diagnostics.Contracts;
namespace System.Reflection.Emit
{
//
// A EventBuilder is always associated with a TypeBuilder. The TypeBuilder.DefineEvent
// method will return a new EventBuilder to a client.
//
public sealed class EventBuilder
{
// Make a private constructor so these cannot be constructed externally.
private EventBuilder() { }
// Constructs a EventBuilder.
//
internal EventBuilder(
ModuleBuilder mod, // the module containing this EventBuilder
String name, // Event name
EventAttributes attr, // event attribute such as Public, Private, and Protected defined above
//int eventType, // event type
TypeBuilder type, // containing type
EventToken evToken)
{
m_name = name;
m_module = mod;
m_attributes = attr;
m_evToken = evToken;
m_type = type;
}
// Return the Token for this event within the TypeBuilder that the
// event is defined within.
public EventToken GetEventToken()
{
return m_evToken;
}
private void SetMethodSemantics(MethodBuilder mdBuilder, MethodSemanticsAttributes semantics)
{
if (mdBuilder == null)
{
throw new ArgumentNullException(nameof(mdBuilder));
}
Contract.EndContractBlock();
m_type.ThrowIfCreated();
TypeBuilder.DefineMethodSemantics(
m_module.GetNativeHandle(),
m_evToken.Token,
semantics,
mdBuilder.GetToken().Token);
}
public void SetAddOnMethod(MethodBuilder mdBuilder)
{
SetMethodSemantics(mdBuilder, MethodSemanticsAttributes.AddOn);
}
public void SetRemoveOnMethod(MethodBuilder mdBuilder)
{
SetMethodSemantics(mdBuilder, MethodSemanticsAttributes.RemoveOn);
}
public void SetRaiseMethod(MethodBuilder mdBuilder)
{
SetMethodSemantics(mdBuilder, MethodSemanticsAttributes.Fire);
}
public void AddOtherMethod(MethodBuilder mdBuilder)
{
SetMethodSemantics(mdBuilder, MethodSemanticsAttributes.Other);
}
// Use this function if client decides to form the custom attribute blob themselves
public void SetCustomAttribute(ConstructorInfo con, byte[] binaryAttribute)
{
if (con == null)
throw new ArgumentNullException(nameof(con));
if (binaryAttribute == null)
throw new ArgumentNullException(nameof(binaryAttribute));
Contract.EndContractBlock();
m_type.ThrowIfCreated();
TypeBuilder.DefineCustomAttribute(
m_module,
m_evToken.Token,
m_module.GetConstructorToken(con).Token,
binaryAttribute,
false, false);
}
// Use this function if client wishes to build CustomAttribute using CustomAttributeBuilder
public void SetCustomAttribute(CustomAttributeBuilder customBuilder)
{
if (customBuilder == null)
{
throw new ArgumentNullException(nameof(customBuilder));
}
Contract.EndContractBlock();
m_type.ThrowIfCreated();
customBuilder.CreateCustomAttribute(m_module, m_evToken.Token);
}
// These are package private so that TypeBuilder can access them.
private String m_name; // The name of the event
private EventToken m_evToken; // The token of this event
private ModuleBuilder m_module;
private EventAttributes m_attributes;
private TypeBuilder m_type;
}
}
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