private IntPtr Override(MethodBase method, IntPtr pointer)
{
var _type = method.ReturnType();
var _signature = method.Signature();
var _parameters = new Collection <ParameterExpression>(_signature.Select(_Type => Expression.Parameter(_Type)).ToArray());
var _method = new DynamicMethod(string.Empty, _type, _signature, method.DeclaringType, true);
var _body = _method.GetILGenerator();
_body.Emit(_signature, false);
_body.Emit(pointer, _type, _signature);
_body.Emit(OpCodes.Ret);
var _invocation = _signature.Instance == null?this.Override(method, null, _parameters, Expression.Call(_method, _parameters)) : this.Override(method, _parameters[0], _parameters.Skip(1), Expression.Call(_method, _parameters));
if (_invocation == null)
{
return(pointer);
}
_method = new DynamicMethod(string.Empty, _type, _signature, method.DeclaringType, true);
_body = _method.GetILGenerator();
_body.Emit(_signature, false);
_body.Emit(OpCodes.Call, Expression.Lambda(_invocation, _parameters).CompileToMethod());
_body.Emit(OpCodes.Ret);
_method.Prepare();
return(_method.GetFunctionPointer());
}
/// <summary>
/// 以托管代码默认约定调用动态方法。
/// </summary>
/// <param name="ilGen">ilGen</param>
/// <param name="dynamicMethod">动态方法</param>
public static ILGenerator Calli(this ILGenerator ilGen, DynamicMethod dynamicMethod)
{
// 保存引用。
GCHandle.Alloc(dynamicMethod);
return(ilGen.Calli(
dynamicMethod.GetFunctionPointer(),
dynamicMethod.ReturnType,
dynamicMethod.GetParameters().Map(item => item.ParameterType)));
}
/// <summary>
/// 以托管代码默认约定调用动态方法。
/// </summary>
/// <param name="ilGen">ilGen</param>
/// <param name="dynamicMethod">动态方法</param>
public static ILGenerator Calli(this ILGenerator ilGen, DynamicMethod dynamicMethod)
{
GCHandle.Alloc(dynamicMethod);
return(Calli(ilGen, dynamicMethod.GetFunctionPointer(), dynamicMethod.ReturnType, dynamicMethod.GetParameters().Select(item => item.ParameterType).ToArray()));
}