/// <summary>
/// Used for none type safe method calls that return values
/// </summary>
/// <param name="method"></param>
/// <returns></returns>
public static Func <object, object[], object> CreateFastInvoke(this MethodInfo method)
{
ParameterExpression instanceParameter = Expression.Parameter(typeof(object), "target");
ParameterExpression argumentsParameter = Expression.Parameter(typeof(object[]), "arguments");
Expression <Func <object, object[], object> > lambda = null;
MethodCallExpression call = Expression.Call(
Expression.Convert(instanceParameter, method.DeclaringType),
method,
FastInvokeUtilities.CreateParameterExpressions(method, argumentsParameter));
if (method.ReturnType == typeof(void))
{
lambda = Expression.Lambda <Func <object, object[], object> >(
Expression.Block(call, Expression.Default(typeof(object))),
instanceParameter,
argumentsParameter);
}
else
{
lambda = Expression.Lambda <Func <object, object[], object> >(
call,
instanceParameter,
argumentsParameter);
}
return(lambda.Compile());
}
/// <summary>
/// Used when the type of the instance is known
/// </summary>
/// <param name="method"></param>
/// <returns></returns>
public static Func <TInstance, object[], object> CreateFastInvoke <TInstance>(this MethodInfo method)
{
ParameterExpression instanceParameter = Expression.Parameter(typeof(TInstance), "target");
ParameterExpression argumentsParameter = Expression.Parameter(typeof(object[]), "arguments");
Expression <Func <TInstance, object[], object> > lambda = null;
// because we know the type we don't have to convert the instanceParameter like none type safe CreateAsFunc
MethodCallExpression call = Expression.Call(
instanceParameter,
method,
FastInvokeUtilities.CreateParameterExpressions(method, argumentsParameter));
if (method.ReturnType == typeof(void))
{
// if method is void returns default value of object null
lambda = Expression.Lambda <Func <TInstance, object[], object> >(
Expression.Block(call, Expression.Default(typeof(object))),
instanceParameter,
argumentsParameter);
}
else
{
// if method is void returns default value of object null
lambda = Expression.Lambda <Func <TInstance, object[], object> >(
call,
instanceParameter,
argumentsParameter);
}
return(lambda.Compile());
}
/// <summary>
/// Used for constructors where the object type is known
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="ctor">The ctor.</param>
/// <returns></returns>
public static Func <object[], TType> CreateAsFastInvoke <TType>(this ConstructorInfo constructorInfo)
{
ParameterExpression argumentsParameter = Expression.Parameter(typeof(object[]), "arguments");
NewExpression call = Expression.New(
constructorInfo,
FastInvokeUtilities.CreateParameterExpressions(constructorInfo, argumentsParameter));
Expression <Func <object[], TType> > lambda = Expression.Lambda <Func <object[], TType> >(
call,
argumentsParameter);
return(lambda.Compile());
}
/// <summary>
/// Used for type safe method calls. Fastest way to invoke
/// </summary>
/// <param name="method"></param>
/// <returns></returns>
public static Func <TInstance, object[], TReturn> CreateFastInvoke <TInstance, TReturn>(this MethodInfo method)
{
ParameterExpression instanceParameter = Expression.Parameter(typeof(TInstance), "target");
ParameterExpression argumentsParameter = Expression.Parameter(typeof(object[]), "arguments");
// because we know the type we don't have to convert the instanceParameter like none type safe CreateAsFunc
MethodCallExpression call = Expression.Call(
instanceParameter,
method,
FastInvokeUtilities.CreateParameterExpressions(method, argumentsParameter));
Expression <Func <TInstance, object[], TReturn> > lambda = Expression.Lambda <Func <TInstance, object[], TReturn> >(
call,
instanceParameter,
argumentsParameter);
return(lambda.Compile());
}