private static void ProcessReflectedMethod(FieldInfo field, ReflectedMethodAttribute attr)
{
MethodInfo delegateMethod = field.FieldType.GetMethod("Invoke");
ParameterInfo[] parameters = delegateMethod.GetParameters();
Type trueType = attr.Type;
Type[] trueParameterTypes;
if (attr is ReflectedStaticMethodAttribute)
{
trueParameterTypes = parameters.Select(x => x.ParameterType).ToArray();
}
else
{
trueType = trueType ?? parameters[0].ParameterType;
trueParameterTypes = parameters.Skip(1).Select(x => x.ParameterType).ToArray();
}
MethodInfo methodInstance = trueType.GetMethod(attr.Name ?? field.Name,
(attr is ReflectedStaticMethodAttribute ? BindingFlags.Static : BindingFlags.Instance) |
BindingFlags.Public |
BindingFlags.NonPublic, null, CallingConventions.Any, trueParameterTypes, null);
if (methodInstance == null)
{
string methodType = attr is ReflectedStaticMethodAttribute ? "static" : "instance";
string methodParams = string.Join(", ",
trueParameterTypes.Select(x => x.Name));
throw new NoNullAllowedException(
$"Unable to find {methodType} method {attr.Name ?? field.Name} in type {trueType.FullName} with parameters {methodParams}");
}
if (attr is ReflectedStaticMethodAttribute)
{
field.SetValue(null, Delegate.CreateDelegate(field.FieldType, methodInstance));
}
else
{
ParameterExpression[] paramExp = parameters.Select(x => Expression.Parameter(x.ParameterType)).ToArray();
field.SetValue(null,
Expression.Lambda(Expression.Call(paramExp[0], methodInstance, paramExp.Skip(1)), paramExp)
.Compile());
}
}
private static void ProcessReflectedMethod(FieldInfo field, ReflectedMethodAttribute attr)
{
MethodInfo delegateMethod = field.FieldType.GetMethod("Invoke");
ParameterInfo[] parameters = delegateMethod.GetParameters();
Type trueType = attr.Type;
Type[] trueParameterTypes;
if (attr is ReflectedStaticMethodAttribute)
{
trueParameterTypes = parameters.Select(x => x.ParameterType).ToArray();
}
else
{
trueType = trueType ?? parameters[0].ParameterType;
trueParameterTypes = parameters.Skip(1).Select(x => x.ParameterType).ToArray();
}
var invokeTypes = new Type[trueParameterTypes.Length];
for (var i = 0; i < invokeTypes.Length; i++)
{
invokeTypes[i] = attr.OverrideTypes?[i] ?? trueParameterTypes[i];
}
MethodInfo methodInstance = trueType.GetMethod(attr.Name ?? field.Name,
(attr is ReflectedStaticMethodAttribute ? BindingFlags.Static : BindingFlags.Instance) |
BindingFlags.Public |
BindingFlags.NonPublic, null, CallingConventions.Any, invokeTypes, null);
if (methodInstance == null)
{
string methodType = attr is ReflectedStaticMethodAttribute ? "static" : "instance";
string methodParams = string.Join(", ",
trueParameterTypes.Select(x => x.Name));
throw new NoNullAllowedException(
$"Unable to find {methodType} method {attr.Name ?? field.Name} in type {trueType.FullName} with parameters {methodParams}");
}
if (attr is ReflectedStaticMethodAttribute)
{
if (attr.OverrideTypes != null)
{
ParameterExpression[] paramExp =
parameters.Select(x => Expression.Parameter(x.ParameterType)).ToArray();
var argExp = new Expression[invokeTypes.Length];
for (var i = 0; i < argExp.Length; i++)
{
if (invokeTypes[i] != paramExp[i].Type)
{
argExp[i] = Expression.Convert(paramExp[i], invokeTypes[i]);
}
else
{
argExp[i] = paramExp[i];
}
}
field.SetValue(null,
Expression.Lambda(Expression.Call(methodInstance, argExp), paramExp)
.Compile());
}
else
{
field.SetValue(null, Delegate.CreateDelegate(field.FieldType, methodInstance));
}
}
else
{
ParameterExpression[] paramExp =
parameters.Select(x => Expression.Parameter(x.ParameterType)).ToArray();
var argExp = new Expression[invokeTypes.Length];
for (var i = 0; i < argExp.Length; i++)
{
if (invokeTypes[i] != paramExp[i + 1].Type)
{
argExp[i] = Expression.Convert(paramExp[i + 1], invokeTypes[i]);
}
else
{
argExp[i] = paramExp[i + 1];
}
}
Debug.Assert(methodInstance.DeclaringType != null);
Expression instanceExp = paramExp[0].Type != methodInstance.DeclaringType
? Expression.Convert(paramExp[0], methodInstance.DeclaringType)
: (Expression)paramExp[0];
field.SetValue(null,
Expression.Lambda(Expression.Call(instanceExp, methodInstance, argExp), paramExp)
.Compile());
_log.Trace(
$"Reflecting field {field.DeclaringType?.FullName}#{field.Name} with {methodInstance.DeclaringType?.FullName}#{methodInstance.Name}");
}
}
