我无法弄清楚如何从C调用泛型方法(静态和非静态)。
最大的罪魁祸首是调用泛型方法基本上没有文档记录,单声道存储库中没有示例,但有人提到这可能在文档中有用:
If you want to invoke generic methods, you must call the method on the "inflated" class, which you can obtain from the mono_object_get_class()
MonoClass *clazz;
MonoMethod *method;
clazz = mono_object_get_class (obj);
/*
* If there are more Add methods declared, you
* may use mono_method_desc_search_in_class (clazz, ":Add(T)"),
* you must substitute ":Add(T)" with the correct type, for example
* for List<int>, you would use ":Add(int)".
*/
method = mono_class_get_method_from_name (clazz, "Add", 1);
mono_runtime_invoke (method, obj, args, &exception);
不幸的是,这没有用,因为它没有显示完整的示例,无论我做什么(使用mono_object_get_class
或不使用),我最终会在调用泛型方法时发出警告,然后崩溃。
* Assertion: should not be reached at marshal.c:4315
SIGABRT stracktrace...
下面是一个示例C#类和调用它的C代码。调用非泛型方法工作正常,但我不知道如何调用泛型方法。我很感激任何有用的提示。
namespace foo {
class MainClass {
public static void Main(string[] args) {
Console.WriteLine("Main");
}
public void GenericMember<T>(T t) {
Console.WriteLine(t);
}
public static void GenericStatic<T>(T t) {
Console.WriteLine(t);
}
public void NonGenericMember(string t) {
Console.WriteLine(t);
}
public static void NonGenericStatic(string t) {
Console.WriteLine(t);
}
}
}
#include <mono/jit/jit.h>
#include <mono/metadata/mono-config.h>
#include <mono/metadata/metadata.h>
#include <mono/metadata/appdomain.h>
#include <mono/metadata/class.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/image.h>
#include <mono/metadata/object.h>
#include <mono/metadata/debug-helpers.h>
int main(int argc, char **argv) {
mono_config_parse(NULL);
MonoDomain *domain = mono_jit_init_version("app", "v4.0.30319");
MonoAssembly *assembly = mono_domain_assembly_open(domain, "foo.exe");
MonoImage *image = mono_assembly_get_image(assembly);
mono_jit_exec(domain, assembly, argc, argv);
MonoClass *klass = mono_class_from_name(image, "foo", "MainClass");
MonoObject *instance = mono_object_new(domain, klass)
MonoString *string = mono_string_new(domain, "hello");
void *params[] = { string };
//NonGenericStatic call (works)
MonoMethod *method = mono_class_get_method_from_name(klass, "NonGenericStatic", 1);
mono_runtime_invoke(method, NULL, params, NULL);
//NonGenericMember call (works);
method = mono_class_get_method_from(klass, "NonGenericMember", 1);
mono_runtime_invoke(method, instance, params, NULL);
//GenericStatic call (fails)
method = mono_class_get_method_from_name(klass, "GenericStatic", 1);
mono_runtime_invoke(method, NULL, params, NULL);
//GenericMember call (fails)
method = mono_class_get_method_from_name(klass, "GenericMember", 1);
mono_runtime_invoke(method, instance, params, NULL);
mono_jit_cleanup(domain, assembly);
return 0;
}
答案 0 :(得分:2)
你无法以这种方式调用泛型方法,遗憾的是文档有点误导。如果您想使用public void GenericMember<T>(T t)
参数调用String
,则必须找到带有签名public void GenericMember<String>(String t)
的方法并在其上使用mono_runtime_invoke
。
更简单的方法是通过C#实用程序方法使用MethodInfo.MakeGenericMethod方法:
public static IntPtr Utility(MethodInfo method, Type type)
{
return method.MakeGenericMethod(type).MethodHandle.Value;
}
使用嵌入式Mono API查找Utility
方法,使用代表MonoMethod*
方法的GenericMethod<T>(T t)
和您想要的类型(示例中的字符串)调用它。此调用的返回值为MonoMethod*
,代表GenericMethod<String>(String t)
。这是您需要调用的方法。
我发了一篇详细的帖子,其中包含源代码here。