1.c++定义多播委托，示例代码：

#include "Delegates/Delegate.h"DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FMyDelegate,  UObject*, SelectAgent);/****/
UCLASS(Blueprintable, DisplayName = "VM_PlaceEntity")
class PR_PLACEENTITY_MODEL_API UVM_PlaceEntity : public UMVVMViewModelBase
{GENERATED_BODY()public:UPROPERTY(BlueprintReadWrite, FieldNotify, Setter, Getter)UObject* SelectAgent;UPROPERTY(BlueprintAssignable, Category = "VM_PlaceEntity")FMyDelegate MulticastDelegate_SelectAgent;private:void SetSelectAgent(UObject* Value) { UE_MVVM_SET_PROPERTY_VALUE(SelectAgent, Value); MulticastDelegate_SelectAgent.Broadcast(Value); }UObject* GetSelectAgent() const { return SelectAgent; }};

2. 蓝图使用