AddRange引发“无法隐式转换类型”异常

Question

我不知道为什么这不起作用：

    Dictionary<string, List<GameObject>> prefabs = new Dictionary<string, List<GameObject>>();
    List<GameObject> slotPrefabs = new List<GameObject>();

    // yadda yadda yadda

    if (prefabs.ContainsKey(slot))
    {
        prefabs[slot] = prefabs[slot].AddRange(slotPrefabs);
    }
    else
    {
        prefabs.Add(slot, slotPrefabs);
    }

它给了我

  

无法将类型'void'隐式转换为'System.Collections.Generic.List'

我只想将其添加到字典键的现有列表中。

Answer 1

cmake_minimum_required(VERSION 3.0) project(Graphics) add_executable( trtangle triangle.cpp ) target_compile_options(trtangle PRIVATE -Wall -Wextra -pedantic) find_package(OpenGL REQUIRED) find_package(GLEW REQUIRED) find_package(glfw3 3.3 REQUIRED) target_include_directories(trtangle ${OPENGL_INCLUDE_DIRS} ${GLEW_INCLUDE_DIRS}) target_link_libraries(trtangle ${OPENGL_LIBRARIES} ${GLEW_LIBRARIES} glfw) 是一个void方法，这意味着它不会返回任何值。因此，您不能将其分配给变量。

因此，它应该是AddRange(slotPrefabs)而不是prefabs[slot] = prefabs[slot].AddRange(slotPrefabs);