c# - 在 C# 中将参数传递给 Func<> 的最佳方法是什么？

Question

我有以下代码：

public void Test(Request request, Func<IEnumerable<Building>> buildings)
{
   vm.Buildings = Helper.GenerateDropdownList(request.BuildingId,() => buildings());
}

我现在想向buildings()回调传递一个额外的参数

public void Test(Request request, Func<IEnumerable<Building>> buildings)
{
   var cityId = GetCity();
   vm.Buildings = Helper.GenerateDropdownList(request.BuildingId,() => buildings(cityId));
}

输入该参数的正确方法是什么？

Answer 1

您的buildings代表将需要是 aFunc<T, TResult>而不是 a Func<TResult>。

假设cityId是int：

public void Test(Request request, Func<int, IEnumerable<Building>> buildings)
{
   var cityId = GetCity();
   m.Buildings = Helper.GenerateDropdownList(request.BuildingId,
                                             () => buildings(cityId));
}