c# - 我可以为属性使用集合初始值设定项吗？

Question

C# 中的属性可以与集合初始值设定项一起使用吗？

例如，我想执行如下操作:

[DictionaryAttribute(){{"Key", "Value"}, {"Key", "Value"}}]
public class Foo { ... }

我知道属性可以有命名参数，因为这看起来与对象初始值设定项非常相似，我想知道集合初始值设定项是否也可用。

Answer 1

更新: 抱歉我弄错了 - 传递自定义类型的数组是不可能的 :(

The types of positional and named parameters for an attribute class are limited to the attribute parameter types, which are:

1. One of the following types: bool, byte, char, double, float, int, long, short, string.
2. The type object.
3. The type System.Type.
4. An Enum type, provided it has public accessibility and the types in which it is nested (if any) also have public accessibility (Section 17.2).
5. Single-dimensional arrays of the above types. source

来源:stackoverflow .

您可以声明传递一个自定义类型的数组:

class TestType
{
  public int Id { get; set; }
  public string Value { get; set; }

  public TestType(int id, string value)
  {
    Id = id;
    Value = value;
  }
}

class TestAttribute : Attribute
{
  public TestAttribute(params TestType[] array)
  {
    //
  }
}

但是编译错误发生在属性声明上:

[Test(new[]{new TestType(1, "1"), new TestType(2, "2"), })]
public void Test()
{

}