C#如何实现自定义Attribute（特性）？元数据编程在C#中的高级应用

public class RequirePermissionAttribute : Attribute
{
    public string Permission { get; }

    public RequirePermissionAttribute(string permission)
    {
        Permission = permission;
    }
}

[AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class RequirePermissionAttribute : Attribute
{
    public string Permission { get; }

    public RequirePermissionAttribute(string permission)
    {
        Permission = permission;
    }
}

public static bool HasPermissionRequirement(MethodInfo method, string requiredPermission)
{
    var attr = method.GetCustomAttribute<RequirePermissionAttribute>();
    return attr != null && attr.Permission == requiredPermission;
}

public class OrderService
{
    [RequirePermission("ManageOrders")]
    public void DeleteOrder(int orderId)
    {
        // 删除订单逻辑
    }
}

// 调用时检查权限
var method = typeof(OrderService).GetMethod("DeleteOrder");
if (HasPermissionRequirement(method, "ManageOrders"))
{
    Console.WriteLine("该方法需要 ManageOrders 权限");
}

public class LogExecutionTimeAttribute : Attribute { }