如何在自定义 FxCop 规则中检测自动实施的属性？

Question

我正在尝试为 DTO 编写一条规则，它只允许自动实现的属性。您如何检测属性是使用 FxCop API 自动实现的？

Answer 1

实际上，自动属性和用户在 IL 编译代码中实现的属性是有区别的。自动属性 setter 和 getter 标记为 System.Runtime.CompilerServices.CompilerGeneratedAttribute.

因此使用 NDepend 工具，where you can write custom code queries and custom code rules through C# LINQ queries，匹配自动属性 getter 和 setter 只是编写 LINQ 查询的问题：

from m in Application.Methods
where (m.IsPropertyGetter|| m.IsPropertySetter)
    && m.IsGeneratedByCompiler
select m

请注意，在上面的屏幕截图中，您可能会匹配 Resources 中生成的类中的 getter 和 setter，为防止这种情况，您可以添加一个子句，例如 && !m.ParentType.IsUsing("System.Resources.ResourceManager"):

当然，这一切都可以适配FxCop自定义裁定系统。

免责声明：我为 NDepend

工作

Answer 2

谢谢来自 NDepend 团队的@Patrick。这是生成的 FxCop 规则的代码。

using Microsoft.FxCop.Sdk;
using System.Linq;
using System.Runtime.CompilerServices;

namespace CustomFxRules
{
    internal sealed class IsAutoImplementedProperty : BaseIntrospectionRule
    {
        public IsAutoImplementedProperty()
            : base("IsAutoImplementedProperty", "CustomFxRules.CustomFxRules", typeof(IsAutoImplementedProperty).Assembly)
        {
        }

        public override TargetVisibilities TargetVisibility
        {
            get { return TargetVisibilities.ExternallyVisible; }
        }

        private TypeNode CompilerGeneratedAttributeType { get; set; }

        public override void BeforeAnalysis()
        {
            base.BeforeAnalysis();

            this.CompilerGeneratedAttributeType = FrameworkAssemblies.Mscorlib.GetType(
                Identifier.For("System.Reflection"),
                Identifier.For("CompilerGeneratedAttribute"));
        }

        public override ProblemCollection Check(Member member)
        {
            if (member.NodeType != NodeType.Property)
                return base.Check(member);

            var property = (PropertyNode)member;
            VisitProperty(property);
            return this.Problems;
        }

        private const string AddAutoImplementedPropertyResolutionName = "Add auto-implemented property";

        public override void VisitProperty(PropertyNode property)
        {
            if (property.Getter == null)
            {
                Problems.Add(new Problem(new Resolution(AddAutoImplementedPropertyResolutionName, "{0} property must have a getter", property.FullName)));
            }
            else if (property.Getter.Attributes.All(attributeNode => attributeNode.Type.FullName != typeof(CompilerGeneratedAttribute).FullName))
            {
                Problems.Add(new Problem(new Resolution(AddAutoImplementedPropertyResolutionName, "{0} property must have an auto-impelemented getter", property.FullName)));
            }

            if (property.Setter == null)
            {
                Problems.Add(new Problem(new Resolution(AddAutoImplementedPropertyResolutionName, "{0} property must have a setter", property.FullName)));
            }
            else if (property.Setter.Attributes.All(attributeNode => attributeNode.Type.FullName != typeof(CompilerGeneratedAttribute).FullName))
            {
                Problems.Add(new Problem(new Resolution(AddAutoImplementedPropertyResolutionName, "{0} property must have an auto-impelemented setter", property.FullName)));
            }
        }
    }
}

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如何在自定义 FxCop 规则中检测自动实施的属性？