[英]How to detect an auto-implemented property in a custom FxCop rule?
I'm trying to write a rule for DTOs, that only allows auto-implemented properties. 我正在尝试为DTO编写一个规则,它只允许自动实现的属性。 How do you detect that a property is auto-implemented using the FxCop API?
如何使用FxCop API检测到属性是自动实现的?
Actually there is a difference between auto-properties and properties implemented by user in the IL compiled code. 实际上,用户在IL编译代码中实现的自动属性和属性之间存在差异。 Auto-properties setters and getters are tagged with System.Runtime.CompilerServices.CompilerGeneratedAttribute .
自动属性设置器和getter使用System.Runtime.CompilerServices.CompilerGeneratedAttribute标记。
Hence with the tool NDepend, where you can write custom code queries and custom code rules through C# LINQ queries , matching auto-properties getters and setters is just a matter of writing the LINQ query: 因此,使用NDepend工具, 您可以通过C#LINQ查询编写自定义代码查询和自定义代码规则 ,匹配自动属性getter和setter只需编写LINQ查询:
from m in Application.Methods
where (m.IsPropertyGetter|| m.IsPropertySetter)
&& m.IsGeneratedByCompiler
select m
Notice in the screenshot above that you might match getters and setters in Resources
generated classes, to prevent this you can add a clause like && !m.ParentType.IsUsing("System.Resources.ResourceManager")
: 请注意,在上面的屏幕截图中,您可能会在
Resources
生成的类中匹配getter和setter,为了防止这种情况,您可以添加像&& !m.ParentType.IsUsing("System.Resources.ResourceManager")
这样的子句:
Of course, all this can be adapted to FxCop custom ruling system. 当然,所有这些都可以适应FxCop定制裁决系统。
Disclamer: I work for NDepend 免责声明:我为NDepend工作
Thank you @Patrick from NDepend team. 谢谢NDepend团队的@Patrick。 Here's the code for the resulting FxCop rule.
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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