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[英]How to find out if a property is an auto-implemented property with reflection?
[英]How to detect an auto-implemented property in a custom FxCop rule?
我正在嘗試為DTO編寫一個規則,它只允許自動實現的屬性。 如何使用FxCop API檢測到屬性是自動實現的?
實際上,用戶在IL編譯代碼中實現的自動屬性和屬性之間存在差異。 自動屬性設置器和getter使用System.Runtime.CompilerServices.CompilerGeneratedAttribute標記。
因此,使用NDepend工具, 您可以通過C#LINQ查詢編寫自定義代碼查詢和自定義代碼規則 ,匹配自動屬性getter和setter只需編寫LINQ查詢:
from m in Application.Methods
where (m.IsPropertyGetter|| m.IsPropertySetter)
&& m.IsGeneratedByCompiler
select m
請注意,在上面的屏幕截圖中,您可能會在Resources
生成的類中匹配getter和setter,為了防止這種情況,您可以添加像&& !m.ParentType.IsUsing("System.Resources.ResourceManager")
這樣的子句:
當然,所有這些都可以適應FxCop定制裁決系統。
免責聲明:我為NDepend工作
謝謝NDepend團隊的@Patrick。 這是生成的FxCop規則的代碼。
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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