[英]How to find out if a property is an auto-implemented property with reflection?
So in my case i am doing discovery of the structure of a class using reflection.所以就我而言,我正在使用反射来发现类的结构。 I need to be able to find out if a property is an auto-implemented property by the PropertyInfo object.
我需要能够确定某个属性是否是 PropertyInfo 对象自动实现的属性。 I assume that the reflection API does not expose such functionality because auto-properties are C# dependent, but is there any workaround to get this information?
我假设反射 API 不会公开此类功能,因为自动属性依赖于 C#,但是否有任何解决方法来获取此信息?
You could check to see if the get
or set
method is marked with the CompilerGenerated
attribute.您可以检查
get
或set
方法是否标有CompilerGenerated
属性。 You could then combine that with looking for a private field that is marked with the CompilerGenerated
attribute containing the name of the property and the string "BackingField"
.然后,您可以将其与查找标记为
CompilerGenerated
属性的私有字段相结合,该属性包含属性名称和字符串"BackingField"
。
Perhaps:也许:
public static bool MightBeCouldBeMaybeAutoGeneratedInstanceProperty(
this PropertyInfo info
) {
bool mightBe = info.GetGetMethod()
.GetCustomAttributes(
typeof(CompilerGeneratedAttribute),
true
)
.Any();
if (!mightBe) {
return false;
}
bool maybe = info.DeclaringType
.GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
.Where(f => f.Name.Contains(info.Name))
.Where(f => f.Name.Contains("BackingField"))
.Where(
f => f.GetCustomAttributes(
typeof(CompilerGeneratedAttribute),
true
).Any()
)
.Any();
return maybe;
}
It's not fool proof, quite brittle and probably not portable to, say, Mono.它不是万无一失的,非常脆弱,可能无法移植到 Mono 等。
This should do:这应该做:
public static bool IsAutoProperty(this PropertyInfo prop)
{
return prop.DeclaringType.GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
.Any(f => f.Name.Contains("<" + prop.Name + ">"));
}
The reason is that for auto-properties the Name
property of the backing FieldInfo
would look like:原因是对于自动属性,支持
FieldInfo
的Name
属性如下所示:
<PropertName>k__BackingField
Since characters <
and >
wouldn't appear for normal fields, a field with that kind of naming points to a backing field of an auto-property.由于字符
<
和>
不会出现在普通字段中,具有这种命名的字段指向自动属性的支持字段。 As Jason says, its brittle still.正如杰森所说,它仍然很脆弱。
Or to make it a tad faster,或者让它快一点,
public static bool IsAutoProperty(this PropertyInfo prop)
{
if (!prop.CanWrite || !prop.CanRead)
return false;
return prop.DeclaringType.GetFields(BindingFlags.NonPublic | BindingFlags.Instance)
.Any(f => f.Name.Contains("<" + prop.Name + ">"));
}
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