是否有可能在LINQ查询中获取当前的枚举器(…或迭代器?不知道哪个是正确的)?
例如,我尝试创建所有当前加载的程序集的XML输出(通过LINQ to XML).
Dim xmldoc As XDocument = New XDocument( New XElement("Types",Assembly.GetExecutingAssembly().GetReferencedAssemblies() _ .Select(Function(name) Assembly.Load(name)) _ .SelectMany(Function(assembly) assembly.GetTypes()) _ .Select(Function(type) New XElement("Type",type.FullName))))
输出看起来像这样.
<Types> <Type>System.Object</Type> <Type>FXAssembly</Type> <Type>ThisAssembly</Type> <Type>AssemblyRef</Type> <Type>System.Runtime.Serialization.ISerializable</Type> <Type>System.Runtime.InteropServices._Exception</Type> ..... </Types>
是否有可能以某种方式从LINQ的选择中获得当前的“索引”(计数器?)?我想在XML中使用它
<Types> <Type ID="1">System.Object</Type> <Type ID="2">FXAssembly</Type> <Type ID="3">ThisAssembly</Type> <Type ID="4">AssemblyRef</Type> <Type ID="or-some-other-unique-id-#5">System.Runtime.Serialization.ISerializable</Type> ..... </Types>
是的 – 你只需要使用
overload of
Select
which takes a Func<TSource,int,TResult>
.所以在C#中它会是这样的:
XDocument doc = new XDocument(new XElement("Types",Assembly.GetExecutingAssembly().GetReferencedAssemblies() .Select(name => Assembly.Load(name)) .SelectMany(assembly => assembly.GetTypes()) .Select((type,index) => new XElement("Type",new XAttribute("ID",index + 1),type.FullName))));
对不起,它不是在VB中,但它更有可能以这种方式工作 – 希望你能解决这个问题:)