clr

问题 Does it internally get treated as an Array or does it get treated as a totally different type by the CLR? I am trying to implement integer values to the list. List<int> lst = new List<int>(); lst.Add(3); lst.Add(4); vs. I create an Array of integers int[] arr = new int[2]; arr[0] = 3; arr[1] = 4; Array returns better time span results. So why do people prefer List<>. 回答1: List<> is an implementation of a data structure, which takes care of allocating memory on a on-demand basis; it allows for

问题 public T Foo<T, U>(U thing) where T : new() { return new T(); } When there is no new() constraint, I understand how it would work. The JIT Compiler sees T and if it's a reference type makes uses the object versions of the code, and specializes for each value type case. How does it work if you have a new T() in there? Where does it look for? 回答1: If you mean, what does the IL look like, the compiler will compile in a call to Activator.CreateInstance<T> . The type you pass as T must have a

问题 Let's say we have the following method declaration: Public Function MyMethod(ByVal param1 As Integer, _ Optional ByVal param2 As Integer = 0, _ Optional ByVal param3 As Integer = 1) As Integer Return param1 + param2 + param3 End Function How does VB.NET make the optional parameters work within the confines of the CLR? Are optional parameters CLS-Compliant? 回答1: Interestingly, this is the decompiled C# code, obtained via reflector. public int MyMethod(int param1, [Optional,

问题 This question is a follow-up to comments in this thread. Let's assume we have the following code: // (1) lock (padlock) { // (2) } var value = nonVolatileField; // (3) Furthermore, let's assume that no instruction in (2) has any effect on the nonVolatileField and vice versa. Can the reading instruction (3) be reordered in such a way that in ends up before the lock statement (1) or inside it (2) ? As far as I can tell, nothing in the C# Specification (§3.10) and the CLI Specification (§I.12.6

问题 I've been reading CLR with C# 3.0 and I've been reflecting on Assemblies, Modules and Headers however things got complicated. This is what I understood but if would be great if someone can clarify things little bit more: Modules are result of csc.exe which contains IL code and Metadata tables. Metadata tables contains three different tables which are: Definition Tables such as "ModuleDef, TypeDef, PropertyDef, MethodDef, EventDef, FieldDef" Reference Tables such as "TypeRef, ModuleRef,

问题 Reading Beginning F# - Robert Pickering I focused on the following paragraph: Programmers coming from an OCaml background should be careful when using exceptions in F#. Because of the architecture of the CLR, throwing an exception is pretty expensive—quite a bit more expensive than in OCaml. If you throw a lot of exceptions, profile your code carefully to decide whether the performance costs are worth it. If the costs are too high, revise the code appropriately. Why, because of CLR, throwing

问题 This question is more out of curiosity than a real problem. Consider the following code (C# 4.0, if it matters): class Program { static Point myPoint = new Point(3, 5); static void Main(string[] args) { Console.WriteLine("Point Struct Before: " + myPoint); object point = GetPoint(); Console.WriteLine("Point Object Before: " + point); myPoint.X = 10; Console.WriteLine("Point Struct After: " + myPoint); Console.WriteLine("Point Object After: " + point); } static object GetPoint() { return

问题 I need to dynamically create a .NET 2.0 compatible assembly from within my .NET 4.0 process. Currently it is achieved with this: AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly(...) ModuleBuilder mb = assemblyBuilder.DefineDynamicModule(...); But unfortuntely all dll's produced are .NET 4.0 (inherited from my 4.0 process) which doesn't work with my other .NET 2.0 processes. Any idea how 2 different CLR versioned AppDomains can co-exist in the same process? 回答1: Have a look

问题 How can I get generics to work in Python.NET with CPython. I get an error when using the subscript syntax from Python.NET Using Generics TypeError: unsubscriptable object With Python 2.7.11 + pythonnet==2.1.0.dev1 >python.exe Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:32:19) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import clr >>> from System import EventHandler >>> from System import EventArgs >>> EventHandler

问题 Recently, my asp.net application crashed. I got the event logs on windows, two type exception message: Application: w3wp.exe Framework Version: v4.0.30319 Description: The process was terminated due to an internal error in the .NET Runtime at IP 000007FEF9CFDDE3 (000007FEF9B00000) with exit code 80131506. Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2 Faulting module name: clr.dll, version: 4.0.30319.1008, time stamp: 0x517a18ff Exception code: 0xc0000005