clr | 易学教程

Is Thread is kernel object ?

阅读更多关于 Is Thread is kernel object ?

问题 In this book I read that each instance of the Thread class is actually allocating a kernel object - and this is one of the overheads of using Thread . As far as I know, the thread is not kernel object (only the process is a kernel object in this case. The thread that the process contains are not kernel objects?) Can someone explain? 回答1: Thread is a managed object first, you know the System.Threading.Thread class. It is an internal CLR object next, a C++ class also named Thread. There's

Could the CLR support a “function pointer” value type?

阅读更多关于 Could the CLR support a “function pointer” value type?

A few days ago I asked why delegates are reference types , based on my misguided notion that all you need for a delegate are two references: one to an object, and one to a function. What I completely overlooked (not because I wasn't aware, simply because I forgot) is that in .NET, delegates are at least partially in place to support events as a built-in implementation of the Observer pattern , which means that every delegate supports multiple subscribers by way of an invocation list . This got me thinking, delegates really play two different roles in the .NET world. One is that of a humble

Cannot obtain value because it has been optimized away

阅读更多关于 Cannot obtain value because it has been optimized away

I have a problem with debugging... All of a sudden I can't see the values of most variables while debugging. I've managed to get two different messages in the Immediate Window: Cannot obtain value of local or argument 'parameter' as it is not available at this instruction pointer, possibly because it has been optimized away. and Internal error in the expression evaluator. I've tried and checked the following things: Solution Configuration is set to debug ( not release) Project -> Settings -> Build -> Optimize code is not set Tools -> Options -> Debugging -> Use Managaed Compatibility Mode

C# Entity Framework 4 Common Language Runtime detected an invalid program error?

阅读更多关于 C# Entity Framework 4 Common Language Runtime detected an invalid program error?

问题 How do you debug/fix a "Common Language Runtime detected an invalid program" error? What exactly does it mean anyway? I have a C# MVC 2 web app that can deployed to two websites that reside on the same IIS 7.5 webserver (x64). One is the live site (deployed using Release configuration), the second is the beta site (deployed using a new Beta configuration created just for this project). The two websites are: Default Website/my_app Beta/my_app On the beta site when selecting a paged list of

OutOfMemoryException when a lot of memory is available

阅读更多关于 OutOfMemoryException when a lot of memory is available

We have an application that is running on 5 (server) nodes (16 cores, 128 GB Memory each) that loads almost 70 GB data on each machine. This application is distributed and serves concurrent clients, therefore, there is a lot of sockets usage. Similarly, for synchronization between multiple threads, there are a few synchronization techniques being used, mostly using System.Threading.Monitor . Now the problem is that while application is running and the data is traveling between these server nodes and between clients and servers, one or two server machines start receiving OutOfMemoryException

Call dll function from sql stored procedure using the current connection

阅读更多关于 Call dll function from sql stored procedure using the current connection

问题 Can I call a dll from a stored procedure using the open connection? I have a dll that gets data from SQL Server and I don't want to open a new connection when I call it from the stored procedure. Thank you Here is an exemple public class Class1 { public static SqlString GetName(SqlString str) { SqlCommand cmd = new SqlCommand(str.ToString()); cmd.CommandType = System.Data.CommandType.Text; string name = cmd.ExecuteScalar().ToString(); return name; } } and this is the SQL code CREATE FUNCTION

SQL CLR: Streaming table valued function results

阅读更多关于 SQL CLR: Streaming table valued function results

My issue is very similar to this issue. However, I'm using SQL Server 2005 Service Pack 2 (SP2) (v9.0.3042) and the solution posted there does not work for me. I tried using both connection strings. One is commented out in my code. I realize I can store all the results in a List or ArrayList in memory and return that. I've done that successfully, but that is not the goal here. The goal is to be able to stream the results as they are available. Is this possible using my version of SQL Server? Here's my code : (Note that the parameters aren't actually being used currently. I did this for

What are the most effective ways to use Lua with C#?

阅读更多关于 What are the most effective ways to use Lua with C#?

From my understanding, Lua is an embeddable scripting language that can execute methods on objects. What are the pitfalls to avoid? Is is it feasible to use Lua as an interpreter and execute methods in an web environment or as a rule engine? Lua is very fast - scripts can be precompiled to bytecodes and functions execute close to C++ virtual method calls. That is the reason why it is used in gaming industry for scripting AI, plugins, and other hi-level stuff in games. But you put C# and web server in your question tags. If you are not thinking of embedded web servers - than Lua is not very

Cast vs 'as' operator revisited

阅读更多关于 Cast vs 'as' operator revisited

问题 I know there are several posts already concerning the difference between casts and the as operator. They all mostly restate the same facts: The as operator will not throw, but return null if the cast fails Consequently, the as operator only works with reference types The as operator will not use user-defined conversion operators Answers then tend to debate endlessly the how to use or not use the one or the other and the pros and cons of each, even their performance (which interests me not at

Is Richter mistaken when describing the internals of a non-virtual method call?

阅读更多关于 Is Richter mistaken when describing the internals of a non-virtual method call?

问题 I would write this question directly to Jeffrey Richter, but last time he didn't answer me :) so I will try to get an answer with your help here, guys :) In the book "CLR via C#", 3rd edition, on p.108, Jeffrey writes: void M3() { Employee e; e = new Manager(); year = e.GetYearsEmployed(); ... } The next line of code in M3 calls Employee’s nonvirtual instance GetYearsEmployed method. When calling a nonvirtual instance method, the JIT compiler locates the type object that corresponds to the