clr

F# and C# 's CLR is same then why is F# faster than C#

由 百般思念 提交于 2019-12-01 16:47:24
I am confused and would appreciate if you enlighten me. F# uses same CLR as C# and underlying code is identical then how can one suggest that a function runs faster when written in F# than C#? If I use only immutable variables in C# and performance needs to be as high as possible then why use F#? underlying code is identical? Doubtful. In general, F# will be faster in some things and slower in others. The same is true of C#. Or even VB. Each language has its pluses. If there is an overall performance plus in most areas, it is in the compiler. If I use only immutable variables in C# and

Is the new C# async feature implemented strictly in the compiler

由 邮差的信 提交于 2019-12-01 16:46:43
问题 As a C# programmer whose interested in exploring "how things work", i am interested in understanding a bit more about the process that makes the new async feature work. I have followed Eric Lippert's excellent article series on async: Async blog posts I don't remember seeing anywhere any reference to the implementation of this feature (in a high level) except for the fact the the "compiler is doing most of the work" for us. Is this feature strictly a compiler feature then? does the compiler

what does “CLR20r3” stand for? (what version of the clr is it)

由 有些话、适合烂在心里 提交于 2019-12-01 15:59:54
the obvious choice would be "CLR version 2.0 revision 3" but unfortunatly there is no such a thing. The closest I can come to a definitive list is wikipedia , but that uses major/minor numbering systems. The reason this came up, is because I had a customer trying to run my .net4 app, but it kept crashing with clr20r3 MissingMethodException on XmlReader.Dispose() turns out the .net4 install failed on their computer so it didn't have the .net 4 system.xml.dll. But when troubleshooting this, I was trying to find out what clr20r3 meant (IIRC, .net 3 used the CLR2 also). anyone got a lead for

.NET: Is Type.GetHashCode guaranteed to be unique?

由 一个人想着一个人 提交于 2019-12-01 15:38:31
I have someone using Type.GetHashCode as if it were a primary key. I think this is a horrible idea but I wanted to know if there was some sort of documented special case that says no two types would have the same hash code. Dmitry There are no guarantees around GetHashCode except that it will likely be randomly distributed , not unique. Documentation specifically mentions that: The default implementation of the GetHashCode method does not guarantee unique return values for different objects . Furthermore, the .NET Framework does not guarantee the default implementation of the GetHashCode

System.Math.Abs() calls into native method System.AppDomain.GetId()?

由 这一生的挚爱 提交于 2019-12-01 15:37:10
问题 My conditional breakpoint sometimes works fine, and sometimes fails, with the following error: The condition for a breakpoint failed to execute. The condition was 'Math.Abs(-4.36767421599683 -x) < 1e-5'. The error returned was 'Evaluation of method System.Math.Abs() calls into native method System.AppDomain.GetId(). Evaluation of native methods in this context is not supported.'. How does it only work some of the time? Is there runtime trickery happening where the conditional breakpoint code

F# and C# 's CLR is same then why is F# faster than C#

由 末鹿安然 提交于 2019-12-01 15:33:02
问题 I am confused and would appreciate if you enlighten me. F# uses same CLR as C# and underlying code is identical then how can one suggest that a function runs faster when written in F# than C#? If I use only immutable variables in C# and performance needs to be as high as possible then why use F#? 回答1: underlying code is identical? Doubtful. In general, F# will be faster in some things and slower in others. The same is true of C#. Or even VB. Each language has its pluses. If there is an

D8045: cannot compile C file 'serialcommands.c' with the /clr option

由 纵然是瞬间 提交于 2019-12-01 15:14:09
问题 I am getting compiler error D8045. cannot compile C file 'serialcommands.c' with the /clr option. This file is a C library that has been written to talk over a serial port to a TI processor. The task that I need to do is wrap this library with a CLR wrapper (there will be additional questions posted to stackoverflow concerning marshalling data back and forth if you want some more easy points from CLI questions.) I just want to use this C library from my CLR wrapper. I went to Properties-

what does “CLR20r3” stand for? (what version of the clr is it)

由 做~自己de王妃 提交于 2019-12-01 14:43:33
问题 the obvious choice would be "CLR version 2.0 revision 3" but unfortunatly there is no such a thing. The closest I can come to a definitive list is wikipedia, but that uses major/minor numbering systems. The reason this came up, is because I had a customer trying to run my .net4 app, but it kept crashing with clr20r3 MissingMethodException on XmlReader.Dispose() turns out the .net4 install failed on their computer so it didn't have the .net 4 system.xml.dll. But when troubleshooting this, I

.NET: Is Type.GetHashCode guaranteed to be unique?

由 六月ゝ 毕业季﹏ 提交于 2019-12-01 14:36:58
问题 I have someone using Type.GetHashCode as if it were a primary key. I think this is a horrible idea but I wanted to know if there was some sort of documented special case that says no two types would have the same hash code. 回答1: There are no guarantees around GetHashCode except that it will likely be randomly distributed , not unique. Documentation specifically mentions that: The default implementation of the GetHashCode method does not guarantee unique return values for different objects .

Mapping CLR Parameter Data

由 穿精又带淫゛_ 提交于 2019-12-01 14:28:14
I am writing a stored procedure generator and I need to map CLR types to their SQL Server types. MSDN lists the type mappings at: http://msdn.microsoft.com/en-us/library/ms131092.aspx but I don't want to use a big switch statement to handle the mappings. Is there a simple way to retrieve the SQL Server type as a string using whatever process is used by System.Data.SqlTypes? I'd like a method signature like so: static string GetSqlType(Type clrType) { ... return sqlType; } So given the following call: string sqlType = GetSqlType(1.GetType()); sqlType should contain: "int". This is made rather
订阅 clr