Mono 3.8.0 发布，此版本包括 711 个 commits，从 3 月 28 日开始有 61 位贡献者参与，修复了 58 个 bug。
值得关注的更新：
整个运行时的重要性能提升和伸缩性性改进
完成对 Windows 64 位的支持
usb 连接的调试器有线协议优化
在调试器方面：
Updated wire protocol better handles high latency connections such as those found when doing USB debugging.
Client library now aggressively caches information and batches requests. Under one test scenario single stepping packets transmitted dropped from 2233 to only 16, which the latency going from seconds to 20 milliseconds.
性能：
The JIT now better handle long remainders by powers of two, generating significantly better code.
Over 10x faster code is generated for delegates that only invoked once. C# features such as async and LINQ produces a lot of those delegates, so this improvement will impact everyone.
Improved alias analysis can now handle second order aliases and eliminate null checks.
The runtime now has a concurrently readable hashtable that can makes reflection heavy workloads significantly faster and more scalable.
垃圾回收：
Optimized one of the core data structures of the garbage collector should result in 5 to 10% reduction in collection times.
Bug 修复：
运行时：
Fix the leaking of mach ports introduced by 98bbf8512aec0fa01b4426583280f6d231d22187. Fixes #22068
Fix Process.PrivateMemorySize64 etc. on ios. Fixes #21882
Fix enum->int casts in gsharedvt code. Fixes #21893
Avoid making generic calls from gsharedvt methods normally, go through the rgctx infrastructure instead. Fixes #21677
Fix another native-types problem. Hopefully fixes #21670 and #21636
Use alias information to eliminate explicit null checks. Fixes #21645
Initialize fields in MonoField:GetFieldOffset () if needed. Fixes part of #21604
Properly handle rethrow outside of catch blocks. Fixes #20412
Disable runtime unit tests on linux, because it cannot be linked due to circular dependencies between libraries. Fixes #21520
When parsing a method header, ensure we pass any available generic context. Fixes #21388
Added new mono_domain_set_config function; used to fix ConfigurationErrorsException in #10468
Only apply the maverick stack size hack to the main thread. Fixes #10096
Don't hardcode the temp dir to /tmp, use g_get_tmp_dir instead. Fixes #20894
Explicit thread GC data around instead of relying on TLS storage. Fixes #20360
Make WaitForPendingFinalizers () really wait for the finalizers added by a previous GC. Fixes #20503
Fix the marshal7.cs test, longs can be aligned to 4 bytes on 32 bit linux, and the runtime no longer aligns structure sizes to 8 bytes. Fixes #20788
Fix the popping of LMF frames during unwinding. Fixes #20616
Fix the marshalling of ByValTStr types which have a size specified. Fixes #20674
Fix the decoding of MonoJitInfo. Fixes #16439
Make it possible to create views to magic zero size files such as /dev/zero. Fixes #19460
Free static bound delegate wrappers of dynamic methods. Fixes #19058
Don't perform double accounting of offset for named memory segments. Fixes #20591
Avoid joining attached threads. Fixes #19343
Fix support for custom marshallers defined in other assemblies. Fixes #20020
Fix a jit assertion on a class which contains an empty struct as a static field. Fixes #20349
Applied patch from Kyle Edwards kyleedwardsny@gmail.com. Fix isinf () check with clang. Fixes #20244
Fix constrained type unwrap for enum types. Fixes #18371
类库
Handle quoted filename value. Fixes #21960
Correctly handle partial chunk sizes. Fixes #20583
Tweak Dictionary initial capacity to be more conservative. Fixes #21375
Handle closed-over-null delegates created with IL when using InvokeDynamic. Fixes #21196
Fix a race in a Task test. Fixes #20921
Contract the values array when decoding an array with a negative number and a trailer that evals to zero. Fixes #20456
Fixes issue with expression columns and IsNull. Fixes #20925
Array qsort without head allocation. Fixes #20922
Enum::TryParse ignores leading whitespaces. Fixes #20870
Fix disposing of DelegatingHandler. Fixes #20818
Fix digest authentication (bug #18799)
Only recycle ServicePoints from the idle timer (fixes #19823)
Changed ConcurrentDictionary.Contains(KeyValuePair) to also compare value. Fixes #16990
Add System.ServiceModel.Security assembly. Fixes #20108
Removed NET_2_1 conditional blocks from FileInfo. Fixes #19862
C# 编译器
Update codegen for boolean loads. Fixes #21685
Effective base class can include inherited types. Fixes #21390
Handle duplicate resume point registration. Fixes #21387
Arguments can be empty when reporting missing params argument. Fixes #21215
Flow analysis of moved arguments. Fixes #20983
Run new initializer await checks only in async context. Fixes #20614[system.data] Parse numeric expressions using invariant culture. Fixes #20582
Reachability analysis should ignore local variables declarations. Fixes #20603
Check for missing dependencies of container types. Fixes #20382
Resolve event expression when testing left side expression. Fixes #20493
Flow analysis of binary expressions not using logical operators. Fixes #20515
MSBuild
Add 4.5.1 framework. Fixes #20827
Parsing conditions with property references. Fixes #20634
Implements property functions using constructor syntax. Fixes #12999
调试器
Avoid clearning event requests if they reference an assembly which is unloaded. Instead, remove the assembly reference from the event request so it stays active. Fixes #9924.
Mono 是一个由Novell 公司主持的项目。该项目的目标是创建一系列符合ECMA 标准（Ecma-334 和Ecma-335）的.NET 工具，包括C# 编译器和共通语言执行平台。与微软的.NET Framework 不同，Mono 项目不仅可以运行于Windows 系统上，还可以运行于Linux，FreeBSD，Unix，Mac OS X 和Solaris。
Mono 的开发工具 MonoDevelop
微软开发了一个称为共享源码公共语言基础（Shared Source Common Language Infrastructure，Shared Source CLI）的可用于 FreeBSD，Windows 和 Mac OS X 的 .NET 实现版本。微软的共享源码协议并不是开源软件协议，且可能对于社区来说也是不足够的（它明文禁止了对软件的商业用途）。我们还可以见到另外一个 .NET 实现版本，Portable.NET 项目，该项目与 Mono 项目有着很多相同的目标。
Mono 虚拟机包含一个实时编译引擎，该引擎可用于如下处理器：x86，SPARC，PowerPC，ARM，S390（32位模式和64位模式），x86-64，IA64 和64位模式的 SPARC。该虚拟机可以将代码实时编译或者预先编译到原生代码。对于那些没有列出来的系统，则使用的是代码解释器。
软件详情：http://www.mono-project.com/docs/about-mono/releases/3.8.0/
下载地址：http://mono.github.io/website/download/
来自:开源中国社区
