core | 易学教程

Error to create field from the complex object in Entity Framework migration

阅读更多关于 Error to create field from the complex object in Entity Framework migration

问题 I am studying Entity Framework migration to .Net Core and when I will execute the migration I get an error. The problem is in create field to a complex field. I have the config class and in debug the code is executed. Config class public void Configure(EntityTypeBuilder<City> builder) { base.Configure(builder); builder.Property(x => x.Name) .IsRequired() .HasColumnType(VARCHAR) .HasMaxLength(150); builder.Property(x => x.Initials) .HasColumnType(VARCHAR) .HasMaxLength(5); builder.Property(x =

How to send and receive commands from a UDP network server via .NET Core console application

阅读更多关于 How to send and receive commands from a UDP network server via .NET Core console application

问题 First off, I'm sorry if there is a solution for this problem already. I have a UDP server, which is a scale, that is connected to the network. It is listening to any data being sent to it and response with a data back to the client, depending on what command is sent to it. I was able to test this with YAT, a software used to test serial communication. Testing UDP Connection on YAT I want to create a C# (.NET Core) console application that does the same thing. Basically, I want to connect to

How to create and use an instance of a class in XAML (.Net Core 3.0)?

阅读更多关于 How to create and use an instance of a class in XAML (.Net Core 3.0)?

问题 I am new to WPF and trying to learn by doing. I created a custom WPF tab called "MyTabClass" defined as a "UserControl" and want to instantiate it two times, each in a new UserControl called "Tab1" and "Tab2", which will both later be referenced into a TabControl of my main WPF app. Unfortunately, I can not get it to work, as I don't know how to instantiate... I've read and tried several links like How to create instance of class in XAML?, XAML- creating an instance of a class , XAML

alloc: invalid block - Are Tcl_IncrRefCount and Tcl_DecrRefCount thread safe for threaded Tcl / 1 interp per thread?

阅读更多关于 alloc: invalid block - Are Tcl_IncrRefCount and Tcl_DecrRefCount thread safe for threaded Tcl / 1 interp per thread?

问题 Our 32-bit server application statically embeds tcl 8.4.11. On Red Hat Linux 6.5 64-bit we're encountering crashes / core dumps. The failure looks like alloc: invalid block: 0xf6f00f58: 88 f6 0 At the bottom of the question, I've documented two different core dumps we've seen. We've isolated a potential root cause to a TCL object shared between two threads concurrently running separate TCL interpreter instances. We think it's because TCL object is passed to Tcl_IncrRefCount / Tcl_DecrRefCount

.NET Core的响应式框架,基于Ace Admin框架菜单导航,Bootstrap布局,fontAwesome图标,内嵌Iframe用EasyUI做数据绑定,动态配置列表,动态配置表单

阅读更多关于 .NET Core的响应式框架,基于Ace Admin框架菜单导航,Bootstrap布局,fontAwesome图标,内嵌Iframe用EasyUI做数据绑定,动态配置列表,动态配置表单

netnrf 响应式框架用于快速开发的响应式框架演示： https://rf2.netnr.com v3.x 前端采用 jQuery + Bootstrap + EasyUI + AceAdmin + fontAwesome 后端采用 .NET Core + EF + SQL（SQLServer、MySQL、PostgreSQL、SQLite）数据库脚本放置于 wwwroot/scripts/ 目录下数据库转换使用的工具： http://www.szmesoft.com/DB2DB 全部采用 LINQ，跨数据库、避免SQL注入 Visual Studio 2019 运行项目项目结构 Netnr.Core 类库（引用NuGet，源码地址： https://github.com/netnr/Netnr.ClassLibrary ） Netnr.Data 数据访问、仓储（Scaffold-DbContext 命令自动生成） Netnr.Domain 实体（Scaffold-DbContext 命令自动生成） Netnr.Fast 常用方法 Netnr.Func 应用 Netnr.ResponseFramework Web站点数据表用户（SysUser）角色、角色权限（SysRole）菜单（SysMenu）按钮（SysButton）日志（SysLog）字典

AVMIDIPlayer init with MusicSequence

阅读更多关于 AVMIDIPlayer init with MusicSequence

问题 AVMIDIPlayer has this initializer: initWithData:soundBankURL:error: This is in addition to an initializer for reading from a standard MIDI file. The data is NSData, which I assumed is in a standard MIDI file format. So, how to get that data? Well, the current way to create a MIDI sequence is the AudioToolbox MusicSequence. (AVAudioEngine even has a member of this type). MusicSequence has this converter: MusicSequenceFileCreateData ( MusicSequence inSequence, MusicSequenceFileTypeID inFileType

How do I get a core dump on OS X Lion?

阅读更多关于 How do I get a core dump on OS X Lion?

问题 I am working on a PostgreSQL extension in C that segfaults, so I want to look at the core dump file on my OS X Lion box. However, there are no core files in /cores or anywhere else that I can find. It appears that they are enabled in the system but are limited to a size of 0: > sysctl kern.coredump kern.coredump: 1 > ulimit -c 0 I tried setting ulimit -c unlimited in the shell session I'm using to start and stop PostgreSQL, and it seems to stick: > ulimit -c unlimited And yet no matter what I

Use tfs to b uild a project in svn

阅读更多关于 Use tfs to b uild a project in svn

问题 We have our source code (ASP.NET Core) within a svn repository. Now for Continuous Integration, we want to use TFS to build and deploy to Azure WebApp. We can't migrate our code to tfs.. Is this possible? 回答1: Subversion is a natively supported repository type when defining builds since TFS 2015 Update 1. You should be able to choose it on the "Repository" tab. There is a walkthrough available on VisualStudio.com. 回答2: You can build code you manage in Subversion in TFS 2017. You must install

How can I add a COM dll reference in my .net core project based on beta8?

阅读更多关于 How can I add a COM dll reference in my .net core project based on beta8?

问题 We have a .net core web project based on version dnx 1.0.0-beta8. I am trying to reference a COM dll which I have to register on the computer through regsvr32. Does .net core projects allow to reference com dlls. 回答1: To the best of my knowledge all currently released versions of .NET Core (1.1 and below) and .Net Standard (1.6 and below) do not have a way to add Com refrences due to the fact that .NET Core is designed to be multi-platform and COM is a windows specific feature. I do not know

Run gdb batch from shell script through shell_exec in php

阅读更多关于 Run gdb batch from shell script through shell_exec in php

问题 Ok, I have a php calling a shell script: shell_exec("sh /home/u-pc/Downloads/coredumps/analyze.sh"); In the shell script (analyze.sh) I have: ...# Other setup code... gzip -d coredump.gz tar xvg symbols.gz gdb -batch -ex "set logging on" -ex "bt" myprogram mycoredump -ex "set logging off" Now php is able to execute the shell script but only until untar of symbols. It doesn't seem to run the gdb command. I get no stacktrace log file. Interesting thing is, when I run the analyze.sh by itself,