formControlName must be used with a parent formGroup directive. You'll want to add a formGroup
异常情况描述Angular模板出现异常情况,如下所示:异常分析大概的意思就是formControlName没有在formGroup里面,所以猜测应该是模板位置不正确。代码查看<form class="signin-container" [formGroup]="signinForm" #for...
The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.
The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.How to solve the error The ObjectConte...
Linux系统used内存占用很大,而实际系统中个进程并没有占用这么多内存
问题 新装服务器,used内存占用很大,而实际系统中个进程并没有占用这么多内存 现象 top查看下,used很大,如果有其他外部程序向监控服务器的内存,used实际是个比较关键的指标,而该指标却并没有反应出服务器实际占用情况: 原因 实际这是缓存原因导致,可以通过命令释放,即上图的c...
mysql:Cannot proceed because system tables used by Event Scheduler were found damaged at server start
mysql 5.7.18sqlyog访问数据库,查看表数据时,出现Cannot proceed because system tables used by Event Scheduler were found damaged at server start原因:5.1升级到5.7的时候,数据库配置表...
C# : How to get most recently used instance from multiple running instances of my WPF application?
If there are multipple running applications, I need to get the most recently used. I know that I can find all running instances of my app using Proces...
QWidget: Cannot create a QWidget when no GUI is being used
使用vs当创建Qt Console Application来调用Qt的dll(含有gui界面)时,在Console Project Wizard应把GUI library选择上,当运行程序时出现: QWidget: Cannot create a QWidget when no GUI is b...
在ubuntu更新时,出现错误E: Some index files failed to download, they have been ignored, or old ones used inst
原文:https://blog.csdn.net/tian_ciomp/article/details/51339635在ubuntu更新时,出现错误E: Some index files failed to download, they have been ignored, or old ones...
ts问题处理(2): 'Promise' only refers to a type, but is being used as a value here.
error TS2585: 'Promise' only refers to a type, but is being used as a value here. Do you need to change your target library? Try changing the `lib` co...
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The index also can be used for LIKE comparisons if the argument to LIKE is a constant string that does not start with a wildcard character.
http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.htmlMySQL 5.7 Reference Manual / ... / Comparison of B-Tree and Hash Indexes9.3.8 Comparis...
Words used when reading Redis documents
Redis-----------------First pageevolution n.演变,进化,发展closely adv.紧密地trade off 交换物品,权衡achieved adj.高度完美的 v.实现,获得Redis------------------Redis-clirepresen...
[YARN] 2.2 GB of 2.1 GB virtual memory used. Killing container.
Spark程序在yarn的集群运行,出现 Current usage: 105.9 MB of 1 GB physical memory used; 2.2 GB of 2.1 GB virtual memory used. Killing Container. 错误。 我的运行环境是虚拟机,每个虚...
webstorm调试(一)提示css未使用的选择器Selector is never used
一、css未使用的选择器Selector 今天写vue的时候,给动态绑定了一个class属性,然后样式里面就给了warning,看起来怪怪的,很不舒服 ...
微信支付errcode:40163,code been used,错误小结
1、配置时注意,支付平台中的支付授权目录, 注意大小写。昨天碰到的问题,就是自己跳转时,路径写的全小写。跳转支付页面也能跳转过去,但是log中总是调用两次code,报40163错误。后改成和公总号支付相同路径,搞定。在微信支付的demo页面调试,加入跳出错误的提示。调试小技巧:function (r...
解决问题:The context cannot be used while the model is being created
使用Entity Framework (v6.1.3)突然遇到这个问题了,之前一直好好的,怎么破?此处省略了多次在“好”与“坏"的项目中试验的过程(苦啊),直接给出答案。答案是:没有按DbContext的机制来进行DbSet的实例化导致的。(我遇到的情况)我们一般在自己的DbContext里这样写p...
linux下, 再次遇到使用thinkphp的模板标签时,报错used undefined function \Think\Template\simplexml_load_string() 是因为没有安装 php-xml包
linux下, 使用thinkphp的模板标签,如 eq, gt, volist defined, present , empty等 标签时, 报错: used undefined function \Think\Template\simplexml_load_string(), 原因是 没有安装 ...
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8G内存 8cpu服务器 mysql 优化问题:key_buffer=3G, Key_blocks_used=2093403, Key_blocks_unused=0
一台服务器,数据文件是60多G,索引文件3.5G左右。原来的服务器内存不够用,于是迁到新服务器。 迁过去之后,想将key_buffer=4G,但show status 一看。可用索引cache块 Key_blocks_unused 只有190多万。每块size是1024.所以总共能用cache才2G...