小编Lui*_*cia的帖子

我在使用代码优先方法播种数据库时遇到此错误.

一个或多个实体的验证失败.有关详细信息,请参阅"EntityValidationErrors"属性.

说实话,我不知道如何检查验证错误的内容.Visual Studio向我显示它是一个包含8个对象的数组,因此有8个验证错误.

这与我之前的模型有关,但我做了一些修改,我在下面解释:

• 我有一个名为Status的枚举,我将其更改为名为Status的类
• 我将类ApplicantsPositionHistory更改为在同一个表中有2个外键

请原谅我的长代码,但我必须将其全部粘贴.在以下代码的最后一行中抛出异常.

namespace Data.Model
{  
    public class Position
    {
        [DatabaseGenerated(System.ComponentModel.DataAnnotations.DatabaseGeneratedOption.Identity)]   
        public int PositionID { get; set; }

        [Required(ErrorMessage = "Position name is required.")]
        [StringLength(20, MinimumLength = 3, ErrorMessage = "Name should not be longer than 20 characters.")]
        [Display(Name = "Position name")]              
        public string name { get; set; }

        [Required(ErrorMessage = "Number of years is required")] 
        [Display(Name = "Number of years")]        
        public int yearsExperienceRequired { get; set; }

        public virtual ICollection<ApplicantPosition> applicantPosition { get; set; …

我使用VS 2015 RC和MVC模板创建了一个新的应用程序,并且没有修改任何代码行我有这个错误:

Method not found: '!!0[] System.Array.Empty()'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.MissingMethodException: Method not found: '!!0[] System.Array.Empty()'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. …

当与vs 2010一起使用asp.net mvc 3项目时,我有很多警告,如下所示:

我想知道我做错了什么,我需要改变一些东西,因为这是Visual Studio中的开箱即用项目.

警告1未声明'packages'元素.C:\ Users\LUIS.SIMBIOS\Documents\Visual Studio 2010\Projects\SlnHR\HR\packages.config 2 2 HR

警告2验证(XHTML 1.0 Transitional):属性'charset'不是元素'meta'的有效属性.C:\ Users\LUIS.SIMBIOS\Documents\Visual Studio 2010\Projects\SlnHR\HR\Views\Shared_Layout.cshtml 4 11 HR

警告20错误6002:表/视图'HR.dbo.vw_aspnet_Users'没有定义主键.已推断密钥,并将定义创建为只读表/视图.C:\ Users\LUIS.SIMBIOS\Documents\Visual Studio 2010\Projects\SlnHR\HRRazorForms\Models\HR.edmx 1 1 HRRazorForms

web.config中

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=152368
  -->

<configuration>
  <connectionStrings>
    <add name="ApplicationServices" connectionString="data source=xx; User Id=development; Password=xxxxx; Initial Catalog=HR" providerName="System.Data.SqlClient" />
  <add name="HREntities" connectionString="metadata=res://*/Models.HR.csdl|res://*/Models.HR.ssdl|res://*/Models.HR.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=xxxx;Initial Catalog=HR;User ID=development;Password=xxxx;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" /></connectionStrings>

  <appSettings>
    <add key="webpages:Version" value="1.0.0.0" />
    <add key="ClientValidationEnabled" value="true" />
    <add …

我需要使用powershell下载9频道,但我尝试过的脚本有错误:

1. 这个脚本

   $url="https://channel9.msdn.com/blogs/OfficeDevPnP/feed/mp4high"
   $rss=invoke-webrequest -uri $url 
   $destination="D:\Videos\OfficePnP"
   [xml]$rss.Content|foreach{ 
     $_.SelectNodes("rss/channel/item/enclosure") 
   }|foreach{ 
       "Checking $($_.url.split("/")[-1]), we will skip it if it already exists in $($destination)"
     if(!(test-path ($destination + $_.url.split("/")[-1]))){ 
       "Downloading: " + $_.url 
       start-bitstransfer $_.url $destination 
     } 
   }
   

   Run Code Online (Sandbox Code Playgroud)

   失败了,错误:

   无法解析响应内容,因为Internet Explorer引擎不可用,或者Internet Explorer的首次启动配置未完成.指定UseBasicParsing参数,然后重试.

2. 我也试过这个

   # --- settings ---
   $feedUrl = "https://channel9.msdn.com/blogs/OfficeDevPnP/feed/mp4high"
   $mediaType = "mp4high"
   $overwrite = $false
   $destinationDirectory = join-path ([Environment]::GetFolderPath("MyDocuments")) "OfficeDevPnP"
   
   # --- locals ---
   $webClient = New-Object System.Net.WebClient
   
   # --- functions ---
   function PromptForInput ($prompt, $default) {
    $selection = read-host "$prompt`r`n(default: $default)" …

   Run Code Online (Sandbox Code Playgroud)

我有一个简单的helloworld反应应用程序从在线课程创建,但我收到此错误:

配置对象无效.Webpack已使用与API架构不匹配的配置对象进行初始化. - 配置具有未知属性'postcss'.这些属性是有效的:object {amd？,bail？,cache？,context？,dependencies？,devServer？,devtool ?, entry,externals？,loader？,module？,name？,node？,output？,performance？ ,plugins？,profile？,recordsInputPath ?, recordsO utputPath？,recordsPath？,resolve？,resolveLoader？,stats？,target？,watch？,watchOptions？错别字:请纠正它们.
对于加载程序选项:webpack 2不再允许配置中的自定义属性.应该更新加载程序以允许通过module.rules中的加载程序选项传递选项.在更新加载器之前,可以使用LoaderOptionsPlugin将这些选项传递给加载器:plugins:[new webpack.LoaderOptionsPlugin({// test:/.xxx$/,//可能仅适用于某些模块选项:{postcss: ...}})] - configuration.resolve有一个未知属性'root'.这些属性是有效的:object {alias？,aliasFields？,cachePredicate？,descriptionFiles？,enforceExtension？,enforceModuleExtension？,extensions？,fileSystem？,mainFields？,mainFiles？,moduleExtensions？,modules？,plugins？,resolver？,symlinks ？,unsafeCache ?, useSyncFileSystemCalls？ - configuration.resolve.extensions [0]不应为空.

我的webpack文件是:

// work with all paths in a cross-platform manner
const path = require('path');

// plugins covered below
const { ProvidePlugin } = require('webpack');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');

// configure source and distribution folder paths
const srcFolder = 'src';
const distFolder = 'dist';

// merge the common configuration with the environment …

我想谷歌忽略这样的网址:

http://www.mydomain.com/new-printers?dir=asc&order=price&p=3

所有具有参数dir,order和price的url都应该被忽略但我没有使用Robots.txt的经验.

任何的想法？

所以,我的EF模型有关系,根据我在例子中看到的,这些关系应该用ICollection的虚拟属性来完成.

例:

 public class Task
    {
        public int Id { get; set; }
        public string Description { get; set; }
        public virtual ICollection<SubTask>  { get; set; }
    }

我在某处读到了我应该使用IEnumerable来防止延迟执行,这是正确的吗？这意味着如果我的DAL方法返回IEnumerable,仍然是IQueryable,那么SQL将在那一刻执行,而不是在我在网页中调用.TOList时.

那么,最佳做法是什么？我该怎么回事？IEnumerable,List？,IList,ICollection？

谢谢

我试图将我可以在部分重用的所有内容分开,这样我就可以更容易地进行维护.

但是我得到了这个例外:无法直接请求文件"〜/ Views/Position/Edit.cshtml",因为它调用了"RenderSection"方法

我创建了一个名为sections.cshtml的文件,其中包含以下内容:

@section scripts{
    <script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
}

在_layout.cshtml文件中,我将其更改为:

<head>
    <meta charset="utf-8" />
    <title>@ViewBag.Title</title>
    <link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
    @RenderSection("scripts", required:false)
    @*<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/modernizr-1.7.min.js")" type="text/javascript"></script>*@
</head>

当我在浏览器中转到视图并检查它只显示的源代码时:

<head>
    <meta charset="utf-8" />
    <title>Edit</title>
    <link href="/Content/Site.css" rel="stylesheet" type="text/css" />
</head>

我有以下代码连接到azure redis缓存.

   public class CacheConnectionHelper
    {
        private static Lazy<ConnectionMultiplexer> lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
        {
            return ConnectionMultiplexer.Connect(SettingsHelper.AzureRedisCache);
        });

        public static ConnectionMultiplexer Connection
        {
            get
            {
                return lazyConnection.Value;
            }
        }
    }

我用这种方式使用它

public static List<Models.Module> GetModules()
        {
            IDatabase cache = CacheConnectionHelper.Connection.GetDatabase();
            List<Models.Module> listOfModules = new List<Models.Module>();
            listOfModules = (List<Models.Module>)cache.Get("ApplicationModules");
            if (listOfModules == null)
            {
                listOfModules = dbApp.Modulos.ToList();
                cache.Set("ApplicationModules", listOfModules, TimeSpan.FromMinutes(SettingsHelper.CacheModuleNames));
                return listOfModules;
            }
            else {
                return listOfModules;
            }
        }

但是每天1或2次我得到这个例外:

 Additional information: It was not possible to connect to the redis …

我在这里有这个网站:http: //msdn.microsoft.com/en-us/library/jj164022(v = office.15).aspx

某些部分的文本说:以下JavaScript代码演示了如何使用JQuery生成此GET请求,该请求返回所有站点列表的JSON表示.它还假定您具有存储在accessToken变量中的有效OAuth访问令牌.如果您从应用程序Web中进行此调用,则不需要访问令牌,就像在SharePoint托管的应用程序中一样.

jQuery.ajax({
url: http:// site url/_api/web/lists,
type: "GET",
headers: {
"ACCEPT","application/json;odata=verbose",
"Authorization", "Bearer " + accessToken
},
})

具体问题是如何获取访问令牌？