小编Dus*_*gen的帖子

我一直在探索重新发明DataTable,我想知道它的用途是什么MarshalByValueComponent.我相信它是用于.NET远程处理(也许WinForms和的WebForms),但被换下的WCF取代.我在GitHub或Google上找不到任何值得注意的用法.是否MarshalByValueComponent仍在使用？

试图在核心mvc项目中打开防伪,但没有运气.做了什么:

添加过滤器以自动检查每个POST请求上的防伪标记.

services.AddMvc(o =>
{
  o.Filters.Add(new AutoValidateAntiforgeryTokenAttribute());
});

令牌生成以这种方式添加到每个页面.

@inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Antiforgery;
@{
   var antiforgeryRequestToken = Antiforgery.GetAndStoreTokens(Context).RequestToken;
}
...
...
<script>
    var antiforgeryToken = @Json.Serialize(antiforgeryRequestToken);
</script>

最后每个客户端ajax请求都添加了RequestVerificationToken这种方式.

var options = {
        url: o.url, type: 'POST', data: o.params, headers: { 'RequestVerificationToken': antiforgeryToken } };

我可以看到每个ajax请求都有令牌,但我总是为任何POST请求获得400.如果我禁用过滤器,它可以正常工作.但是一旦我启用它,asp.net核心就会在每个POST请求上启动验证,它总是返回400.

有任何想法吗？

更新:

我按照评论中的说明进行操作,现在代码如下所示.ConfigureServices方法:

services.AddMvc(o => { 
  o.Filters.Add(new HandleAllExceptionsFilterFactory()); 
  o.Filters.Add(new AutoValidateAntiforgeryTokenAttribute()); 
}); 

services.AddAntiforgery(o => o.CookieName = "XSRF-TOKEN");

这是注册的中间件:

app.Use(next => context => { 
if (context.Request.Path == "/") 
{ 
    var antiforgery = app.ApplicationServices.GetService<IAntiforgery>(); 
    var token = …

所以我有一个订单列表......如果列表为空,我想跳转到'其他'.

但是因为它的列表(即使它是空的)还有一个实例吗？对？无论如何,如果没有订单它仍然进入if语句,所以我尝试添加.count == 0...

但它仍然进入if语句......如果订单中没有实际记录,我需要说什么呢？其他....感谢任何回复

IEnumerable<OrderRecord> orders = _orderService.GetOrdersByCustomer(id, OrderStatus.Completed).ToArray();

if (orders != null && orders.Count() == 0 )
{
  //order exists
}
else
{
    //no order
}

我遵循教程Windows Azure SDK for Node.js - Compute Management来管理虚拟机.

我使用azure account cert exportto 下载了pem文件<Subscription GUID>.pem.

该脚本目前包含:

var subscriptionId ="<Subscription GUID>";
var pem = "<Subscription GUID>.pem";

var computeManagementClient = computeManagement.createComputeManagementClient(computeManagement.createCertificateCloudCredentials({
    subscriptionId: subscriptionId,
    pem: fs.readFileSync(pem)
}));

当我从Node.js运行它时会产生错误:

C:\Apps\azure\node_modules\azure-mgmt-compute\node_modules\azure-common\lib\util\validate.js:416
  throw new Error('Required argument ' + name + ' for function ' + func + ' is
        ^
Error: Required argument credentials.pem for function CertificateCloudCredentials is not defined
    at throwMissingArgument (C:\Apps\azure\node_modules\azure-mgmt-compute\node_modules\azure-common\lib\util\validate.js:416:9)
    at ArgumentValidator._.extend.string (C:\Apps\azure\node_modules\azure-mgmt-compute\node_modules\azure-common\lib\util\validate.js:426:7)
    at C:\Apps\azure\node_modules\azure-mgmt-compute\node_modules\azure-common\lib\services\credentials\certificateCloudCredentials.js:35:9
    at Object.validateArgs (C:\Apps\azure\node_modules\azure-mgmt-compute\node_modules\azure-common\lib\util\validate.js:478:3) …

我将FluentData用作数据库的orm，并尝试创建通用查询方法：

internal static T QueryObject<T>(string sql, object[] param, Func<dynamic, T> mapper)
{
    return MyDb.Sql(sql, param).QueryNoAutoMap<T>(mapper).FirstOrDefault();
}

除了我班上的职能：

public class MyDbObject
{
    public int Id { get; set; }
}


public static MyDbObject mapper(dynamic row)
{
    return new MyDbObject {
    Id = row.Id
    };
}

public static MyDbObject GetDbObjectFromTable(int id)
{
    string sql = @"SELECT Id FROM MyTable WHERE Id=@Id";
    dynamic param = new {Id = id};
    return Query<MyDbObject>(sql, param, mapper); 
}

在Query<MyDbObject>(sql, param, mapper)编译器上说：

An anonymous function or …

我<asp:Label> 希望根据我传递给它的Generic对象进行填充.

目前我有以下代码: -

    private void PopulateEnglishQuestion(int questionId)
    {
        ReportQuestion reportQuestion = questionsBll.GetReportQuestions().Where(x=> x.ReportQuestionId == questionId).FirstOrDefault();
        PopulateLabels(reportQuestion);
    }

    private void PopulateTranslatedQuesiton(int questionId)
    {
        ReportQuestionTranslation reportQuestionTranslation = questionsBll.GetReportQuestionsTranslation().Where(x => x.QuestionId == questionId).FirstOrDefault();
        PopulateLabels(reportQuestionTranslation);
    }

    private void PopulateLabels<T>(T item)
    {
        lblQuestionTitle.Text = typeof (T) == typeof (ReportQuestion)
                                    ? ((ReportQuestion) (item)).ReportQuestionTitle
                                    : ((ReportQuestionTranslation) (item)).ReportQuestionTitleTrans; 
    }

如何让PopulateLabels方法正常工作？

我想在C#中使用模块化编程.我试图用Linq查询创建一个方法.据我所知,我需要将Linq查询存储在变量中以便执行它.我创建了一个名为的类和方法SearchStudent(),但我不知道如何返回Linq查询.我该怎么办？

public var SearchStudent(string ogrenci_id)
{
    var query =
         from d in context.ogrencis
         where d.ogrenci_id ==Convert.ToInt32(ogrenci_id)
         select new
         {
             d.ogrenci_adi,
             d.ogrenci_soyadi
         };

    return query;
}

我正在IProducerConsumerCollection(T)从一个接口中公开一个接口,该接口将定期为另一个线程添加项目以供使用.

public interface IProducer<T>
{
    IProducerConsumerCollection<T> ProducerCollection { get; }
}

我试图BlockingCollection(T)在现有集合中使用a ,但似乎IProducerConsumerCollection(T)不支持直接添加:

var queue = new ConcurrentQueue<string>();
var blockingCollection = new BlockingCollection<string>(queue);

var task1 = Task.Run(() => {
    Console.WriteLine("Dequeued " + blockingCollection.Take());
    Console.WriteLine("Dequeued " + blockingCollection.Take());
});

var task2 = Task.Run(() => {
    Console.WriteLine("Enqueueing Hello");
    queue.Enqueue("Hello");

    Console.WriteLine("Enqueueing World");
    queue.Enqueue("World");
});

Task.WaitAll(task1, task2);

这将无限期挂起,因为它BlockingCollection(T)不会注意到新项目.

是否有类似于该BlockingCollection(T).Take方法的功能,或者有什么比这更简单:

static async Task<T> TakeAsync<T>(
    IProducerConsumerCollection<T> collection,
    CancellationToken token
)
{
    T result;

    while(!collection.TryTake(out result))
    { …