小编now*_*ed.的帖子

假设,我有这个界面,

interface IContact
{
    IAddress address { get; set; }
}

interface IAddress
{
    string city { get; set; }
}

class Person : IPerson
{
    public IContact contact { get; set; }
}

class test
{
    private test()
    {
        var person = new Person();
        if (person.contact.address.city != null)
        {
            //this will never work if contact is itself null?
        }
    }
}

Person.Contact.Address.City != null (这可以检查City是否为空.)

但是,如果Address或Contact或Person本身为null,则此检查将失败.

目前,我能想到的一个解决方案是:

if (Person != null && Person.Contact!=null && Person.Contact.Address!= null && Person.Contact.Address.City != …

我今天和我的同事进行了一次对话,她说她刚刚了解了使用该using声明背后的原因.

 //Using keyword is used to clean up resources that require disposal (IDisposable interface). 

 using (StreamReader reader = new StreamReader(@"C:\test.txt")) 
 { 
 string line = reader.ReadLine(); 
 } 

我指出,除非GC决定这样做,否则该物体被标记为"可以处置"但实际上没有处理和垃圾收集.

她回答说,一旦using语句结束,对象将自动处理,因为using语句被转换为try-catch-finally块.因此,对象必须放在using语句的最后.

我对此感到困惑,因为我知道使用using语句并不能保证对象被GC收集.所有发生的事情都是Dispose()调用该方法.GC无论如何都决定GC.但当她要求证明时,我找不到任何证据.

有谁知道这是如何工作的,以及如何证明它？

当WebAPI用户发生意外错误时,会看到整个堆栈跟踪.

我相信显示整个堆栈跟踪是不安全的.

停止向我的用户显示整个跟踪的默认行为是什么？

只是一个友好的信息,就像说Internal Server Error一个人就够了.正确？

有什么想法？

<?xml version="1.0"?>
<Error>
  <Message>An error has occurred.</Message>
  <ExceptionMessage>The method or operation is not implemented.</ExceptionMessage>
  <ExceptionType>System.NotImplementedException</ExceptionType>
  <StackTrace>   at MyCompany.BLL.RequirementOfService.Employee1.Employee1Service.MakeRequirementOfService(RequirementOfService RequirementOfService) in d:\Projects\MyFolder\Testing\WhiteBox\MyCompany.BAL.RequirementOfService\Employee1\Employee1Service.cs:line 37
   at MyCompany.BLL.RequirementOfService.RequirementOfServiceBLL.MakeRequirementOfService(RequirementOfService RequirementOfService) in d:\Projects\MyFolder\Testing\WhiteBox\MyCompany.BAL.RequirementOfService\RequirementOfServiceBLL.cs:line 76
   at MyCompany.RequirementOfService.Windsor.RequirementOfServiceProvider.MakeRequirementOfService(RequirementOfService RequirementOfService) in d:\Projects\MyFolder\Testing\WhiteBox\MyCompany.RequirementOfService\Windsor\RequirementOfServiceProvider.cs:line 47
   at MyCompany.RequirementOfService.RequirementOfService.Controllers.RequirementOfServiceController.Post(RequirementOfServiceDTO RequirementOfServiceDTO) in d:\Projects\MyFolder\Testing\WhiteBox\MyCompany.RequirementOfService\RequirementOfService\Controllers\RequirementOfServiceController.cs:line 87
   at lambda_method(Closure , Object , Object[] )
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.&lt;&gt;c__DisplayClass10.&lt;GetExecutor&gt;b__9(Object instance, Object[] methodParameters)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
--- End of stack trace …

从重写概念开始,我重写方法Equals和GetHashCode.

主要是我想出了这个"非常简单的代码":

internal class Person
    {
        public string name;

        public int age;

        public string lname;

        public Person(string name, int age, string lname)
        {
            this.name = name;
            this.age = age;
            this.lname = lname;
        }

        public override bool Equals(object obj)
        {
            var person = obj as Person;
            if (person != null)
            {
                return person.age == this.age && person.name == this.name && person.lname == this.lname;
            }

            return false;
        }

        public override int GetHashCode()
        {
            return this.age.GetHashCode() * this.name.GetHashCode() * …

最近在接受采访时,我得到了这个问题.

问:您是否编写过多线程应用程序？

答:是的

问:关心解释更多？

答:我用Tasks(任务并行库)来执行一些任务waiting for some info from internet while loading UI.这提高了我的应用程序可用性.

问:但是,您是否已经使用过TPL手段来编写multithreaded应用程序？

我:(不知道该说些什么1)

那么,什么是多线程应用程序呢？它与使用不同Tasks吗？

我所要做的就是实现观察者模式.

所以,我提出了这个解决方案:

我们有一个PoliceHeadQuarters,其主要工作是向所有订阅它的人发送通知.考虑到DSP,Inspector和SubInspector类订阅了PoliceHeadQuarters.

我写的使用事件和代表

public class HeadQuarters 
{
    public delegate void NewDelegate(object sender, EventArgs e);
    public event EventHandler NewEvent;
    public void RaiseANotification()
    {
        var handler = this.NewEvent;
        if (handler != null)
        {
            handler(this, new EventArgs());
        }
    }
}

public class SubInspector
{
    public void Listen(object sender, EventArgs e)
    {
        MessageBox.Show(string.Format("Event Notification received by sender = {0} with eventArguments = {1}", sender, e.ToString()));
    }
}

public class Inspector
{
    public void Listen(object sender, EventArgs e)
    {
        MessageBox.Show(string.Format("Event Notification received by sender …

我试图反序列化这个xml结构.

<?xml version="1.0"?>
<DietPlan>
    <Health>
        <Fruit>Test</Fruit>
        <Fruit>Test</Fruit>
        <Veggie>Test</Veggie>
        <Veggie>Test</Veggie>
    </Health>
</DietPlan>

我试过了:

[Serializable]
[XmlRoot(ElementName = "DietPlan")]
public class TestSerialization
{
    [XmlArray("Health")]
    [XmlArrayItem("Fruit")]
    public string[] Fruits { get; set; }

    [XmlArray("Health")]
    [XmlArrayItem("Veggie")]
    public string[] Veggie { get; set; }
}

但是这引发了一个异常"XML元素已经存在于当前范围内.使用XML属性为元素指定另一个XML名称或命名空间." 谢谢你.

这是我上一次采访的方式:

问题:字符串存储在哪里？

答:堆是因为它是参考类型

问题:请解释以下代码:

static void Main(string[] args)
{
     string one = "test";
     string two = one;
     one = one + " string";

     Console.WriteLine("One is {0}" , one);
     Console.WriteLine("Two is {0}", two);
}

答案:画了两张如下图:

(代表声明, string two = one;

(代表语句, one = one + " string";.在堆上创建一个新字符串并分配)

问题:正确.为下面的代码片段绘制类似的内容:

class Program
{
    static void Main(string[] args)
    {
        Test one = new Test { someString = "test" };
        Test two = one;
        one.someString = "test String";

        Console.WriteLine("One …

我刚刚开始尝试使用moq对我的模块进行单元测试.

实际上,我必须编写单元测试的类使用

Assembly.GetExecutingAssembly().Location 在内部确定路径.

但是,这在编写单元测试时不起作用,因为执行程序集的路径不同(采用单元测试程序集的路径)

AppData\\Local\\Temp\\3ylnx32t.ukg\\TestApplication.Test\\assembly\\dl3\\aeb938e6\\f3664631_d982ce01.

我试过,禁用阴影复制.

AppDomainSetup appDomain= new AppDomainSetup{ShadowCopyFiles = "false",};
appDomain.ShadowCopyFiles=false.ToString();

不过,它不起作用!

任何建议表示赞赏.提前致谢.

所以我有一个为DateTime类型实现的自定义Model Binder ,我将其注册如下:

void Application_Start(object sender, EventArgs e)
{
    // Code that runs on application startup
    GlobalConfiguration.Configuration.BindParameter(typeof(DateTime), new CurrentCultureDateTimeAPI());
}

然后我设置了2个示例操作以查看我的自定义模型绑定是否发生:

    [HttpGet]
    public void BindDateTime([FromUri]DateTime datetime)
    {
        //http://localhost:26171/web/api/BindDateTime?datetime=09/12/2014
    }


    [HttpGet]
    public void BindModel([FromUri]User user)
    {
        //http://localhost:26171/web/api/BindModel?Name=ibrahim&JoinDate=09/12/2014
    }

当我运行,并从提到的URL调用这两个动作,user的JoinDate财产被成功地使用定制绑定我配置的约束,但BindDateTime的datetime参数没有得到使用自定义粘合剂粘结.

我已经在配置中指定所有DateTime应该使用我的自定义绑定器然后为什么冷漠？建议非常感谢.

CurrentCultureDateTimeAPI.cs:

public class CurrentCultureDateTimeAPI: IModelBinder
{
    public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
    {
        var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        var date = value.ConvertTo(typeof(DateTime), CultureInfo.CurrentCulture);
        bindingContext.Model = date;
        return true;
    }
} …