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AutoMapper：如果source == null，则创建目标类型的实例(AutoMapper: create instance of destination type if source == null)

 如果源对象为空，是否可以配置AutoMapper以返回目标类型的新实例？  
Source source = null;
Dest d1 = AutoMapper.Mapper.Map<Source, Dest>(source);
// d1 == null

// I'm looking for a way to configure AutoMapper to
// eliminate this code:
Dest d2 = AutoMapper.Mapper.Map<Source, Dest>(source) ?? new Dest();

Is it possible to configure AutoMapper to return a new instance of the destination type if the source object is null? 
Source source = null;
Dest d1 = AutoMapper.Mapper.Map<Source, Dest>(source);
// d1 == null

// I'm looking for a way to configure AutoMapper to
// eliminate this code:
Dest d2 = AutoMapper.Mapper.Map<Source, Dest>(source) ?? new Dest();

原文：https://stackoverflow.com/questions/3407838

更新时间：2024-04-10 10:04

最满意答案

 免责声明：我为创建我提到的产品的公司工作。  
 有很多方法可以跟踪应用程序使用情况。 其中之一就是在服务器上显示一个网页作为安装过程的最后一步，或者在应用程序中有一个闪现在该网页的启动画面。 使用这两种方法之一，您可以使用网络分析为您提供已安装或运行应用程序的用户与下载数量的粗略衡量。  
 另一种方法是使用PreEmptive Solutions的Runtime Intelligence产品，该产品可将使用情况跟踪功能直接注入到.NET（或Java）应用程序中。 这会给你测量有多少人正在运行你的软件以及系统配置文件信息。 您还可以添加跟踪特定功能的使用情况，以便您可以查看您的应用程序内部人们正在使用的内容（包括他们执行特定操作需要多长时间）。 我们使用Dotfuscator（或DashO for Java）作为我们的代码注入引擎，在编译后将新指令插入到您的应用程序中（类似于PostSharp的IL Weaving工作方式）。  
 Visual Studio 2010附带了该产品的免费版本。Beta 1目前可用，并将包含在未来的Beta版和Visual Studio的发行版中。 这将允许你使用任何.NET应用程序。  
 我已经撰写了一篇关于使用Visual Studio 2010中的免费版将Correcting Downloads to Usage关联的博客文章，还有一篇博客文章概述了免费版中包含的所有功能。 我正计划编写未来的博客文章，详细介绍向应用程序添加功能级别跟踪和度量。  
 有关免费Community Edition中提供的更多功能，您可以要求免费评估PreEmptive Solutions的商业版本。  
 你也可以看到这些其他的StackOverflow问题：  
 Windows应用程序分析  
 观察或监视使用远程应用程序的用户 

Disclaimer: I work for the company that has created the product I mention. 
There are a number of ways to track application usage. One of them is to display a web page on your server as the last step in the installation process or to have a splash screen in your application that hits that web page. With either of these you can use web analytics to give you a rough measurement of the users that have installed or run your application versus the number of downloads. 
Another method is to use the Runtime Intelligence product from PreEmptive Solutions, which will inject usage tracking functionality directly into your .NET (or Java) applications. This will give you measurements of how many people are actually running your software as well as system profile information. You can also add in tracking of specific feature usage so that you can see what people are using inside of your applications (including how long they take to perform certain actions). We use Dotfuscator (or DashO for Java) as our code injection engine to insert new instructions into your applications after they have been compiled (similar to how PostSharp's IL Weaving works). 
There is a free version of this product that is included with Visual Studio 2010. The Beta 1 is currently available and will be included in future Beta's and the release version of Visual Studio. This will allow you to instrument any .NET application.  
I have written a blog article on Correlating Downloads To Usage using the free version in Visual Studio 2010 and there is also a blog article with an overview of all of the functionality included in the free version. I am planning on writing future blog posts detailing adding feature level tracking and measurements to applications as well. 
For more features than are available in the free Community Edition you can request a free evaluation of the commercial version from PreEmptive Solutions. 
You can also see these other StackOverflow questions: 
Analytics for Windows Applications 
Observing Or Monitoring Users Working With An Application Remotely

AutoMapper：如果source == null，则创建目标类型的实例(AutoMapper: create instance of destination type if source == null)

最满意答案

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