ASP.net C＃，我怎么知道使用什么？

Question

I keep coming accross code samples online for ASP.net c#, however they never seem to list which namespaces they include, for example:

using System.Data.SqlClient;
etc etc

Am I missing something obvious or should I be expected to know exactly what namespaces each code example requires?

Answer 1

When I'm in that situation, typically I search for the class on MSDN . The documentation will tell you which namespaces contain the class.

Answer 2

If they don't include them, you can follow this list in order:

• Find that they are in one of the namespaces listed in the "blank code file" template , or
• In Visual Studio You can click the missing type and press shift+F10 or Ctrl+. To get the option to automatically add the using statement (if the assembly is referenced)
• With Resharper , Select the type and hit alt+enter for Resharper to find the namespace for you, and add it to the usings (possibly even reference the assembly as well)
• Go to MSDN and search the name.
• Go to Google and search the name (honestly, I normally do this before hitting MSDN anyway)
• Compain to the article author

Answer 3

If code samples use the assemblies that a project references by default, then you can hover on the class name and click shift+F10 which will add the using statement automatically. If the class is not in any of the referenced assemblies then you are out of luck and need to know in what assembly does the class resides.

A quick google search can help, and in time you will memorize the namespaces... Of course its best if samples included the namespace and reference info, but mostly they do not.

Answer 4

如果您正在Visual Studio中查看代码，只需将鼠标悬停在所需的类或对象上，如果存在该类或可以谷歌搜索特定的类，例如，如果您想了解更多有关该类的信息，则将获得有关该类的工具提示。 “ DataTable”类，只需在Google上搜索它，您就会知道它是Syste.Data命名空间的一部分。

Answer 5

I'm with the OP on this one. Having to just magically "know" what namespaces are required seems supremely silly.

I spent some time before C# as a Java Developer, and the NetBeans IDE will resolve these for you automatically. Ctrl-Shift-I, and it will insert all the packages (ie, namespaces) you need. If more than one package defines the class you are resolving, a window pops up and lets you choose which one you want.

For as fine a product as VS is, I am incredulous that this feature is not included.