asp.net mvc 学习备忘

本文介绍ASP.NET MVC5的基本概念,探讨模型、视图与控制器的作用及交互方式,并讨论了如何利用HTML Helper简化开发过程。此外,还涉及了数据验证、LINQ查询及国际化等高级主题。

参考书 pro asp.net mvc5 ,http://asp.net/mvc

asp.net mvc是传统asp.net窗体程序的一种替代,web form 有很多被人诟病的地方。mvc不是asp.net独有的。微软模仿了Rails 。

m model 模型

v view 视图

c control 控制器

控制器里的每个方法称为action,每个action对应一个view,

view不是一个完整的页面,而是部分页面。导航,底部等共同的部分,放在layout文件中。

m 用来建立模型。呈现数据的工作在view中完成,view是一个cshtml文件,c#和html混合的文件,通过razor语法,@{}来实现在html中嵌入c#代码。

一张数据表的创建,读取、修改、删除操作,包括数据库的建立都是自动完成的。

现在有几个问题,

1.如何处理关联表的数据

2.如何控制根据模型生成的数据表,对模型的定义可以参考http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.aspx


view中有一个@model 确定了当前这个view,操作的数据模型,可以是一个list,一个类。一个记录集对于一个list,一条记录对应一个类。

模型通过control中的方法view()传给view。

3.@html 的方法有哪些?如@html.displayfor,@html.actionlink, =>等等。详情可以参考htmlhelper,http://msdn.microsoft.com/en-us/library/system.web.mvc.htmlhelper(v=vs.108).aspx


各种错误的状态,都有对应的类去处理,以前都是自己写错误处理。现在这个方法显然更利于测试和修改。

如HttpNotFound(),HttpstatusCode.badrequest()


为了防止伪造客户端输入可以采用@html.antiforgerytoken(), Generates a hidden form field (anti-forgery token) that is validated when the form is submitted.

4.model 的bind方法

5.LINQ查询的语法,http://msdn.microsoft.com/en-us/library/bb397926.aspx

6.lambda 表达式 http://msdn.microsoft.com/en-us/library/bb397687.aspx

7.关于查询的更多内容,参考这个链接,现在已经很少直接构建sql语句了。http://msdn.microsoft.com/en-us/library/bb738633.aspx

8.默认产生的页面,很多操作都是英文的。有没有可以设置和保存跨文化的翻译的地方,支持多种语言。?

9.自动化测试怎么做?


下面对前面看文章的时候产生的这些问题。寻找一些解答。


对模型的定义可以参考The System.ComponentModel.DataAnnotations namespace provides attribute classes that are used to define metadata for ASP.NET MVC and ASP.NET data controls.  这个定义同时影响数据库定义和客户端验证。如可以设置key,正则表达式验证,最大长度,最小长度,取值范围range,指定数据类型,指定数据的显示格式displayformat等。

修改模型定义后,可以删除对应的数据表进行重建。或者用Code First Migrations


@html是一个helper,用来产生一些html的内容。在html上又套上一层,有必要吗?

linq的好处是支持更广泛的数据库如sql,xml等。linq的功能类似sql,可以用的时候再来查如何用linq来实现。几次以后也就熟悉了。

limbda 可以理解为一段没有函数申明的函数体,左边是输入参数,右边是逻辑结果,返回是右边的逻辑运算结果。




AspNetMVC2_RC_VS2008.exe ASP.NET MVC 2 Release Candidate Release Notes This document describes the Release Candidate release of the ASP.NET MVC 2 framework. Installation Notes 2 Documentation 2 Support 2 Upgrading an ASP.NET MVC 1.0 Project to ASP.NET MVC 2 2 New Features 3 ASP.NET MVC validation scripts have been moved to their own file 4 ASP.NET MVC validation scripts can be included at the top or bottom of a page 4 ASP.NET MVC validation scripts support globalization 4 Html.ValidationSummary helper method can display model-level errors 4 T4 templates in Visual Studio generate code that is specific to the target version of the .NET Framework 4 Other Improvements 4 Bug Fixes 5 Breaking Changes 5 Changes in ASP.NET MVC 2 Release Candidate 5 Changes in ASP.NET MVC 2 Beta 6 Changes in ASP.NET MVC 2 Preview 2 6 Changes in ASP.NET MVC 2 Preview 1 7 Known Issues 7 Disclaimer 8 This document describes the Release Candidate release of ASP.NET MVC 2 for Visual Studio 2008 SP1. Installation Notes The ASP.NET MVC 2 Release Candidate for Visual Studio 2008 SP1 can be downloaded from the following page: http://go.microsoft.com/fwlink/?LinkID=157071 ASP.NET MVC 2 can be installed and can run side-by-side with ASP.NET MVC 1.0. Note   Because Visual Studio 2008 and Visual Studio 2010 Beta 2 share a component of ASP.NET MVC 2, installing the ASP.NET MVC 2 Release Candidate release on a computer where Visual Studio 2010 Beta 2 is also installed is not supported. Documentation Documentation for ASP.NET MVC 2, which includes tutorials, technology overviews, code samples, and API reference, is available on the MSDN Web site. A good starting point is the ASP.NET Model View Controller (MVC) topic (http://go.microsoft.com/fwlink/?LinkId=159758). Tutorials and other information about ASP.NET MVC are also available on the ASP.NET Web site (http://www.asp.net/mvc/). Support This is a Release Candidate (RC) release and is not officially supported. If you have questions about working with this release, post them to the ASP.NET MVC forum (http://forums.asp.net/1146.aspx), where members of the ASP.NET community are frequently able to provide informal support. Upgrading an ASP.NET MVC 1.0 Project to ASP.NET MVC 2 To upgrade an existing ASP.NET MVC 1.0 application to version 2, follow these steps: Make a backup of the existing project. Open the project file in a text editor (the file with the .csproj or .vbproj file extension) and find the ProjectTypeGuid element. As the value of that element, replace the GUID {603c0e0b-db56-11dc-be95-000d561079b0} with {F85E285D-A4E0-4152-9332-AB1D724D3325}. When you are done, the value of that element should be as follows: <ProjectTypeGuids>{F85E285D-A4E0-4152-9332-AB1D724D3325};{349c5851-65df-11da-9384-00065b846f21};{fae04ec0-301f-11d3-bf4b-00c04f79efbc}</ProjectTypeGuids> In the Web application root folder, edit the Web.config file. Search for System.Web.Mvc, Version=1.0.0.0 and replace all instances with System.Web.Mvc, Version=2.0.0.0. Repeat the previous step for the Web.config file located in the Views directory. Open the project using Visual Studio, and in Solution Explorer, expand the References node. Delete the reference to System.Web.Mvc (which points to the version 1.0 assembly). Add a reference to System.Web.Mvc (v2.0.0.0). Add the following bindingRedirect element to the Web.config file in the application root under the configuraton section: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/> <bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0"/> </dependentAssembly> </assemblyBinding> </runtime> Create a new ASP.NET MVC 2 application. Copy the files from the Scripts directory of the new application into the Scripts directory of the existing application. Compile the application and run it. If any errors occur, refer to the Breaking Changes section of this document for possible solutions. New Features This section describes features that have been introduced in the ASP.NET MVC 2 Release Candidate release. ASP.NET MVC validation scripts have been moved to their own file To help reduce conflicts with other Ajax libraries, the built-in ASP.NET MVC validation scripts are now in a separate JavaScript file. ASP.NET MVC validation scripts can be included at the top or bottom of a page The server component that renders the client validation metadata now renders the metadata into a JavaScript variable. This allows the validation scripts to be included either at the top of the page or at the bottom, because the scripts will look for the variable and load the metadata when it is available. ASP.NET MVC validation scripts support globalization When the required ASP.NET Ajax globalization scripts are included in a page, the validation logic uses the culture-specific data for data types (such as dates and numbers) when it validates input text. The new Html.GlobalizationScript helper method can be used to render a reference to the globalization script for the current culture. Html.ValidationSummary helper method can display model-level errors Instead of always displaying all validation errors, the Html.ValidationSummary helper method has a new option to display only model-level errors. This enables model-level errors to be displayed in the validation summary and field-specific errors next to each field. T4 templates in Visual Studio generate code that is specific to the target version of the .NET Framework A new property is available to T4 files from the ASP.NET MVC T4 host that specifies the version of the .NET Framework that is used by the application. This allows T4 templates to generate code and markup that is specific to a version of the .NET Framework. In Visual Studio 2008, the value is always .NET 3.5. In Visual Studio 2010, the value is either .NET 3.5 or .NET 4. Other Improvements The following additional changes have been made to existing types and members for the ASP.NET MVC 2 Release Candidate release. The default HTML markup that is generated by the Add View dialog box has been changed to be consistent with the markup that is rendered by the templated helpers (Editor, EditorFor, Display, and DisplayFor). Buttons in a form can specify that they do not cause validation logic to run. The default is that every button in a form causes validation logic to run, and if validation fails, the validation logic blocks submission of the form. Enabling validation selectively for buttons lets you create forms that can post information even if a form is not complete or if the form contains data that is temporarily invalid. Client validators can specify when they run. Possible values are input (while the user is typing), blur (after the user is done typing and moves to another field), and submit (when the user submits the form). Bug Fixes The following bugs have been fixed in the ASP.NET MVC 2 Release Candidate release. The FileResult action result now supports non-US-ASCII characters in file names. Methods and properties of the TempDataDictionary class have been improved to better handle the case when items are flagged for removal from the dictionary. Support for validation in the IDataErrorInfo interface has been fixed. Breaking Changes The following changes might cause errors in existing ASP.NET MVC 1.0 applications. Changes in ASP.NET MVC 2 Release Candidate IIS script mapping script is no longer available in the installer The IIS script mapping script is a command-line script that is used to configure script maps for IIS 6 and for IIS 7 in Classic mode. The script-mapping script is not needed if you use the Visual Studio Development Server or if you use IIS 7 in Integrated mode. The scripts are available as a separate unsupported download on the ASP.NET CodePlex site. The Html.Substitute helper method in MVC Futures is no longer available Due to changes in the rendering behavior of MVC view engines, the Html.Substitute helper method does not work and has been removed. Changes in ASP.NET MVC 2 Beta The IValueProvider interface replaces all uses of IDictionary<string, ValueProviderResult> Every property or method argument that accepted IDictionary<string, ValueProviderResult> now accepts IValueProvider. This change affects only applications that include custom value providers or custom model binders. Examples of properties and methods that are affected by this change include the following: The ValueProvider property of the ControllerBase and ModelBindingContext classes. The TryUpdateModel methods of the Controller class. New CSS classes were added in the Site.css file that are used to style validation messages. Changes in ASP.NET MVC 2 Preview 2 Helpers now return an MvcHtmlString object In order to take advantage of the new HTML-encoding expression syntax in ASP.NET 4, the return type for HTML helpers is now MvcHtmlString instead of a string. Note that if you use ASP.NET MVC 2 and the new helpers with ASP.NET 3.5, you will not be able to take advantage of the HTML-encoding syntax; the new syntax is available only when you run ASP.NET MVC 2 on ASP.NET 4. JsonResult now responds only to HTTP POST requests In order to mitigate JSON hijacking attacks that have the potential for information disclosure, by default, the JsonResult class now responds only to HTTP POST requests. Ajax GET calls to action methods that return a JsonResult object should be changed to use POST instead. If necessary, you can override this behavior by setting the new JsonRequestBehavior property of JsonResult. For more information about the potential exploit, see the blog post JSON Hijacking on Phil Haack’s blog. Model and ModelType property setters on ModelBindingContext are obsolete A new settable ModelMetadata property has been added to the ModelBindingContext class. The new property encapsulates both the Model and the ModelType properties. Although the Model and ModelType properties are obsolete, for backward compatibility the property getters still work; they delegate to the ModelMetadata property to retrieve the value. Changes in ASP.NET MVC 2 Preview 1 Changes to the DefaultControllerFactory class break custom controller factories that derive from it The DefaultControllerFactory class was fixed by removing the RequestContext property. In place of this property, the request context instance is passed to the protected virtual GetControllerInstance and GetControllerType methods. This change affects custom controller factories that derive from DefaultControllerFactory. Custom controller factories are often used to provide dependency injection for ASP.NET MVC applications. To update the custom controller factories to support ASP.NET MVC 2, change the method signature or signatures to match the new signatures, and use the request context parameter instead of the property. “Area” is a now a reserved route-value key The string “area” in Route values now has special meaning in ASP.NET MVC, in the same way that “controller” and “action” do. One implication is that if HTML helpers are supplied with a route-value dictionary containing “area”, the helpers will no longer append “area” in the query string. If you are using the Areas feature, make sure to not use {area} as part of your route URL. Known Issues Adding a debugger watch that shows a value from TempData will mark it for deletion. The side effect was introduced as part of the changes to TempDataDictionary. Disclaimer This is a preliminary document and may be changed substantially prior to final commercial release of the software described herein. The information contained in this document represents the current view of Microsoft Corporation on the issues discussed as of the date of publication. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information presented after the date of publication. This White Paper is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS DOCUMENT. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced, stored in or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of Microsoft Corporation. Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from Microsoft, the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Unless otherwise noted, the example companies, organizations, products, domain names, e-mail addresses, logos, people, places and events depicted herein are fictitious, and no association with any real company, organization, product, domain name, email address, logo, person, place or event is intended or should be inferred. © 2009 Microsoft Corporation. All rights reserved. Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners.
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