If you know how many times you want to loop, you can use a for loop. This kind of loop is especially useful for counting up or counting down:. A collection is a group of similar objects, and the for each loop lets you carry out a task on each item. The for each loop walks through a collection until it is finished. A while loop begins with the while keyword, followed by parentheses, where you specify how long the loop continues, then a block to repeat. An array is useful when you want to store similar variables but don't want to create a separate variable for each of them:.
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There are many situations where I want to quickly iterate through a bunch of items in a view, and I prefer using the foreach statement. But sometimes, I need to also know the current index.
Notice that we pass in Razor markup as an argument to the method which gets called for each item. We have access to the direct item and the current index.
ASP.NET MVC - Razor
If you want to try it out, I put the code in a package in my personal NuGet feed for my code samples. Maytbe a better approach?
Sorry don't have MVC installed on this machine but I think you get the idea. ItemIndex Console. WriteLine item. Value, entry. Index, entry. Personal NuGet stream? Please share on how to get one. Me wants one for my own Also a better alternative to SVN externals! ElementAt i is not the best choice.
Depending on implementation it might reiterate the whole thing from the start over and over again. I think it's better to use foreach and maintain the current position. Isnt this going to be an exponential iteration if the enumerable. Count will need to enumerate all items, then ElementAt will probably also need to so the same thing for every single element.
I was looking for this solution and posted a question in stackoverflow. Then I read an article on your site about delegate usage in razor.Just as it is possible to nest MasterPages, it is also possible to nest Razor Layout pages. You would consider using nested layout pages if you were building a corporate site for a global company, for instance, which is comprised on many divisions, each having their own look and feel.
There may be a common look and feel for the header and footer of the site, but the navigation and content changes in both structure and appearance depending on which division of the company is being featured.
The imaginary company that the sample site relates to has a number of divisions, one of which is Automation and another for Electronics. Each of them has their own branding which needs ot be catered for. For simplicity's sake the following walkthrough illustrates the use of Razor in a Web Pages site built using WebMatrix, but the principals are exactly the same if you are using ASP. Add two folders to the site — one called Content and the other called Shared.
Change the existing code so that it looks like this:. Replace the existing code with this:. Name this one Automation. Replace the existing code with the following:. Making sure that the Electronics page is selected in the left pane, click the Run button to launch the page in your browser. Notice that the second navigation has a white background and the main area has a blue background. Click the Automation link in the top navigation. See how the colours change? The main content is a brownish-pink colour as is the secondary navigation.
The heading in the main content area changes colour too. Most obviously, the Electronics navigation is displayed vertically whereas the Automation navigation is horizontal. What defines a Layout page is a call to the RenderBody method. You also added calls to RenderBody in both of those files, thus turning them into layout pages.
There is no limit to the number of levels to which you can nest layout pages. A small sample containing the code in full can be downloaded here.
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I want to loop through each item in my model in my razor view but I want to group all items together. I then want to loop through each group.
Imagine I have a table:. Yes, this is easy to do using the Linq GroupBy. Then, simply iterate through the group as you wrote, except using group. Key instead of group. GroupNo to retrieve IGrouping's key:. Learn more. Looping through models content in Razor Ask Question. Asked 7 years, 5 months ago. Active 2 days ago. Viewed 38k times. McGarnagle Rodders Rodders 2, 2 2 gold badges 14 14 silver badges 31 31 bronze badges. Have you actually tried to give your model data structures that would match what your at a first glance valid Razor code expects?
Active Oldest Votes. ToArray ; return View groupModel ; Then, simply iterate through the group as you wrote, except using group.In this chapter, we will look at the Razor view engine in ASP. Razor is a markup syntax that lets you embed server-based code into web pages using C and VB. It is not a programming language. It is a server side markup language. Razor has no ties to ASP. You can use it anywhere to generate output like HTML.
It's just that ASP. You will have a template file that's a mix of some literal text and some blocks of code. You combine that template with some data or a specific model where the template specifies where the data is supposed to appear, and then you execute the template to generate your output. Razor is very similar to how ASPX files work. ASPX files are templates, which contain literal text and some C code that specifies where your data should appear.
We execute those to generate the HTML for our application. Razor has no such dependencies. Microsoft wanted Razor to be easy to use and easy to learn, and work inside of tools like Visual Studio so that IntelliSense is available, the debugger is available, but they wanted Razor to have no ties to a specific technology, like ASP.
Microsoft wanted Razor to be smart, to make a developer's job easier. This is our HTML markup. It also contains little bits of C code. You are also prompted by IntelliSense to do things that just don't make sense in an MVC project, like add directives for output caching and user controls into an ASPX view. Now look at this code which produces the same output, the difference being it is using the Razor syntax. But when we're finished with the foreach statement and we have our opening curly brace, we can transition from C code into HTML without putting an explicit token in there, like the percent in the angle bracket signs.
If you compare these two blocks of code, I think you'll agree that the Razor version is easier to read and easier to write. It will create a basic MVC project with minimal predefined content. Once the project is created by Visual Studio, you will see a number of files and folders displayed in the Solution Explorer window. As we have created ASP. Net MVC project from an empty project template, so at the moment the application does not contain anything to run.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It saying the item variable does not exist in that case. I believe what you want it is.
Learn more. Asked 4 years, 1 month ago. Active 4 years ago. Viewed 3k times. I am just started to learn Razor and have a question regarding nested loops. It renders everything correctly using the following code foreach var group in Model. I think that's because if you add markup you need to add the " " symbol to the second foreach too. Active Oldest Votes. I believe what you want it is foreach var group in Model. Travis Travis 9, 1 1 gold badge 24 24 silver badges 46 46 bronze badges. Thank you.
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This articles focuses on using the C programming language. This section lists a few tips that you absolutely need to know as you start writing ASP. NET server code using the Razor syntax. The Razor syntax is based on the C programming language, and that's the language that's used most often with ASP.
NET Web Pages. However, the Razor syntax also supports the Visual Basic language, and everything you see you can also do in Visual Basic. For details, see the appendix Visual Basic Language and Syntax. The character starts inline expressions, single statement blocks, and multi-statement blocks:. When you display content in a page using the character, as in the preceding examples, ASP. Without HTML encoding, the output from your server code might not display correctly, and could expose a page to security risks.
Inside a code block, each complete code statement must end with a semicolon. Inline expressions don't end with a semicolon. You can store values in a variableincluding strings, numbers, and dates, etc.
You create a new variable using the var keyword. You can insert variable values directly in a page using. A string is a sequence of characters that are treated as text.
To specify a string, you enclose it in double quotation marks:. Notice that the character is used both to mark verbatim string literals in C and to mark code in ASP. NET pages.