ASP.NET MVC3 - Usage of Html.ActionLink

Question

I need to use the Html.ActionLink in the format: property of the grid.Column specification. My code goes as below:

grid.GetHtml(

  grid.Columns( 
    grid.Column(header: "Column 1", format: (item) => @<div class='webgrid-bookname-column-style'> @item.BookName </div>),
    grid.Column(header: "Column 2", format: (item) => Html.ActionLink(item.StartTime, "ShowShippingFileMessage", new { @id = item.BookName }))
  )
)

When I use this syntax, it gives me the compilation error of The best overloaded method match for System.Web.Helpers.WebGrid.Column(string, string, System.Func<dynamic,object>, string, bool) has some invalid arguments When I change the item.StartTime above with a normal text like "Edit" then it works fine.

I am new to ASP.NET, can anyone please help me understand what is wrong with the above statements?

Thanks in advance.

SLaks · Accepted Answer · 2011-11-01 01:21:23Z

1

The format parameter is of type Func<dynamic, HelperResult>.
It must return a HelperResult, not an IHtmlString.
It is defined this way to allow you to pass an inline helper.
To pass an inline helper, remove (item) =>; inline helpers implicitly generate a lambda expression with an item parameter.
To pass a normal lambda expression, you need to make it return a HelperResult instance.
HelperResults take an Action<TextWriter>, so you would write

~~item => new HelperResult(w => w.Write(Html.ActionLink(...).ToHtmlString()))~~

EDIT: I hadn't realized that the parameter is declared as Func<dynamic, object>. That means you can either pass an inline helper or any other lambda expression.
Your second example ought to work.

You can also use an inline helper. To do that without an HTML tag, use the special <text> tag:

item => @<text>@Html.ActionLink(...)</text>

Razor will drop the <text> from the output.

edited Nov 1, 2011 at 1:21

answered Nov 1, 2011 at 0:38

SLaks

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7 Comments

VBK Over a year ago

Thanks for your quick response. I tried both the options but it did not help. I am still getting the same error.

VBK Over a year ago

It is the same error message. Did not change ---- CS1502: The best overloaded method match for 'System.Web.Helpers.WebGrid.Column(string, string, System.Func<dynamic,object>, string, bool)' has some invalid arguments

VBK Over a year ago

I am not sure if I understand your question. But this is what I get from the web page --------------------------------\Index.cshtml(96,17): error CS1502: The best overloaded method match for 'System.Web.Helpers.WebGrid.Column(string, string, System.Func<dynamic,object>, string, bool)' has some invalid arguments \Index.cshtml(98,27): error CS1503: Argument 3: cannot convert from 'lambda expression' to 'System.Func<dynamic,object>'

SLaks Over a year ago

That usually means you have some syntax error in your lambda.

SLaks Over a year ago

Try new { id = (string)item.BookName }

|

amesh · Accepted Answer · 2012-10-15 04:04:23Z

0

The display string you are passing is of the type DateTime. Try giving String Input.

grid.Column(header: "Column 2", format: (item) => Html.ActionLink(item.StartTime.ToString(), "ShowShippingFileMessage", new { @id = item.BookName }))

answered Oct 15, 2012 at 4:04

amesh

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