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asp.net core - how to get IUrlHelper from inside Html helper - Stack Overflow[^]
Correcting the typo in that answer gives:
public static IHtmlContent CHGridTable<TModel>(this IHtmlHelper<TModel> htmlHelper, DataTable dt, object htmlAttributes = null)
{
var urlHelperFactory = (IUrlHelperFactory)htmlHelper.ViewContext.HttpContext.RequestServices.GetService(typeof(IUrlHelperFactory));
var urlHelper = urlHelperFactory.GetUrlHelper(htmlHelper.ViewContext);
string urlEdit = url.RouteUrl("Default");
...
}
You might also want to consider whether a custom tag helper might be a better choice for what you're trying to do:
Tag Helpers in ASP.NET Core | Microsoft Docs[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thanks, I corrected error in my custom helper, but when I call the helper from views as following:
@HtmlHelperExt.CHGridTable(Model, new { tablename = "tblTest", defaultcolsort = "3" })
and got following error:
Error CS0411 The type arguments for method 'HtmlHelperExt.CHGridTable<TModel>(HtmlHelper<TModel>, DataTable, object)' cannot be inferred from the usage. Try specifying the type arguments explicitly.
The call on MVC5 works file, How can I use the custom helper on view of Core Web Application (MVC6):
The custom helper code as following:
public static IHtmlContent CHGridTable<tmodel>(this HtmlHelper<tmodel> htmlHelper, DataTable dt, object htmlAttributes = null)
{
var urlHelperFactory = (IUrlHelperFactory)htmlHelper.ViewContext.HttpContext.RequestServices.GetService(typeof(IUrlHelperFactory));
var url = urlHelperFactory.GetUrlHelper(htmlHelper.ViewContext);
......
return new HtmlString(tbBtnAdd.ToString() + tbGridTable.ToString() + script.ToString());
}
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JimFeng wrote: @HtmlHelperExt.CHGridTable(Model, new { tablename = "tblTest", defaultcolsort = "3" })
That should probably be:
@Html.CHGridTable(Model, new { tablename = "tblTest", defaultcolsort = "3" })
You need to call it as an extension method on the IHtmlHelper instance, not call the static method directly.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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@Html.CHGridTable(......) works on MVC5 but not ASP.NET Core MVC.
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I added @addTagHelper *, HtmlHelperExt in _ViewImports.cshtml file but still got error:
Error: CS1061 'IHtmlHelper<dataset>' does not contain a definition for 'CHDropdownMenu' and no accessible extension method 'CHDropdownMenu' accepting a first argument of type 'IHtmlHelper<dataset>' could be found (are you missing a using directive or an assembly reference?)
on the View page like this (the same as on MVC 5):
@model System.Data.DataSet
@using HtmlHelperExt;
......
@Html.CHDropdownMenu(Model, "mnuSample1", new { MenuOpenType = "Hover" })
......
My Custom helper like this:
namespace HtmlHelperExt
{
public static class HtmlHelperExt
{
public static IHtmlContent CHDropdownMenu<tmodel>(this HtmlHelper<tmodel> htmlHelper, DataSet ds, string divID, object htmlAttributes = null)
{
......
return new HtmlString(tbDiv_Menu.ToString());
}
}
}
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JimFeng wrote: IHtmlHelper<dataset>' does not contain a definition for 'CHDropdownMenu'
CHDropdownMenu<tmodel>(this HtmlHelper<tmodel> htmlHelper,
You need to declare the helper method as an extension method against the IHtmlHelper interface, not the HtmlHelper class.
public static IHtmlContent CHDropdownMenu<TModel>(this IHtmlHelper<TModel> htmlHelper, ...
IHtmlHelper Interface (Microsoft.AspNetCore.Mvc.Rendering) | Microsoft Docs[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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My assembly is a custom HtmlHelper NOT TagHelper.
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Yes, of course. 
You'll want @using statements for your namespace, rather than @addTagHelper statements. Still in the _ViewImports.cshml file, though.
@using HtmlHelperExt
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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@using HtmlHelperExt is already in the _ViewImports.cshml, but got the same error.
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Did you change the first parameter of the extension method, as I suggested yesterday?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you Rick, after I changed the parm type, and the helper works in my ASP.NET Core 2.1 MVC app.
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Hi All,
My application is build in framework 3.5 and now i m converting into 4.5. Here is the code.
Response.Redirect(Request.ApplicationPath + path, true);
While converting this line to 4.5, i m getting "\" in Request.ApplicationPath. But i need application path.
Please anyone tell me why i m getting the "\" insider of the application path.
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If you don't want the "\" then remove it using TrimStart or TrimEnd depending where you want to remove it from.
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Hi,
Getting "\" is not a problem. Insider of getting "\", i need application path.
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What is your definition of the "application path"?
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"Website path" means nothing on its own, give me an example. What would the "website path" be for http://www.mysite.com/somefolder/page.aspx?param=1
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In my local
http://localhost:1234/Admin/Home.aspx
Response.Redirect(Request.applicationpath + "Admin/Home.aspx")
Here Request.applicationpath returns "\"
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See the first link in the search link I gave you below. But you have still not answered FE's question.
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Thanks a lot for your valuable time. It is working fine. Made a changes based on your search result.
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Thank you. It is working fine.
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Hi,
I have code as below, which loads a partial view in which I have a Grid, but for some reason when one of the load doesn't happen because some failure or missing View etc, the previous partial view remaining unchanged, can somebody please help me how can I clear the previous page load when loading the current Page. Any help a code snippet, a link or a suggestion anything helps thanks a lot in advance my friends.
function GetLookupTableValue(e)
{<br />
if ($("#drpLookup").data("kendoDropDownList").text() != 'Select')
myHeader.innerText = "List of " + $("#drpLookup").data("kendoDropDownList").text();
else
myHeader.innerText = "";
var noCodeFilter = containsAny($("#drpLookup").data("kendoDropDownList").text(), ['Address Type', 'Gender', 'NPI Status', 'Rendering Provider Status', 'Rendering Provider Classification']);
if (noCodeFilter)
{
var url = '../Admin/GetLookupTableNoCode';
$("#divLookupTable").load(url, { LookupTableId: $("#drpLookup").data("kendoDropDownList").value(), __RequestVerificationToken: $('input[name=__RequestVerificationToken]').val() });
}
else if ($("#drpLookup").data("kendoDropDownList").text() == 'Medi-Cal - Mode of Service - Service Function')
{
var url = '../Admin/GetMCMSSFCrosswalkList';
$("#divLookupTable").load(url, { LookupTableId: $("#drpLookup").data("kendoDropDownList").value(), __RequestVerificationToken: $('input[name=__RequestVerificationToken]').val() });
}
else if ($("#drpLookup").data("kendoDropDownList").text() == 'Service Function Category')
{
var url = '../Admin/GetServiceFunctionCategoryLKPList';
$("#divLookupTable").load(url, { LookupTableId: $("#drpLookup").data("kendoDropDownList").value(), __RequestVerificationToken: $('input[name=__RequestVerificationToken]').val() });
}
else
{
var url = '../Admin/GetLookupTableCode';
$("#divLookupTable").load(url, { LookupTableId: $("#drpLookup").data("kendoDropDownList").value(), __RequestVerificationToken: $('input[name=__RequestVerificationToken]').val() });
}
}
Thanks,
Abdul Aleem
"There is already enough hatred in the world lets spread love, compassion and affection."
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