Rename PartialTagHelper `asp-for` to `for`.

#7379

src/Microsoft.AspNetCore.Mvc.TagHelpers/PartialTagHelper.cs

@@ -20,7 +20,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
     [HtmlTargetElement("partial", Attributes = "name", TagStructure = TagStructure.WithoutEndTag)]
     public class PartialTagHelper : TagHelper
     {
-        private const string ForAttributeName = "asp-for";
         private readonly ICompositeViewEngine _viewEngine;
         private readonly IViewBufferScope _viewBufferScope;
 
@@ -40,7 +39,6 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
         /// <summary>
         /// An expression to be evaluated against the current model.
         /// </summary>
-        [HtmlAttributeName(ForAttributeName)]
         public ModelExpression For { get; set; }
 
         /// <summary>
@@ -102,7 +100,7 @@ namespace Microsoft.AspNetCore.Mvc.TagHelpers
             // Determine which ViewData we should use to construct a new ViewData
             var baseViewData = ViewData ?? ViewContext.ViewData;
 
-            // Use the rendering View's model only if an asp-for expression does not exist
+            // Use the rendering View's model only if an for expression does not exist
             var model = For != null ? For.Model : ViewContext.ViewData.Model;
             var newViewData = new ViewDataDictionary<object>(baseViewData, model);
             var partialViewContext = new ViewContext(ViewContext, view, newViewData, writer);

test/WebSites/HtmlGenerationWebSite/Views/HtmlGeneration_Home/ProductListUsingTagHelpers.cshtml

@@ -1,4 +1,4 @@
-@using HtmlGenerationWebSite.Models
+@using HtmlGenerationWebSite.Models
 @model IList<Product>
 
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@@ -15,7 +15,7 @@
                 <label asp-for="@Model[i].HomePage" class="product"></label>
                 <input asp-for="@Model[i].HomePage" type="url" size="50" disabled="disabled" readonly="readonly" />
             </div>
-            <partial name="_ProductPartial" asp-for="@Model[i]" />
+            <partial name="_ProductPartial" for="@Model[i]" />
         }
         @* Print the HtmlFieldPrefix outside of the partial tag helper to ensure it hasn't been modified *@
         <div>HtmlFieldPrefix = @ViewData.TemplateInfo.HtmlFieldPrefix</div>

test/WebSites/HtmlGenerationWebSite/Views/HtmlGeneration_Home/Warehouse.cshtml

@@ -2,4 +2,4 @@
 @addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
 
 <h3>@Html.DisplayFor(m => m.City)</h3>
-<partial name="_EmployeePartial" asp-for="Employee" />
+<partial name="_EmployeePartial" for="Employee" />