CS0103 This name '' does not exist in the current context - asp.net-core

Question

I've got this class:
public override void Process(TagHelperContext context,
TagHelperOutput output)
{
if (ViewContext != null && PageModel != null)
{
IUrlHelper urlHelper = urlHelperFactory.GetUrlHelper(ViewContext);
TagBuilder result = new TagBuilder("div");
for (int i = 1; i <= PageModel.TotalPages; i++)
{
TagBuilder tag = new TagBuilder("a");
tag.Attributes["href"] = urlHelper.Action(PageAction,
new { productPage = i });
}
tag.InnerHtml.Append(i.ToString());
result.InnerHtml.AppendHtml(tag);
}
output.Content.AppendHtml(result.InnerHtml);
}
However, the 'tag', 'i' and 'result' attributes after the for-loop don't fall in the scope, which shouldn't be the matter if I'm correct. I'm using VS2022 with SDK version 6.0.402.

Answer 1

I'm not sure what you want in the end, but one thing you should pay attention to is that variables defined in a for loop can only be used in a for loop, and variables defined in an if can only be used in an if.
So tag.InnerHtml.Append(i.ToString()); can only be used in a for loop, unless you define an i outside the for loop. Like this:
int k = 0;
for (int i = 1; i <= PageModel.TotalPages; i++)
{
k=i;//The final value of k is PageModel.TotalPages.Count
}
tag.InnerHtml.Append(k.ToString());
If you want to add all i in TagBuilder tag, then it should be like this:
public override void Process(TagHelperContext context,
TagHelperOutput output)
{
TagBuilder result = new TagBuilder("div");
if (ViewContext != null && PageModel != null)
{
IUrlHelper urlHelper = urlHelperFactory.GetUrlHelper(ViewContext);
TagBuilder tag = new TagBuilder("a");
for (int i = 1; i <= PageModel.TotalPages; i++)
{
tag.Attributes["href"] = urlHelper.Action(PageAction,
new { productPage = i });
tag.InnerHtml.Append(i.ToString());
}
result.InnerHtml.AppendHtml(tag);
}
output.Content.AppendHtml(result.InnerHtml);
}
If you only want to add the last entry of PageModel.TotalPages in the TagBuilder tag, it should be like this:
public override void Process(TagHelperContext context,
TagHelperOutput output)
{
TagBuilder result = new TagBuilder("div");
if (ViewContext != null && PageModel != null)
{
IUrlHelper urlHelper = UrlHelperFactory.GetUrlHelper(ViewContext);
TagBuilder tag = new TagBuilder("a");
for (int i = 1; i <= PageModel.TotalPages; i++)
{
tag = new TagBuilder("a");
tag.Attributes["href"] = urlHelper.Action(PageAction,
new { productPage = i });
tag.InnerHtml.Append(i.ToString());
}
result.InnerHtml.AppendHtml(tag);
}
output.Content.AppendHtml(result.InnerHtml);
}
Hope this can help you.