CS0103 This name '' does not exist in the current context-CodePudding

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.

CodePudding user response：

TagBuilder result = new TagBuilder("div"); should go outside the for loop:

public override void Process(TagHelperContext context,
    TagHelperOutput output)
{
    TagBuilder result = new TagBuilder("div");

    if (ViewContext != null && PageModel != null)
    {
        IUrlHelper urlHelper = urlHelperFactory.GetUrlHelper(ViewContext);
        
        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);
}

CodePudding user response：

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.