Next and Previous buttons not displayed when there are more than 4 posts

[wpqs]

When you have more the 4 posts the home page should show a summary of the latest four and display a previous button so that the user can navigate to the earlier posts (assuming of course that your appsettings.json has blog:postsPerPage=4). Unfortunately, the previous button doesn't appear.

There seems to be a bug in views\blog\index.cshtml

@{
    int currentPage = int.Parse(ViewContext.RouteData.Values[Constants.page] as string ?? "0");

    int pageCount;
    pageCount = int.TryParse(ViewData[Constants.TotalPostCount].ToString(), out pageCount) ? 0 : pageCount / 2;
}

When int.TryParse() succeeds pageCount is zero, and when it fails pageCount is zero/2. Therefore I propose the following fix:

1. Add to Constants.cs

public static readonly string PostsPerPage = "PostsPerPage";

2. Update BlogController.Index() and BlogController.Category()

this.ViewData[Constants.PostsPerPage] = this.settings.Value.PostsPerPage;

3. Change Index.cshtml

    int currentPage = int.Parse(ViewContext.RouteData.Values[Constants.page] as string ?? "0");

	int postsPerPage;
	postsPerPage = (int.TryParse(ViewData[Constants.PostsPerPage].ToString(), out postsPerPage) && (postsPerPage > 0)) ? postsPerPage : 4;
    int pageCount;
    pageCount = int.TryParse(ViewData[Constants.TotalPostCount].ToString(), out pageCount) ? pageCount / postsPerPage : 0;