Author Archives: AJ Kerezstes

Token Based Authentication Using Asp.Net Core 2.0

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ASP.Net Core 2.0 came out recently and there were quite a few changes to the authentication scheme.  In this article, I’ll talk about how to setup token based authentication using JWT’s in ASP.Net Core 2.0.  We’ll use the Identity system to handle authentication, and Entity Framework to access an MS SQL backend.  NOTE: you will probably need to install the .Net Core 2.0 Libraries.

The source code for this can be found here. Read more

Token Based Authentication in ASP.Net using JWTs Part 1

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Lately, I’ve been doing quite a bit of front-end development with the latest version of Angular and that requires token based authentication. So in this article let’s discuss how to create tokens in .Net.  I’ll go over setting up tokens in regular .Net, and in a later article, I’ll discuss how to setup tokens in .Net core.

All of the code can be obtained from Github Here.

Read more

Evaluating HTML5/Angular Data Grid

misc1I’m implementing sorting, filtering, and grouping for a data set to allow business users to look at information in various ways for more comprehensive data analysis. By using a pre-built component, time is saved by reducing development time for implementing the feature.  This is replaced by configuring and adding logic for the grid to work. I tried out a few different data grids to see how they might meet my needs:

UI-grid

  • Control selected/displayed columns
    • Must manually load / save user selected columns (implemented on other tables)
  • Column Filtering
    • If we limit the result set and do NOT use pagination, then we can use filters inside the grid:
      • Supports less-than and greater-than — need to be in separate inputs
      • Dates need to be typed in by hand (and need to specify format) or create a custom date filter
  • Saving/Loading Filters     
    • The filters store the column data like “grid.column[i].filters[0]” so it would be pretty easy to store that data to a database and then pre-populate back
  • Exporting
  • Pagination
    • Painful but possible with the filters and just passing them to the server and handling them individually
  • Printing
    • Export to pdf and print


Dev Express Grid

  • Control selected/displayed columns
    • This will be a manual process as well (combining this with the ‘visible’ properties on the columns)
  • Column Filtering
    • Again, we would want to NOT use pagination and just limit the result set
    • Contains built-in equality operators
  • Saving/Loading Filters
    • I’m having difficulty finding out how to do this.  It seems that this is close
  • Exporting
  • Pagination
    • They only have simple pagination samples, none containing filters
  • Printing
    • Export to excel and print
    • Export to pdf on server (or client)

Telerik KendoUI DataGrid

Note: although this seems like a fully-functional datagrid, it’s hard to find examples for angularjs.  It seems most are plain javascript.

  • Control Selected/Displayed columns
    • Must be handled manually (like all others)
  • Column Filtering
  • Saving/loading filters
  • Exporting:
    • Exports to PDF
    • Exports to Excel
  • Pagination
    • They only have simple pagination samples, none containing filters
  • Printing
    • Export to pdf and open then print

 

Printing seems to be the biggest issue across all three of these data grids. UI-Grid can do CSV and pdf in Chrome, DevX Grid can do Excel only). Up next, I’m looking to do the following:

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