c# - Group items in collection by first letter -


i have collection of brands, returns ienumerable , have grouped brands first letter.

@{     var brands = service.getbrands();      <div class="list">     @foreach (var brand in brands.groupby(x => x.substring(0, 1).toupper(), (alphabet, sublist) => new { alphabet = alphabet, sublist = sublist.orderby(x => x).tolist() }).orderby(x => x.alphabet))     {          <h4 class="letter">@brand.alphabet</h4>          <div class="row">             @foreach (var item in brand.sublist)             {                 <div class="brand col-md-3">                     <div class="brand__title">@item</div>                 </div>             }             </div>     }     </div> }

which render following:

enter image description here

but in case no brands starts e.g. letter b, how can render letters a-z? can somehow join array alphabet property?

char[] letterarray = "abcdefghijklmnopqrstuvwxyzÆØÅ".tochararray();

furthermore can group brands starting number in "0-9"-group?

what this?

char[] alphabet = "abcdefghijklmnopqrstuvwxyz".tochararray(); var brands = service.getbrands(); var numberbrands = brands.where(x => char.isdigit(x.first()));  <h4 class="letter">0-9<h4>       <div class="row">         @foreach(var brand in numberbrands){             <div class="brand col-md-3">                 <div class="brand__title">@brand</div>             </div>         }     </div>  foreach(var letter in alphabet){     var subbrands = brands.where(x =>      x.startswith(letter.tostring(), stringcomparison.ordinalignorecase))     .orderby(x => x);      <h4 class="letter">@letter<h4>       <div class="row">         @foreach(var brand in subbrands){             <div class="brand col-md-3">                 <div class="brand__title">@brand</div>             </div>         }      </div> }

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