Update the property of a struct within a List in C# -

i have list<cat> cat struct has id , name.

how change name of cat id 7?

i did (without thinking)

var mycat = catlist.single(c => c.id == 7);  mycat.name = "dr fluffykins"; 

but of course, structs value types. possible use technique this, or have change .single for loop , store index replace updated struct?

since structs value types, , because value types copied, mycat ends copy of cat list. need operate on struct itself, not copy.

moreover, can modify fields of structs directly when single variables or parts of array. list<t>'s indexer returns copy, c# compiler produces "cannot modify value type" error.

the solution know (short of making cat class or re-assigning modified copy) making catlist array:

var indexof = catarray     .select((cat, index) => new {cat, index})     .single(p => p.cat.id == 7).index; catarray[indexof].name = "dr fluffykins";