Why are struct constructors in C# required to have at least one argument?
The .NET runtime can’t guarantee that parameterless constructors will be called. If structs where to allow default, parameterless constructors, it would imply that these default constructors would *always* be called. However, the runtime can not make this guarantee. For example an array of value types will be initialized to the initial values of its members (i.e. 0 for number type primitive members, null for reference types etc) not to the values provided in a default constructor – which makes structs better performing by not having to call constructor code. Enforcing a minimum of one parameter in the constructor reduces the possibility that someone will define a constructor that they then expect to be called every time one of their struct types is constructed.
