関連ワード:  must be set in object initializer or attribute constructor    required member must be set in object initializer or attribute constructor    c# must be set in the object initializer or attribute constructor    required member must be set in the object initializer or attribute constructor c#    required member must be set in the object initializer or attribute constructor cs9035    error cs9035 required member must be set in the object initializer or attribute constructor    object vs constructor  
結果 : must be set in object initializer or attribute constructor