如何仅返回条件上的特定对象列表基础

Question

我想为返回选定的对象列表添加条件。如果情况满足条件，则如果该项目的类别是此示例，则不会返回该项目，类别为3。

这是查询：

var objectQuery = query
    .ToList()
    .Select(a => new
    {
        a.Id,
        ObjectDetails = (new ObjectClass[] { })
            .Concat(...)
            .Concat(...)
            .Distinct()
            .Select(f => new
            {
                f.ObjectDetails.Id,
                f.ObjectDetails.Name,
                f.ObjectDetails.DisplayName,
                category = (int)f.ObjectDetails.Category,
                f.ObjectDetails.IsArchived,
            })
    });

return objectQuery.ToList().FirstOrDefault();

我想添加这样的条件使用类别3并返回所有项目（如果没有），但是我不知道如何正确实施它：

if(condition a)
    return objectQuery.Select(...Where(category != 3)).ToList().FirstOrDefault();
else
    return objectQuery.ToList().FirstOrDefault();

这是回报输出：

{
  "objectQuery": {
    "id": 1198,
    "ObjectDetails": [
      {
        "id": 1,
        "name": "name one",
        "displayName": "NAME 1",
        "Category": 1,
      },
      {
        "id": 2,
        "name": "name two",
        "displayName": "NAME 2",
        "Category": 1,
      },
      {
        "id": 3,
        "name": "name three",
        "displayName": "NAME 3",
        "Category": 2,
      },
      {
        "id": 4,
        "name": "name four",
        "displayName": "NAME 4",
        "Category": 2,
      },
      {
        "id": 5,
        "name": "name five",
        "displayName": "NAME 5",
        "Category": 3,
      },
      {
        "id": 6,
        "name": "name six",
        "displayName": "NAME 6",
        "Category": 1,
      },
      {
        "id": 7,
        "name": "name seven",
        "displayName": "NAME 7",
        "Category": 1,
      }
    ]
  }
}

Answer 1

如果我正确地得到您的问题，那么您将需要类似的问题：

var objectQuery = query
    .ToList()
    .Select(a => new
    {
        a.Id,
        ObjectDetails = (new ObjectClass[] { })
            .Concat(...)
            .Concat(...)
            .Distinct()
            .Select(f => new
            {
                f.ObjectDetails.Id,
                f.ObjectDetails.Name,
                f.ObjectDetails.DisplayName,
                category = (int)f.ObjectDetails.Category,
                f.ObjectDetails.IsArchived,
            })
            .Where(f => !condition || f.category != 3)
    });

return objectQuery.ToList().FirstOrDefault();