C# MongoDb CSharp驱动程序：选择字段X所在的行（val1、val2、val3）

试试这个

Select * From Post Where Id In(1, 2, 3)

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我认为您可以在过滤器中使用以下内容：

var Ids = new int[] { 1, 2, 3};
var res = collection.AsQueryable().Where(x => Ids.Contains(x.Id)).Select(y => y).ToList();

var Ids = new int[] { 1, 2, 3};
var res = collection.AsQueryable().Where(x => Ids.Contains(x.Id)).Select(y => y).ToList();

var filter = Builders<Post>.Filter.In(f=> f.Id, new []{ 1, 2, 3 });

// As an Async way
var res = collection.Find(filter).ToListAsync().Result;

// As a Sync way
var res = collection.Find(filter).ToList();