Question

我在vb.net开发

Dim dtDetails As DataTable = Utility.GetDetailsTable()
Dim resource_id As String = ""

Dim dtrow = dtDetails.Select("id='" & user_id & "'")
If dtrow.Length > 0 Then
    For i As Integer = 0 To dtrow.Length - 1
       If i > 0 Then
          resource_id += ","
       End If
       resource_id += Convert.ToString(dtrow(i)("instance_id"))
    Next

但是当我进一步使用resource_id时，它不起作用，Docs返回为空

Dim resource_ids = New BsonValue() {resource_id}
Dim querys = Query.And(
    Query.EQ("user_id", user_id),
    Query.In("resource_id", resource_ids)
)

Dim Docs = ceilometer.GetCollection("meter").Find(querys)

因为我需要这种格式BsonValue(){"resource_id1","resource_id2"}。请帮我解决这个问题

Answer 1

从我理解你的问题的方式来看，我认为你需要将动态ID添加到BsonValue数组中。使用此answer的扩展程序：

<Extension()> _
Public Sub Add(Of T)(ByRef arr As T(), item As T)
    Array.Resize(arr, arr.Length + 1)
    arr(arr.Length - 1) = item
End Sub

然后您可以在代码中使用：

Dim dtDetails As DataTable = Utility.GetDetailsTable()
Dim resource_ids As new BsonArray

Dim dtrow = dtDetails.Select("id='" & user_id & "'")
If dtrow.Length > 0 Then
    For i As Integer = 0 To dtrow.Length - 1
       resource_ids.Add(Convert.ToString(dtrow(i)("instance_id")))
    Next
End If

Dim queries = Query.And(
    Query.EQ("user_id", user_id),
    Query.In("resource_id", resource_ids)
)

Dim Docs = ceilometer.GetCollection("meter").Find(queries)

使用双引号作为字符串

1 个答案: