Question

我想获取json反序列化对象中的键

json看起来像：

{"key1":1,"key2":2,"key3":3}

我正在使用JavaScriptSerializer：

Dim jsonStr As String = "{""key1"":1,""key2"":2,""key3"":3}"

Dim j As Object = New JavaScriptSerializer().Deserialize(Of Object)(jsonStr)

Dim jQty As Integer = j.Count 'Count key/value pairs (Return 3)

现在我想获取j中现有密钥的列表。我试过了：

Dim keys As List(Of String) = j.Properties().Select(Function(p) p.Name).ToList()

但它给了我＆＃34; System.MissingMemberException：＆＃39;公共成员＆＃39;属性＆＃39; on type＆＃39; Dictionary（Of String，Object）＆＃39;没找到。＆＃39;＆＃34;

Answer 1

默认情况下，它会反序列化为Dictionary(Of String, Object)对象，如错误消息所示。因此，您只需循环遍历字典条目列表：

For Each entry As KeyValuePair(Of String, Object) In j
    Console.WriteLine("Key = " & entry.Key)
    Console.WriteLine("Value = " & entry.Value)
Next

或者，如果您只需要密钥名称：

j.Select(Function(entry) entry.Key)

VB.NET从json反序列化对象获取键列表

1 个答案: