I have an application in C# to display information from Active Directory using PowerShell.
class userps
{
public string Name { get; set; }
public bool Enabled { get; set; }
}
PSObject[] results = pipeline.Invoke().ToArray();
List<userps> listUserps = new List<userps>();
foreach (PSObject obj in results)
{
lista = JsonConvert.DeserializeObject<List<userps>>(obj.ToString());
}
If the object returns data of at least two elements, for example:
[
{
"Name":"xxx",
"Enabled":true
},
{
"Name":"yyy",
"Enabled":true
}
]
Then everything is fine, List.Count = 2 . If, however, it returns one element:
[
{
"Name":"xxx",
"Enabled":true
}
]
Then List.Count = 0 and there is an exception:
Newtonsoft.Json.JsonSerializationException: „Cannot deserialize the current JSON object (eg {"name":"value"}) into type 'System.Collections.Generic.List`1[ConsoleApp1.userps]' because the type requires a JSON array (eg [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (eg [1,2,3]) or change the deserialized type so that it is a normal .NET type (eg not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object.
JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.
Path 'Name', line 2, position 11.”
How do I solve this problem so it would work for one element and also for several?
It looks like the object you get from your PowerShell command is not a collection and is serialized as an object in JSON. It's the common behaviour of PowerShell when a command returns only one object instead of a list.
Example:
Get-Service | ConvertTo-Json
[
{
"Name": "AdobeFlashPlayerUpdateSvc",
...
},
{
"Name": "ALG",
...
},
...
]
Get-Service -Name 'NetLogon' | ConvertTo-Json
{
"Name": "NetLogon",
...
}
To avoid this, encapsulate your command in an array constructor and replace the pipe by the InputObject parameter:
ConvertTo-Json -InputObject @(Get-Service -Name 'NetLogon')
[
{
"Name": "NetLogon",
...
}
]
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