What is the deserialization error in c#?

Question

C++ / C#

Good afternoon! There is this piece of code

Hashtable ht = (Hashtable)this.serializer.Deserialize(this.labelServices.Text);
labelServices.Text = (string)ht["0".ToString()];

The PHP Serializer library is connected, in the old project it works great with the same piece, but here it gives an error that it cannot cast the ArrayList object type to Hastable.
Here is such a simple array a:2:{i:0;s:1:"1";i:1;s:1:"2";}
. The most interesting thing is that the utility that is included in the library by default cannot also deserialize it with the same problem. Can anyone suggest a solution?

Answer 1

The problem is solved, it was necessary to do deserialization in ArrayList at once and that's it, do not use HashTable.