Static variables are non serlizable by default – A Common problem in BizTalk solutions

Below error appears on restart of host instance manually or due to the automatic restart of host instance due to DTC issue (Also know as Host instance recovering its state due to network issues or crashing of instances)

Shape name: ShapeName
ShapeId: d0e0ca4a-cd4b-44d2-a662-526f65665ad5
Exception thrown from: segment 1, progress 37
Inner exception: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

OR

Object reference not set an instance of an object.

Problem: Static variable are not serlizable. This is the standard problem in BizTalk solution where static variables are used within class libraries..

Solution:

With Serialization, we can only serialize properties that are:

• Public
• Not static
• Not read Only

In this case, if you want to serialize by adding new variable “no1_Serialize“, you must wrap it, like this:

[Serializable]
public class Numbers
{
    public int no;
    public static int no1;
    public SubNumbers SubNumber;

    public int no1_Serialize {get {return no1;} set {no1 = value;} }
}

Ref: https://stackoverflow.com/questions/17222900/serialize-object-along-with-static-member-variables-to-xml