Reflection with array

[Wernfried Schwenkner]

I want to deserialize a file. In one ofe my classes I have an array
like:

public class MyClass
{
public MyArray[] theArray;
}

i.e. an arry of an own defined class. While reading the file I only know
the dimension on the end of reading, so I keep the array elements in an
ArrayList "records". At the end I "only" have to assign the ArrayList to
the Array-field "theArray". And there is my problem.

arrayField.FieldType shows "MyArray[]", this is correct for me. If I try
with

arrayField.SetValue(records.ToArray(), instanceOfMyClass);

to assign the Array I get the error message that the objecttype can't be
converted to the destination type.
That's right, the object type is "object[]" and the destination type is
"MyArray[]".

How can I do the typecast at runtime?
Or is there another way to do this?

 

[Stoitcho Goutsev \(100\) [C# MVP]]

Hi Wernfried,

Before digging more deeply into this.

Are you sure that the invalid cast is because of the arrays

arrayField.SetValue(records.ToArray(), instanceOfMyClass);

AFIK in FiledInfo.SetValue first comes the object which field you set and
then the value of the field. So I believe you should switch the paramers

arrayField.SetValue(instanceOfMyClass, records.ToArray());

Try that and tell if the probles is still there

--
HTH
Stoitcho Goutsev (100) [C# MVP]

I want to deserialize a file. In one ofe my classes I have an array
like:

public class MyClass
{
public MyArray[] theArray;
}

i.e. an arry of an own defined class. While reading the file I only know
the dimension on the end of reading, so I keep the array elements in an
ArrayList "records". At the end I "only" have to assign the ArrayList to
the Array-field "theArray". And there is my problem.

arrayField.FieldType shows "MyArray[]", this is correct for me. If I try
with

arrayField.SetValue(records.ToArray(), instanceOfMyClass);

to assign the Array I get the error message that the objecttype can't be
converted to the destination type.
That's right, the object type is "object[]" and the destination type is
"MyArray[]".

How can I do the typecast at runtime?
Or is there another way to do this?

 

[Wernfried Schwenkner]

arrayField.SetValue(instanceOfMyClass, records.ToArray());

Try that and tell if the probles is still there

Thanks. This was the problem. I certainly got confused with my variabale
names and missed the order.