CODEWITHSUNDEEP
c#deserialization
TerribleDog
TerribleDog

Reputation: 1247

How to fix this error in Deserialization?

An unhandled exception of type 'System.InvalidCastException' occurred in sCreator.exe Additional information: Unable to cast object of type 'System.String' to type 'sCreator.Shape'.

Here's the code:

    public void Deseriaize(StreamReader file)
    {
        XmlSerializer ser = new XmlSerializer(typeof(string));
        Shape s = (Shape)ser.Deserialize(file);
        file.Close();
        MessageBox.Show(s.title);
    }

    private void btn_OpenProject_Click(object sender, EventArgs e)
    {
        StreamReader file = new StreamReader(@"C:\Users\pb8n0053\Documents\SerializationOverview.seal");
        Deseriaize(file);
    }

Shape Class

 [Serializable]
public class Shape
{
    //Properties
    public Draw draw;
    public String title;
    public float width { get; set; }
    public float height { get; set; }
    public float x { get; set; }
    public float y { get; set; }
    public static PointF center = new PointF(250f, 250f);
    public int strokeThickness { get; set; }
    public Color color { get; set; }
    public float userDefinedWidth { get; set; }
    public float userDefinedHeight { get; set; }
    public int userDefinedStroke { get; set; }
    public SizeF size;
    public PointF location;
    public float radius;
    public ShapeType type;
    public Status status;
    public enum ShapeType
    {
        rectangle, square, circle, ellipse, triangle, image
    }
    public enum Status
    {
        editing, start
    }
}

Upvotes: 0

Views: 2557

Answers (1)

laptou
laptou

Reputation: 7039

Your XmlSerializer is being created with typeof(string) as the argument to the constructor. This means that that serializer is intended to convert XML to and from a System.String. If you want it to convert your XML to and from your Shape type, then initialize it using that instead:

public void Deseriaize(StreamReader file)
{
    XmlSerializer ser = new XmlSerializer(typeof(Shape));
    Shape s = (Shape)ser.Deserialize(file);
    file.Close();
    MessageBox.Show(s.title);
}

Note that your serialization/deserialization cycle will probably fail or work incorrectly if you try to deserialize XML that was not created with XmlSerializer or if your Shape class does not properly implement ISerializable.

Upvotes: 3

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