The requested page is not available for the requested platform. You are viewing the content for .NET Framework 4.5.2+ platform.

ValueConverter.ConvertFromStorageType(Object) Method

When overridden in a derived class, converts the value which is stored in a data store to the persistent property's value.

Namespace: DevExpress.Xpo.Metadata

Assembly: DevExpress.Xpo.v19.1.dll

Declaration

public abstract object ConvertFromStorageType(object value)
Public MustOverride Function ConvertFromStorageType(value As Object) As Object
public abstract object ConvertFromStorageType(object value)
Public MustOverride Function ConvertFromStorageType(value As Object) As Object

Parameters

Name Type Description
value Object

An object which represents the value to convert.

Parameters

Name Type Description
value Object

An object which represents the value to convert.

Returns

Type Description
Object

An object which represents the converted value.

Returns

Type Description
Object

An object which represents the converted value.

Examples

The following code example demonstrates how to store your boolean data in the database using the "T" string for true and "F" for false by defining a new ValueConverter descendant. You may need this converter when using an existing database in which boolean properties are stored such form.

//...       
[Size(1), ValueConverter(typeof(BooleanToStringValueConverter))]
public bool Answer {
    get { return GetPropertyValue<bool>("Answer"); }
    set { SetPropertyValue<bool>("Answer", value); }
}

//...
public class BooleanToStringValueConverter : ValueConverter {
    public override object ConvertFromStorageType(object value) {
        return Convert.ToString(value) == "T";
    }
    public override object ConvertToStorageType(object value) {
        return Convert.ToBoolean(value) ? "T" : "F";
    }
    public override System.Type StorageType {
        get { return typeof(string); }
    }
}
See Also