/// <summary>
/// Converts the given object to another type. The most common types to convert
/// are to and from a string object. The default implementation will make a call
/// to ToString on the object if the object is valid and if the destination
/// type is string. If this cannot convert to the destination type, this will
/// throw a NotSupportedException.
/// </summary>
public override object?ConvertTo(ITypeDescriptorContext?context, CultureInfo?culture, object?value, Type destinationType)
{
ArgumentNullException.ThrowIfNull(destinationType);
if (destinationType == typeof(InstanceDescriptor) && value is Constraint)
{
if (value is UniqueConstraint)
{
UniqueConstraint constr = (UniqueConstraint)value;
Reflection.ConstructorInfo ctor = typeof(UniqueConstraint).GetConstructor(new Type[] { typeof(string), typeof(string[]), typeof(bool) }) !;
if (ctor != null)
{
return(new InstanceDescriptor(ctor, new object[] { constr.ConstraintName, constr.ColumnNames, constr.IsPrimaryKey }));
}
}
else
{
ForeignKeyConstraint constr = (ForeignKeyConstraint)value;
System.Reflection.ConstructorInfo ctor =
typeof(ForeignKeyConstraint).GetConstructor(new Type[] { typeof(string), typeof(string), typeof(string[]),
typeof(string[]), typeof(AcceptRejectRule), typeof(Rule), typeof(Rule) }) !;
if (ctor != null)
{
return(new InstanceDescriptor(ctor, new object[] { constr.ConstraintName, constr.ParentKey.Table.TableName, constr.ParentColumnNames,
constr.ChildColumnNames, constr.AcceptRejectRule, constr.DeleteRule, constr.UpdateRule }));
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}
protected bool ParamsMatchConstructor(Reflection.ConstructorInfo constructor, object[] parameters)
{
bool matchingResult = true;
if (parameters.Length != constructor.Arguments.Length)
{
return(false);
}
for (int i = 0; i < parameters.Length && matchingResult; ++i)
{
matchingResult &=
constructor.Arguments[i].Type.IsAssignableFrom(
parameters[i].GetType());
}
return(matchingResult);
}
protected bool TryMatchConstructorWithParams(Reflection.ConstructorInfo[] constructors, object[] parameters, out Reflection.ConstructorInfo foundedConstructor)
{
foreach (var constructor in constructors)
{
if (ParamsMatchConstructor(constructor, parameters))
{
foundedConstructor = constructor;
return(true);
}
}
foundedConstructor = null;
return(false);
}
