/// <summary>
/// Gets property expression for some property in type. If property type is Enum or DateTime will be converted to string.
/// It could looks like:
/// c.SomeString, Convert.ToString(c.SomeDate, polishCulture), EnumHelper.GetDisplayName(typeof(SomeEnum), c.SomeEnum)
/// </summary>
/// <param name="propertyInfo">Reflection information about property in type.</param>
/// <param name="sourceObjectParameter">Type parameter required for property expression.</param>
/// <returns>Property expression for requested property.</returns>
private static Expression GetPropertyExpressionForProperty(PropertyInfo propertyInfo, ParameterExpression sourceObjectParameter)
{
Expression propertyExpression = null;
if (propertyInfo == null)
{
propertyExpression = Expression.Constant(null);
}
else
{
propertyExpression = Expression.Property(sourceObjectParameter, propertyInfo);
var propertyType = propertyInfo.PropertyType.GetRealType();
if (propertyType.IsEnum)
{
// Calling EnumHelper.GetDisplayName(Type enumType, object enumValue)
var propertyTypeExpression = Expression.Constant(propertyType);
var enumValueExpression = Expression.Convert(propertyExpression, typeof(object));
propertyExpression = Expression.Call(getEnumDisplayNameMethodInfo, propertyTypeExpression, enumValueExpression);
}
else if (propertyType.IsValueType)
{
// Calling Convert.ToString(property type, IFormatProvider)
var methodParmetersTypes = new[] { propertyType, typeof(IFormatProvider) };
MethodInfo convertToStringMethod = typeof(Convert).GetMethod("ToString", methodParmetersTypes);
var cultureInfo = CultureInfoHelper.GetCultureInfoForType(propertyType);
var cultureExpression = Expression.Constant(cultureInfo);
propertyExpression = Expression.Call(convertToStringMethod, propertyExpression, cultureExpression);
}
}
return(propertyExpression);
}
private static object GetValue(Type propertyType, string valueAsString)
{
var realType = propertyType.GetRealType();
if (realType.IsEnum)
{
return(Enum.Parse(realType, valueAsString));
}
var cultureInfo = CultureInfoHelper.GetCultureInfoForType(realType);
return(Convert.ChangeType(valueAsString, propertyType, cultureInfo));
}
