public PropertyMapper(Expression <Func <TModel, TProperty> > expression)
{
var member = expression.Body as MemberExpression;
if (member == null)
{
throw new InvalidOperationException("无效的属性访问表达式" + expression);
}
_member = ((MemberExpression)expression.Body).Member;
_valueReader = CellValueReader.Build <TProperty>();
_displayName = ExtraceDisplayName(_member);
_propertyMap = CreatePropertyMapAction(expression);
}
/// <summary>
/// Sets the reader of the property map to use a custom cell value reader.
/// </summary>
/// <typeparam name="T">The type of the property map.</typeparam>
/// <param name="propertyMap">The property map to use.</param>
/// <param name="reader">The custom reader to use.</param>
/// <returns>The property map on which this method was invoked.</returns>
public static T WithReader <T>(this T propertyMap, ICellValueReader reader) where T : ISinglePropertyMap
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (propertyMap.CellReader is OptionalCellValueReader optionalCellValueReader)
{
optionalCellValueReader.InnerReader = reader;
}
else
{
propertyMap.CellReader = reader;
}
return(propertyMap);
}
