我决定提出另一个答案,它实际上是对 Alex 提供的答案的扩展(所以所有的功劳都归于他),但是为了 column-name-2-property-name 映射,它引入了属性。
首先需要自定义属性来保存列名:
[AttributeUsage(AttributeTargets.Property, Inherited = true)]
[Serializable]
public class MappingAttribute : Attribute
{
public string ColumnName = null;
}
该属性必须应用于要从数据库行填充的类的那些属性:
public class Product
{
[Mapping(ColumnName = "product_id")]
public int ProductId { get; private set; }
[Mapping(ColumnName = "supplier_id")]
public int SupplierId { get; private set; }
[Mapping(ColumnName = "name")]
public string Name { get; private set; }
[Mapping(ColumnName = "price")]
public decimal Price { get; private set; }
[Mapping(ColumnName = "total_stock")]
public int Stock { get; private set; }
[Mapping(ColumnName = "pending_stock")]
public int PendingStock { get; private set; }
}
其余的都按照 Alex 的建议进行,只是该属性用于检索列名:
T MapToClass<T>(SqlDataReader reader) where T : class
{
T returnedObject = Activator.CreateInstance<T>();
PropertyInfo[] modelProperties = returnedObject.GetType().GetProperties();
for (int i = 0; i < modelProperties.Length; i++)
{
MappingAttribute[] attributes = modelProperties[i].GetCustomAttributes<MappingAttribute>(true).ToArray();
if (attributes.Length > 0 && attributes[0].ColumnName != null)
modelProperties[i].SetValue(returnedObject, Convert.ChangeType(reader[attributes[0].ColumnName], modelProperties[i].PropertyType), null);
}
return returnedObject;
}