Question

我已经看到了一个使用entiyt框架的示例，它起诉ApplyPropertyChanges方法来更新实体。在普通的旧Linq-To-SQL中是否存在等效方法？

我的应用程序是一个asp.net MVC应用程序，当我运行我的编辑操作时，我想只是调用sometihng：

originalObject = GetObject(id);
DataContext.ApplyPropertyChanges(originalObject, updatedObject);
DataContext.SubmitChanges();

Answer 1

此方法应该满足您的要求：

public static void Apply<T>(T originalValuesObj, T newValuesObj, params string[] ignore)
    where T : class
{
    // check for null arguments
    if (originalValuesObj == null || newValuesObj == null)
    {
        throw new ArgumentNullException(originalValuesObj == null ? "from" : "to");
    }

    // working variable(s)
    Type type = typeof(T);
    List<string> ignoreList = new List<string>(ignore ?? new string[] { });

    // iterate through each of the properties on the object
    foreach (PropertyInfo pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
    {
        // check whether we should be ignoring this property
        if (ignoreList.Contains(pi.Name))
        {
            continue;
        }

        // set the value in the original object
        object toValue = type.GetProperty(pi.Name).GetValue(newValuesObj, null);
        type.GetProperty(pi.Name).SetValue(originalValuesObj, toValue, null);
    }

    return;
}

Answer 2

var theObject = (from table in dataContext.TheTable
                 where table.Id == theId
                 select table).Single();

theObject.Property = "New Value";
dataContext.SubmitChanges();

您可以尝试使用Attach方法，但它有问题。请参阅此链接作为参考：LINQ to SQL Update

是否有带有datacontext的ApplyPropertyChanges？

2 个答案: