[英]is it possible to get a property by its value in c#
I have this code where I compare the values of oldState object by the currentState in fluent inhibernate, what I want is to log the property that has been changed and its value,here I get the new and the old values but I waant also to get the property name. 我有这段代码,我在流利的休眠状态下通过currentState比较oldState对象的值,我想要的是记录已更改的属性及其值,在这里我得到了新的和旧的值,但我也想得到属性名称。
if I reflect @event.Entity
I can get all the properties and their values so is there any way to get the property name by its value. 如果我反映
@event.Entity
,则可以获取所有属性及其值,因此有任何方法可以通过其值获取属性名称。
public void OnPostUpdate(NHibernate.Event.PostUpdateEvent @event)
{
var entityToAudit = @event.Entity as IAuditable;
string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "AuditLog.txt");
using (StreamWriter sw = File.AppendText(path))
{
for (int i = 0; i < @event.OldState.Length; i++)
{
if (@event.OldState[i] != null)
{
if (!@event.OldState[i].Equals(@event.State[i]))
{
sw.WriteLine("the value has ben changed from " + @event.OldState[i] + " to " + @event.State[i]);
}
}
else
{
if (@event.State[i] != null)
{
sw.WriteLine("the value has ben changed from being empty to " + @event.State[i]);
}
}
}
}
}
You don't need to use System.Reflection
for that. 您不需要为此使用
System.Reflection
。 PostUpdateEvent
already contains all the property names in the order you need : PostUpdateEvent
已经按您需要的顺序包含了所有属性名称:
var propertyName = e.Persister.PropertyNames[i];
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