[英]Set property value of nullable datetime
Try to update a specific property of my model with Reflection. 尝试使用Reflection更新模型的特定属性。 This works for all other types of my model except properties of type DateTime?
这适用于我的模型的所有其他类型,除了DateTime类型的属性?
Code: 码:
public void UpdateProperty(Guid topicGuid, string property, string value)
{
var topic = Read(topicGuid);
PropertyInfo propertyInfo = topic.GetType().GetProperty(property);
propertyInfo.SetValue(topic, Convert.ChangeType(value, propertyInfo.PropertyType), null);
topic.DateModified = DateTime.Now;
Save();
}
The following error is thrown on the Convert.ChangeType part: Convert.ChangeType部分抛出以下错误:
Invalid cast from 'System.String' to 'System.Nullable`1[[System.DateTime, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]'
How can this be solved? 怎么解决这个问题?
Update 更新
Got it working with Daniel A. White 's solution 得到了Daniel A. White的解决方案
Code updated (probably needs some finetuning, but it works): 代码更新(可能需要一些微调,但它的工作原理):
public void UpdateProperty(Guid topicGuid, string property, string value)
{
var topic = Read(topicGuid);
PropertyInfo propertyInfo = topic.GetType().GetProperty(property);
object changedType = propertyInfo.PropertyType == typeof(DateTime) || propertyInfo.PropertyType == typeof(DateTime?)
? DateTime.Parse(value)
: Convert.ChangeType(value, propertyInfo.PropertyType);
propertyInfo.SetValue(topic, changedType, null);
topic.DateModified = DateTime.Now;
Save();
}
Try to replace 尝试更换
Convert.ChangeType(value, propertyInfo.PropertyType)
by 通过
Convert.ChangeType(value, Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType)
(Not tested) (未测试)
尝试将值转换为DateTime:DateTime.Parse(value);
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