我使用反射来更新已对其进行更新并保存到mongodb的对象
private void updateSelf(MongoDoc newDoc)
{
Type type = this.GetType();
foreach (var i in type.GetProperties())
{
if (i.GetCustomAttributes(false).Any(x => x is MongoDB.Bson.Serialization.Attributes.BsonIgnoreAttribute)) continue;
Object oldValue = i.GetValue(this, null);
Object newValue = i.GetValue(newDoc, null);
if (!Object.Equals(oldValue, newValue) && !((oldValue == null) && (newValue == null)))
{
i.SetValue(this, newValue, null);
}
}
}
这在大多数情况下都有效,但是
i.SetValue(this, newValue, null);
在尝试更新此属性时会引发异常:public uint Revision { get; private set; }
这正在尝试更新
Product
类型的对象,该对象是MongoDoc
的派生类型,其中包含属性public uint Revision { get; private set; }
导致异常Property set Method not found
,我不确定是什么原因造成的,因为它适用于所有我的其他属性,仅此一项引发异常。任何帮助表示赞赏更新:
我试过下面的答案:
i.SetValue(this, newValue, System.Reflection.BindingFlags.SetProperty | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic, null, null, null);
但不幸的是,结果完全相同,它仍然在Revision属性上引发异常。
更新:
例外:
System.ArgumentException was unhandled
Message=Property set method not found.
Source=mscorlib
StackTrace:
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
at Flo.Client.Docs.MongoDoc.updateSelf(MongoDoc newDoc) in F:\Flo\Flo.Client\Docs\MongoDoc.cs:line 162
at Flo.Client.Docs.MongoDoc.UpdateToMongo(MongoDoc newDoc) in F:\Flo\Flo.Client\Docs\MongoDoc.cs:line 120
at Flo.Client.Docs.Product.EditProduct(String Name, Nullable`1 State) in F:\Flo\Flo.Client\Docs\Product.cs:line 89
at Flo.Client.Program.Main() in F:\Flo\Flo.Client\Program.cs:line 26
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
最佳答案
我对此进行了修复,这要归功于Dylan Meador向我提出的另一个问题,该问题使我有足够的能力来获得解决方案:
private void updateSelf(MongoDoc newDoc, Type type)
{
foreach (var i in type.GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public))
{
if (i.GetCustomAttributes(false).Any(x => x is MongoDB.Bson.Serialization.Attributes.BsonIgnoreAttribute)) continue;
Object oldValue = i.GetValue(this, null);
Object newValue = i.GetValue(newDoc, null);
if (!Object.Equals(oldValue, newValue) && !((oldValue == null) && (newValue == null)))
{
i.SetValue(this, newValue, null);
}
}
Type baseType = type.BaseType;
if (baseType != null)
{
this.updateSelf(newDoc, baseType);
}
}
看起来需要将Type显式设置为基类类型,才能将set访问器用于该特定属性。
关于c# - C#反射SetValue()找不到集合访问器,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12431869/