我有下面的代码:我如何将动态字典值转换为列表?
List<Type> p1 = new List<Type>();
p1.Add(typeof(int));
p1.Add(typeof(string));
dynamic genericDic = typeof(Dictionary<, >);
dynamic specificDic1 = genericDic.MakeGenericType(p1.ToArray());
dynamic dic1 = Activator.CreateInstance(specificDic1);
dic1.Add(1, "John");
dic1.Add(2, "Smith");
dynamic genericLst = typeof(List<>);
dynamic specificLst = genericLst.MakeGenericType(typeof(string));
dynamic list = Activator.CreateInstance(specificLst);
list.AddRange(dic1.Values.ToList());
当我尝试执行list.AddRange(dic1.Values.ToList());
我得到下面的异常
公共成员“ToList”上键入'ValueCollection找不到。
堆栈跟踪:
at Microsoft.VisualBasic.CompilerServices.Symbols.Container.GetMembers(String& MemberName, Boolean ReportErrors)
at Microsoft.VisualBasic.CompilerServices.NewLateBinding.ObjectLateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack)
at Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack)
at StyleResearch.DataManagement.DataStream.Business.MonthEndProcess.ConverToLegacyStructureInMemory(List`1 marketDataTypeIds, String tableName, Int32 placeHolderValue) in C:\Style Research\Work\SRDM\trunk\StyleResearch.DataManagement.DataStream.Business\MonthEndProcess.vb:line 1850
at StyleResearch.DataManagement.DataStream.UI.DDLMonthEndProcess._Lambda$__6(LegacyStructureDetail legacy) in C:\Style Research\Work\SRDM\trunk\StyleResearch.DataManagement.DataStream.UI\DDLMonthEndProcess.vb:line 1198
at System.Threading.Tasks.Parallel.<>c__DisplayClass2d`2.<ForEachWorker>b__23(Int32 i)
at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()
注:我已经VB.NET样品转化成C#,但堆栈跟踪从VB.NET工程
当我做下面的工作原理精绝:
Dictionary<int, string> dic = new Dictionary<int, string>();
dic.Add(1, "John");
dic.Add(2, "Smith");
List<string> lst = new List<string>();
lst.AddRange(dic.Values.ToList());
感谢您的回复,但我确实知道这种方法。想知道为什么它会失败时,我使用反射创建对象,而不是正常进行时。 – Rajesh 2012-07-05 10:44:18
正如我所说的那样,因为动态类型和扩展方法(ToList)。动态不支持扩展方法(http://stackoverflow.com/questions/5311465/extension-method-and-dynamic-object-in-c-sharp) – Nikolay 2012-07-05 10:46:39