無法將類型爲「System.Data.Common.DataRecordInternal」的對象強制類型爲「System.Data.IDataReader」

Question

嘗試創建this linq語句時。我遇到了以下錯誤：

Unable to cast object of type 'System.Data.Common.DataRecordInternal' to type 'System.Data.IDataReader'

這是我每@SLaks promising answer做什麼。

List<TypeData> = reader.Cast<IDataReader>() 
    .Select(dr => new TypeData { Type = (string)dr["type"] })     
    .ToList(); 

Answer 1

嘗試reader.Cast<DbDataRecord>或reader.Cast<IDataRecord>代替：

IEnumerable<TypeData> typeData = reader.Cast<IDataRecord>() 
    .Select(dr => new TypeData { Type = (string)dr["type"] }); 

IDataRecord Interface

Provides access to the column values within each row for a DataReader, and is implemented by .NET Framework data providers that access relational databases.