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System.InvalidCastException: 对象必须实现 IConvertible。

在 System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)

在 System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType);将参数值从 List`1 转换到 String 失败。;System.Object CoerceValue(System.Object, System.Data.SqlClient.MetaType); 在 System.Data.SqlClient.SqlParameter.CoerceValue(Object value, MetaType destinationType)

在 System.Data.SqlClient.SqlParameter.GetCoercedValue()

在 System.Data.SqlClient.SqlParameter.Validate(Int32 index, Boolean isCommandProc)

在 System.Data.SqlClient.SqlCommand.BuildParamList(TdsParser parser, SqlParameterCollection parameters)

在 System.Data.SqlClient.SqlCommand.BuildExecuteSql(CommandBehavior behavior, String commandText, SqlParameterCollection parameters, _SqlRPC& rpc)

在 System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)

在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)

在 System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)

在 System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)

在 System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)

在 System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)

在 System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

在 System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

在 System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)

在 DotMaysWind.Data.Helper.DataSetHelper.InternalCreateDataSet(DbProviderFactory dbProvider, DbCommand dbCommand, String[] tableNames)

在 DotMaysWind.Data.Helper.DataSetHelper.InternalCreateDataSet(DbProviderFactory dbProvider, DbCommand dbCommand)

在 DotMaysWind.Data.AbstractDatabase.ExecuteDataSet(DbCommand dbCommand, DbConnection connection, DbTransaction transaction)

在 DotMaysWind.Data.AbstractDatabase.ExecuteDataTable(DbCommand dbCommand, DbConnection connection, DbTransaction transaction)

在 DotMaysWind.Data.AbstractDatabase.ExecuteDataTable(ISqlCommand command)

在 DotMaysWind.Data.Orm.SelectCommandExtension.ToEntityList[T](SelectCommand cmd, AbstractDatabaseTable`1 table)

Hi,

When trying to insert large text (with length about 90000 or above) the field contain an empty string, the field type is ntext. Anyone know the problem please help me. Thanks a lot.