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hi, help me !!!

See original GitHub issue

some time i use linq2db

Mapping of column Name value failed, see inner exception for details | Input string was not in a correct format.   
   at LinqToDB.Expressions.ConvertFromDataReaderExpression.ColumnReader.GetValue(IDataReader dataReader)
   at lambda_method(Closure , IQueryRunner , IDataReader )
   at LinqToDB.Linq.QueryRunner.Mapper`1.Map(IQueryRunner queryRunner, IDataReader dataReader)
   at LinqToDB.Linq.QueryRunner.<ExecuteQuery>d__9`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

Environment details

linq2db version: 2.6.2 Database Server: sql server 2017

Framework version: .NET Framework 4.6.2

Issue Analytics

State:
Created 5 years ago
Comments:19 (10 by maintainers)

Top GitHub Comments

1reaction

sdanylivcommented, Jan 11, 2019

As a quick workaround i suggest to rewrite your query in more effective way:

clientId = db.ClientIds
    .Where(r => r.Key == key && r.IsActive == true)
    .Select(r => (int?)r.Id)
    .FirstOrDefault();

1reaction

sdanylivcommented, Jan 11, 2019

I see, will try to reproduce.

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